diff --git a/.eslintrc.js b/.eslintrc.cjs
similarity index 94%
rename from .eslintrc.js
rename to .eslintrc.cjs
index e798383f20..c299bfbdd1 100644
--- a/.eslintrc.js
+++ b/.eslintrc.cjs
@@ -1,5 +1,6 @@
 const pluginPresets = {
   'array-func': `all`,
+  import: `recommended`,
   jsdoc: `recommended`,
   markdown: `recommended`,
   nuxt: `recommended`,
@@ -77,6 +78,14 @@ const enabledRuleParameters = {
   'spaced-comment': [`always`],
   'template-curly-spacing': [],
 
+  // eslint-plugin-import
+  'import/extensions': [`ignorePackages`],
+  'import/no-commonjs': [{ allowConditionalRequire: false }],
+  'import/no-dynamic-require': [],
+  'import/no-unresolved': [{
+    ignore: [`^fs/promises$`],
+  }],
+
   // eslint-plugin-jsdoc
   'jsdoc/check-alignment': [],
   'jsdoc/check-indentation': [],
@@ -225,6 +234,7 @@ const warnRules = new Set([
 
 const disabledRules = [
   `no-console`,
+  `import/no-duplicates`,
   `jsdoc/newline-after-description`,
   `jsdoc/no-undefined-types`,
   `jsdoc/require-description`,
@@ -241,7 +251,6 @@ const disabledRules = [
   `unicorn/no-array-reduce`,
   `unicorn/no-useless-undefined`,
   `unicorn/prefer-node-protocol`,
-  `unicorn/prefer-module`,
   `unicorn/prefer-spread`,
   `vue/multiline-html-element-content-newline`,
   `vue/singleline-html-element-content-newline`,
@@ -308,6 +317,16 @@ module.exports = {
         'jsdoc/require-jsdoc': `off`,
       },
     },
+    {
+      files: [`**/*.cjs`, `server/**.js`],
+      parserOptions: {
+        sourceType: `script`,
+      },
+      rules: {
+        'import/no-commonjs': `off`,
+        'unicorn/prefer-module': `off`,
+      },
+    },
     {
       files: [`**/*.vue`],
     },
diff --git a/cli/build-plugin-data.js b/cli/build-plugin-data.js
index 89819f7381..c3cc99224e 100755
--- a/cli/build-plugin-data.js
+++ b/cli/build-plugin-data.js
@@ -1,13 +1,10 @@
 #!/usr/bin/env node
 
-const path = require(`path`);
-const {
-  readdir,
-  stat,
-  writeFile,
-} = require(`fs/promises`);
-const chalk = require(`chalk`);
-const importJson = require(`../lib/import-json.js`);
+import path from 'path';
+import { fileURLToPath } from 'url';
+import { readdir, writeFile } from 'fs/promises';
+import chalk from 'chalk';
+import importJson from '../lib/import-json.js';
 
 const plugins = {
   importPlugins: [],
@@ -17,10 +14,10 @@ const plugins = {
 
 const allPreviousVersions = {};
 
-const pluginDirectory = path.join(__dirname, `../plugins/`);
+const pluginDirectoryUrl = new URL(`../plugins/`, import.meta.url);
 
 (async () => {
-  const directoryEntries = await readdir(pluginDirectory, { withFileTypes: true });
+  const directoryEntries = await readdir(pluginDirectoryUrl, { withFileTypes: true });
   const pluginKeys = directoryEntries.filter(entry => entry.isDirectory()).map(entry => entry.name);
 
   for (const pluginKey of pluginKeys) {
@@ -46,11 +43,11 @@ const pluginDirectory = path.join(__dirname, `../plugins/`);
     Object.keys(plugins.data).sort().map(key => [key, plugins.data[key]]),
   );
 
-  const filename = path.join(pluginDirectory, `plugins.json`);
+  const filePath = fileURLToPath(new URL(`plugins.json`, pluginDirectoryUrl));
 
   try {
-    await writeFile(filename, `${JSON.stringify(plugins, null, 2)}\n`, `utf8`);
-    console.log(chalk.green(`[Success]`), `Updated plugin data file`, filename);
+    await writeFile(filePath, `${JSON.stringify(plugins, null, 2)}\n`, `utf8`);
+    console.log(chalk.green(`[Success]`), `Updated plugin data file`, filePath);
     process.exit(0);
   }
   catch (error) {
@@ -66,7 +63,7 @@ const pluginDirectory = path.join(__dirname, `../plugins/`);
  */
 async function readPluginJson(pluginKey) {
   try {
-    const pluginJson = await importJson(`${pluginKey}/plugin.json`, pluginDirectory);
+    const pluginJson = await importJson(`${pluginKey}/plugin.json`, pluginDirectoryUrl);
     plugins.data[pluginKey].name = pluginJson.name;
 
     if (pluginJson.previousVersions) {
@@ -90,20 +87,18 @@ async function readPluginJson(pluginKey) {
  * @param {String} pluginKey The plugin key.
  */
 async function readPluginImport(pluginKey) {
-  const importPath = path.join(pluginDirectory, pluginKey, `import.js`);
   try {
-    await stat(importPath);
-    const importPlugin = require(importPath);
+    const importPlugin = await import(new URL(`${pluginKey}/import.js`, pluginDirectoryUrl));
     plugins.importPlugins.push(pluginKey);
     plugins.data[pluginKey].importPluginVersion = importPlugin.version;
   }
   catch (error) {
-    if (error.code === `ENOENT`) {
+    if (error.code === `ERR_MODULE_NOT_FOUND`) {
       // ignore non-existing file
       return;
     }
 
-    console.error(error.message);
+    console.error(`Import plugin ${pluginKey} could not be parsed:`, error.message);
     process.exit(1);
   }
 }
@@ -113,21 +108,19 @@ async function readPluginImport(pluginKey) {
  * @param {String} pluginKey The plugin key.
  */
 async function readPluginExport(pluginKey) {
-  const exportPath = path.join(pluginDirectory, pluginKey, `export.js`);
   try {
-    await stat(exportPath);
-    const exportPlugin = require(exportPath);
+    const exportPlugin = await import(new URL(`${pluginKey}/export.js`, pluginDirectoryUrl));
     plugins.exportPlugins.push(pluginKey);
     plugins.data[pluginKey].exportPluginVersion = exportPlugin.version;
     plugins.data[pluginKey].exportTests = [];
   }
   catch (error) {
-    if (error.code === `ENOENT`) {
+    if (error.code === `ERR_MODULE_NOT_FOUND`) {
       // ignore non-existing file
       return;
     }
 
-    console.error(error.message);
+    console.error(`Export plugin ${pluginKey} could not be parsed:`, error.message);
     process.exit(1);
   }
 }
@@ -137,9 +130,8 @@ async function readPluginExport(pluginKey) {
  * @param {String} pluginKey The plugin key.
  */
 async function readPluginExportTests(pluginKey) {
-  const exportTestsPath = path.join(pluginDirectory, pluginKey, `exportTests`);
   try {
-    const exportTestFiles = await readdir(exportTestsPath);
+    const exportTestFiles = await readdir(new URL(`${pluginKey}/exportTests/`, pluginDirectoryUrl));
     for (const test of exportTestFiles) {
       const testKey = path.basename(test, path.extname(test));
       plugins.data[pluginKey].exportTests.push(testKey);
@@ -151,7 +143,7 @@ async function readPluginExportTests(pluginKey) {
       return;
     }
 
-    console.error(error.message);
+    console.error(`Export tests for plugin ${pluginKey} could not be read:`, error.message);
     process.exit(1);
   }
 }
diff --git a/cli/build-register.js b/cli/build-register.js
index 0c80b1b66e..893164ee02 100755
--- a/cli/build-register.js
+++ b/cli/build-register.js
@@ -1,20 +1,21 @@
 #!/usr/bin/env node
 
-const { readdir, writeFile } = require(`fs/promises`);
-const path = require(`path`);
-const chalk = require(`chalk`);
+import { fileURLToPath } from 'url';
+import { readdir, writeFile } from 'fs/promises';
+import path from 'path';
+import chalk from 'chalk';
 
-const { Register } = require(`../lib/register.js`);
-const importJson = require(`../lib/import-json.js`);
+import { Register } from '../lib/register.js';
+import importJson from '../lib/import-json.js';
 
 let register;
 let manufacturers;
 
-const fixturesPath = path.join(__dirname, `../fixtures/`);
+const fixturesPath = fileURLToPath(new URL(`../fixtures/`, import.meta.url));
 
 (async () => {
   try {
-    manufacturers = await importJson(`../fixtures/manufacturers.json`, __dirname);
+    manufacturers = await importJson(`../fixtures/manufacturers.json`, import.meta.url);
     register = new Register(manufacturers);
 
     await addFixturesToRegister();
diff --git a/cli/build-test-fixtures.js b/cli/build-test-fixtures.js
index 6c7a9a7172..fe1bf42fd8 100755
--- a/cli/build-test-fixtures.js
+++ b/cli/build-test-fixtures.js
@@ -5,16 +5,17 @@
  * keeping the set as small as possible) and updates tests/test-fixtures.json and tests/test-fixtures.md.
  */
 
-const { readdir, writeFile } = require(`fs/promises`);
-const path = require(`path`);
-const chalk = require(`chalk`);
+import { fileURLToPath } from 'url';
+import { readdir, writeFile } from 'fs/promises';
+import path from 'path';
+import chalk from 'chalk';
 
-const { fixtureFromRepository } = require(`../lib/model.js`);
-const importJson = require(`../lib/import-json.js`);
+import { fixtureFromRepository } from '../lib/model.js';
+import importJson from '../lib/import-json.js';
 
-const fixtureFeaturesDirectory = path.join(__dirname, `../lib/fixture-features`);
-const jsonFile = path.join(__dirname, `../tests/test-fixtures.json`);
-const markdownFile = path.join(__dirname, `../tests/test-fixtures.md`);
+const fixtureFeaturesDirectoryUrl = new URL(`../lib/fixture-features/`, import.meta.url);
+const jsonPath = fileURLToPath(new URL(`../tests/test-fixtures.json`, import.meta.url));
+const markdownPath = fileURLToPath(new URL(`../tests/test-fixtures.md`, import.meta.url));
 
 /**
  * @typedef {Object} FixtureFeature
@@ -33,7 +34,7 @@ const markdownFile = path.join(__dirname, `../tests/test-fixtures.md`);
  */
 
 (async () => {
-  const register = await importJson(`../fixtures/register.json`, __dirname);
+  const register = await importJson(`../fixtures/register.json`, import.meta.url);
 
   const fixtureFeatures = await getFixtureFeatures();
   const featuresUsed = Object.fromEntries(fixtureFeatures.map(feature => [feature.id, 0]));// check which features each fixture supports
@@ -99,11 +100,11 @@ const markdownFile = path.join(__dirname, `../tests/test-fixtures.md`);
   }
 
   try {
-    await writeFile(jsonFile, `${JSON.stringify(fixtures, null, 2)}\n`, `utf8`);
-    console.log(chalk.green(`[Success]`), `Updated ${jsonFile}`);
+    await writeFile(jsonPath, `${JSON.stringify(fixtures, null, 2)}\n`, `utf8`);
+    console.log(chalk.green(`[Success]`), `Updated ${jsonPath}`);
 
-    await writeFile(markdownFile, await getMarkdownCode(fixtures, fixtureFeatures), `utf8`);
-    console.log(chalk.green(`[Success]`), `Updated ${markdownFile}`);
+    await writeFile(markdownPath, await getMarkdownCode(fixtures, fixtureFeatures), `utf8`);
+    console.log(chalk.green(`[Success]`), `Updated ${markdownPath}`);
   }
   catch (error) {
     console.error(chalk.red(`[Fail]`), `Could not write test fixtures file:`, error);
@@ -117,18 +118,19 @@ const markdownFile = path.join(__dirname, `../tests/test-fixtures.md`);
 async function getFixtureFeatures() {
   const fixtureFeatures = [];
 
-  for (const featureFile of await readdir(fixtureFeaturesDirectory)) {
-    if (path.extname(featureFile) !== `.js`) {
+  for (const fileName of await readdir(fixtureFeaturesDirectoryUrl)) {
+    if (path.extname(fileName) !== `.js`) {
       continue;
     }
 
     // module exports array of fix features
-    const fixtureFeatureFile = require(path.join(fixtureFeaturesDirectory, featureFile));
+    const fixtureFeatureFileUrl = new URL(fileName, fixtureFeaturesDirectoryUrl);
+    const { default: fixtureFeatureFile } = await import(fixtureFeatureFileUrl);
 
     for (const [index, fixtureFeature] of fixtureFeatureFile.entries()) {
       // default id
       if (!(`id` in fixtureFeature)) {
-        fixtureFeature.id = path.basename(featureFile, `.js`);
+        fixtureFeature.id = path.basename(fileName, `.js`);
         if (fixtureFeatureFile.length > 1) {
           fixtureFeature.id += `-${index}`;
         }
@@ -155,7 +157,7 @@ async function getFixtureFeatures() {
  * @returns {Promise.<String>} A Promise that resolves to the markdown code to be used in a markdown file.
  */
 async function getMarkdownCode(fixtures, fixtureFeatures) {
-  const manufacturers = await importJson(`../fixtures/manufacturers.json`, __dirname);
+  const manufacturers = await importJson(`../fixtures/manufacturers.json`, import.meta.url);
 
   const mdLines = [
     `# Test fixtures`,
diff --git a/cli/debug-env-variables.js b/cli/debug-env-variables.js
index 645a4035f3..582c1e22d8 100755
--- a/cli/debug-env-variables.js
+++ b/cli/debug-env-variables.js
@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 
-const chalk = require(`chalk`);
+import chalk from 'chalk';
 
 const usedVariables = [
   `ALLOW_SEARCH_INDEXING`,
@@ -23,10 +23,12 @@ console.log(`Process environment variables:`);
 printVariables();
 console.log();
 
-require(`../lib/load-env-file`);
-
-console.log(`Environment variables after reading .env:`);
-printVariables();
+import(`../lib/load-env-file.js`).then(() => {
+  console.log(`Environment variables after reading .env:`);
+  printVariables();
+}).catch(error => {
+  throw error;
+});
 
 /**
  * Prints all used environment variables and their values / unset
diff --git a/cli/diff-plugin-outputs.js b/cli/diff-plugin-outputs.js
index cdb94b14b4..8e7c46384a 100755
--- a/cli/diff-plugin-outputs.js
+++ b/cli/diff-plugin-outputs.js
@@ -1,15 +1,14 @@
 #!/usr/bin/env node
 
-const path = require(`path`);
-const minimist = require(`minimist`);
-const chalk = require(`chalk`);
+import minimist from 'minimist';
+import chalk from 'chalk';
 
-const diffPluginOutputs = require(`../lib/diff-plugin-outputs.js`);
-const importJson = require(`../lib/import-json.js`);
+import diffPluginOutputs from '../lib/diff-plugin-outputs.js';
+import importJson from '../lib/import-json.js';
 
 (async () => {
-  const plugins = await importJson(`../plugins/plugins.json`, __dirname);
-  const testFixtures = (await importJson(`../tests/test-fixtures.json`, __dirname)).map(
+  const plugins = await importJson(`../plugins/plugins.json`, import.meta.url);
+  const testFixtures = (await importJson(`../tests/test-fixtures.json`, import.meta.url)).map(
     fixture => `${fixture.man}/${fixture.key}`,
   );
 
@@ -23,11 +22,13 @@ const importJson = require(`../lib/import-json.js`);
   cliArguments.testFix = cliArguments[`test-fix`];
   cliArguments.fixtures = cliArguments._;
 
+  const scriptName = import.meta.url.split(`/`).slice(-2).join(`/`);
+
   const helpMessage = [
     `This script exports the given fixtures with the current version of the given plugin and diffs the results`,
     `against the files exported with the comparePlugin at the state of the given Git reference.`,
     `Fixtures have to be declared with the path to its file in the fixtures/ directory.`,
-    `Usage: node ${path.relative(process.cwd(), __filename)} -p <plugin-key> [-c <compare-plugin-key>] [-r <git-ref>] [ -t | <fixture> [<more fixtures>] ]`,
+    `Usage: node ${scriptName} -p <plugin-key> [-c <compare-plugin-key>] [-r <git-ref>] [ -t | <fixture> [<more fixtures>] ]`,
     `Options:`,
     `  --plugin,         -p: Which plugin should be used to output fixtures. Allowed values:`,
     `                        ${plugins.exportPlugins.join(`, `)}`,
diff --git a/cli/export-fixture.js b/cli/export-fixture.js
index bde5b4adf7..9edc2d7931 100755
--- a/cli/export-fixture.js
+++ b/cli/export-fixture.js
@@ -1,11 +1,12 @@
 #!/usr/bin/env node
-const { mkdir, writeFile } = require(`fs/promises`);
-const path = require(`path`);
-const minimist = require(`minimist`);
-const chalk = require(`chalk`);
+import { fileURLToPath } from 'url';
+import { mkdir, writeFile } from 'fs/promises';
+import path from 'path';
+import minimist from 'minimist';
+import chalk from 'chalk';
 
-const { fixtureFromRepository } = require(`../lib/model.js`);
-const importJson = require(`../lib/import-json.js`);
+import { fixtureFromRepository } from '../lib/model.js';
+import importJson from '../lib/import-json.js';
 
 (async () => {
   try {
@@ -19,7 +20,7 @@ const importJson = require(`../lib/import-json.js`);
 
     let fixtures;
     if (cliArguments.a) {
-      const register = await importJson(`../fixtures/register.json`, __dirname);
+      const register = await importJson(`../fixtures/register.json`, import.meta.url);
       fixtures = Object.keys(register.filesystem).filter(
         fixtureKey => !(`redirectTo` in register.filesystem[fixtureKey]) || register.filesystem[fixtureKey].reason === `SameAsDifferentBrand`,
       ).map(fixtureKey => fixtureKey.split(`/`));
@@ -36,13 +37,13 @@ const importJson = require(`../lib/import-json.js`);
 
     const outDirectory = cliArguments.o ? path.resolve(process.cwd(), cliArguments.o) : null;
 
-    const plugin = require(`../plugins/${cliArguments.plugin}/export.js`);
+    const plugin = await import(`../plugins/${cliArguments.plugin}/export.js`);
     const files = await plugin.exportFixtures(
       await Promise.all(fixtures.map(
         ([manufacturer, fixture]) => fixtureFromRepository(manufacturer, fixture),
       )),
       {
-        baseDirectory: path.join(__dirname, `..`),
+        baseDirectory: fileURLToPath(new URL(`../`, import.meta.url)),
         date: new Date(),
       },
     );
@@ -96,7 +97,7 @@ async function checkCliArguments(cliArguments) {
     process.exit(1);
   }
 
-  const plugins = await importJson(`../plugins/plugins.json`, __dirname);
+  const plugins = await importJson(`../plugins/plugins.json`, import.meta.url);
 
   if (!plugins.exportPlugins.includes(cliArguments.plugin)) {
     console.error(chalk.red(`[Error]`), `Plugin '${cliArguments.plugin}' does not exist or does not support exporting.\n\navailable plugins:`, Object.keys(plugins.exportPlugins).join(`, `));
diff --git a/cli/import-fixture.js b/cli/import-fixture.js
index 5e1d394b01..43266ee0df 100755
--- a/cli/import-fixture.js
+++ b/cli/import-fixture.js
@@ -1,12 +1,12 @@
 #!/usr/bin/env node
 
-const minimist = require(`minimist`);
-const { readFile } = require(`fs/promises`);
+import minimist from 'minimist';
+import { readFile } from 'fs/promises';
 
-const { checkFixture } = require(`../tests/fixture-valid.js`);
-const fixtureJsonStringify = require(`../lib/fixture-json-stringify.js`);
-const createPullRequest = require(`../lib/create-github-pr.js`);
-const importJson = require(`../lib/import-json.js`);
+import { checkFixture } from '../tests/fixture-valid.js';
+import fixtureJsonStringify from '../lib/fixture-json-stringify.js';
+import createPullRequest from '../lib/create-github-pr.js';
+import importJson from '../lib/import-json.js';
 
 /** @typedef {import('../lib/types.js').FixtureCreateResult} FixtureCreateResult */
 
@@ -28,7 +28,7 @@ const importJson = require(`../lib/import-json.js`);
   try {
     const buffer = await readFile(filename);
 
-    const plugin = require(`../plugins/${cliArguments.plugin}/import.js`);
+    const plugin = await import(`../plugins/${cliArguments.plugin}/import.js`);
     const { manufacturers, fixtures, warnings } = await plugin.importFixtures(buffer, filename, cliArguments[`author-name`]);
 
     /** @type {FixtureCreateResult} */
@@ -74,7 +74,7 @@ const importJson = require(`../lib/import-json.js`);
  * @param {Object.<String, *>} cliArguments Command line interface arguments parsed by minimist.
  */
 async function checkCliArguments(cliArguments) {
-  const plugins = await importJson(`../plugins/plugins.json`, __dirname);
+  const plugins = await importJson(`../plugins/plugins.json`, import.meta.url);
 
   if (cliArguments._.length !== 1 || !plugins.importPlugins.includes(cliArguments.plugin) || !cliArguments[`author-name`]) {
     console.error(`Usage: ${process.argv[1]} -p <plugin> -a <author name> [--create-pull-request] <filename>\n\navailable plugins: ${plugins.importPlugins.join(`, `)}`);
diff --git a/cli/run-export-test.js b/cli/run-export-test.js
index ff47b36ad4..e5fbd43a1e 100755
--- a/cli/run-export-test.js
+++ b/cli/run-export-test.js
@@ -1,15 +1,16 @@
 #!/usr/bin/env node
-const path = require(`path`);
-const minimist = require(`minimist`);
-const chalk = require(`chalk`);
+import path from 'path';
+import minimist from 'minimist';
+import chalk from 'chalk';
+import { fileURLToPath } from 'url';
 
-const { fixtureFromFile, fixtureFromRepository } = require(`../lib/model.js`);
-const importJson = require(`../lib/import-json.js`);
+import { fixtureFromFile, fixtureFromRepository } from '../lib/model.js';
+import importJson from '../lib/import-json.js';
 
 (async () => {
   try {
-    const plugins = await importJson(`../plugins/plugins.json`, __dirname);
-    const testFixtures = await importJson(`../tests/test-fixtures.json`, __dirname);
+    const plugins = await importJson(`../plugins/plugins.json`, import.meta.url);
+    const testFixtures = await importJson(`../tests/test-fixtures.json`, import.meta.url);
 
     const cliArguments = minimist(process.argv.slice(2), {
       string: [`p`],
@@ -17,10 +18,12 @@ const importJson = require(`../lib/import-json.js`);
       alias: { p: `plugin`, h: `help` },
     });
 
+    const scriptName = import.meta.url.split(`/`).pop();
+
     const helpMessage = [
       `Run the plugin's export tests against the specified fixtures`,
       `(or the test fixtures, if no fixtures are specified).`,
-      `Usage: node ${path.relative(process.cwd(), __filename)} -p <plugin> [ <fixtures> ]`,
+      `Usage: node ${scriptName} -p <plugin> [ <fixtures> ]`,
       `Options:`,
       `  --plugin,   -p: Key of the plugin whose export tests should be called`,
       `  --help,     -h: Show this help message.`,
@@ -52,18 +55,18 @@ const importJson = require(`../lib/import-json.js`);
       ? testFixtures.map(fixture => fixtureFromRepository(fixture.man, fixture.key))
       : cliArguments._.map(relativePath => fixtureFromFile(path.join(process.cwd(), relativePath)));
 
-    const pluginExport = require(`../plugins/${cliArguments.plugin}/export.js`);
+    const exportPlugin = await import(`../plugins/${cliArguments.plugin}/export.js`);
 
-    const files = await pluginExport.exportFixtures(
+    const files = await exportPlugin.exportFixtures(
       await Promise.all(fixtures),
       {
-        baseDirectory: path.join(__dirname, `..`),
+        baseDirectory: fileURLToPath(new URL(`../`, import.meta.url)),
         date: new Date(),
       },
     );
 
     await Promise.all(pluginData.exportTests.map(async testKey => {
-      const exportTest = require(`../plugins/${cliArguments.plugin}/exportTests/${testKey}.js`);
+      const { default: exportTest } = await import(`../plugins/${cliArguments.plugin}/exportTests/${testKey}.js`);
 
       const outputPerFile = await Promise.all(files.map(async file => {
         try {
diff --git a/docs/environment-variables.md b/docs/environment-variables.md
index 200da1e02f..61ed5c1c3b 100644
--- a/docs/environment-variables.md
+++ b/docs/environment-variables.md
@@ -9,7 +9,7 @@ MY_ENV_VARIABLE=hello
 NODE_ENV=production
 ```
 
-Every script that uses environment variables must require [`lib/load-env-file.js`](../lib/load-env-file.js) first (usually placed right after all the other `require` calls). Note that `require(...)` takes a relative path beginning with `./` or `../`.
+Every script that uses environment variables must import [`lib/load-env-file.js`](../lib/load-env-file.js) first (usually placed right after all the other `import` calls).
 
 Please update these docs and [`cli/debug-env-variables.js`](../cli/debug-env-variables.js) after introducing new variables.
 
diff --git a/docs/fixture-features.md b/docs/fixture-features.md
index 425531c1fe..336846ca76 100644
--- a/docs/fixture-features.md
+++ b/docs/fixture-features.md
@@ -10,7 +10,7 @@ We use fixture features for the following purposes:
 Fixture features are saved in the the [`lib/fixture-features/`](../lib/fixture-features/) directory as JS modules that export an array of features. It is advised to put similar features into one module. A sample module looks like this:
 
 ```js
-module.exports = [{
+export default [{
   // Optional, default is the filename (without '.js', succeeded by `-${i}` if
   // multiple features per module are provided). Must be unique!
   id: `fine-channel-alias`,
diff --git a/docs/fixture-model.md b/docs/fixture-model.md
index 9a05887a0c..a206f6ad02 100644
--- a/docs/fixture-model.md
+++ b/docs/fixture-model.md
@@ -11,7 +11,7 @@ All model classes are located in the [`lib/model/`](../lib/model) directory. Whe
 <!-- While top level `await` is not supported by ESLint, skip parsing this code block. -->
 <!-- eslint-skip -->
 ```js
-const { fixtureFromRepository } = require(`./lib/model.js`);
+import { fixtureFromRepository } from './lib/model.js';
 
 const myFixture = await fixtureFromRepository(`cameo`, `nanospot-120`); // instanceof Fixture
 
@@ -23,7 +23,7 @@ if (panFine.coarseChannel.hasHighlightValue) {
 }
 ```
 
-If you want to use a model class directly, also import it via `model.js` (like this: ``const { Meta } = require(`./lib/model.js`);``) because ES modules (`import ... from ...`, `export ...`) and CommonJS modules (`require(...)`, `module.exports = ...`) don't work together nicely; `model.js` fixes this through a polyfill.
+If you want to use a model class directly, also import it via `model.js` (like this: `import { Meta } from './lib/model.js';`).
 
 Model properties are always implemented using getters and setters. To store data, we use backing fields (an internal property prefixed with underscore, e.g. `_jsonObject`) to hold the data. The backing field should never be accessed directly, but only through its getter and setter functions (without underscore).
 
diff --git a/docs/plugins.md b/docs/plugins.md
index 776485691a..bf855786b1 100644
--- a/docs/plugins.md
+++ b/docs/plugins.md
@@ -35,17 +35,17 @@ If exporting is supported, create a `plugins/<plugin-key>/export.js` module that
 A very simple export plugin looks like this:
 
 ```js
-module.exports.version = `0.1.0`; // semantic versioning of export plugin
+export const version = `0.1.0`; // semantic versioning of export plugin
 
 /**
  * @param {Array.<Fixture>} fixtures An array of Fixture objects, see our fixture model
  * @param {Object} options Some global options, for example:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} All generated files (see file schema above)
  */
-module.exports.exportFixtures = async function exportPluginName(fixtures, options) {
+export async function exportFixtures(fixtures, options) {
   const outfiles = [];
 
   for (const fixture of fixtures) {
@@ -62,7 +62,7 @@ module.exports.exportFixtures = async function exportPluginName(fixtures, option
   }
 
   return outfiles;
-};
+}
 ```
 
 ## Importing
@@ -92,7 +92,7 @@ If the file can not be parsed by the import plugin or contains errors, the retur
 Example:
 
 ```js
-module.exports.version = `0.1.0`; // semantic versioning of import plugin
+export const version = `0.1.0`; // semantic versioning of import plugin
 
 /**
  * @param {Buffer} buffer The imported file.
@@ -100,7 +100,7 @@ module.exports.version = `0.1.0`; // semantic versioning of import plugin
  * @param {String} authorName The importer's name.
  * @returns {Promise.<Object, Error>} A Promise that resolves to an out object (see above) or rejects with an error.
  */
-module.exports.importFixtures = async function importPluginName(buffer, fileName, authorName) {
+export async function importFixtures(buffer, fileName, authorName) {
   const out = {
     manufacturers: {},
     fixtures: {},
@@ -129,7 +129,7 @@ module.exports.importFixtures = async function importPluginName(buffer, fileName
   out.fixtures[`${manufacturerKey}/${fixtureKey}`] = fixtureObject;
 
   return out;
-};
+}
 ```
 
 ## Export tests
@@ -141,7 +141,7 @@ A plugin's export test takes an exported file object as argument and evaluates i
 Each test module should be located at `plugins/<plugin-key>/exportTests/<export-test-key>.js`. Here's a dummy test illustrating the structure:
 
 ```js
-const xml2js = require(`xml2js`);
+import xml2js from 'xml2js';
 
 /**
  * @param {Object} exportFile The file returned by the plugins' export module.
@@ -152,7 +152,7 @@ const xml2js = require(`xml2js`);
  * @param {String|null} exportFile.mode Mode's shortName if given file only describes a single mode.
  * @returns {Promise.<undefined, Array.<String>|String>} Resolve when the test passes or reject with an array of errors or one error if the test fails.
  */
-module.exports = async function testValueCorrectness(exportFile) {
+export default async function testValueCorrectness(exportFile) {
   const xml = await xml2js.parseStringPromise(exportFile.content);
 
   const errors = [];
@@ -168,7 +168,7 @@ module.exports = async function testValueCorrectness(exportFile) {
   }
 
   // everything's ok
-};
+}
 ```
 
 You can execute an export test from the command line:
diff --git a/lib/ajv-validator.js b/lib/ajv-validator.js
index 2805abbc53..51eab39aea 100644
--- a/lib/ajv-validator.js
+++ b/lib/ajv-validator.js
@@ -1,9 +1,9 @@
-const Ajv = require(`ajv`);
-const addFormats = require(`ajv-formats`);
+import Ajv from 'ajv';
+import addFormats from 'ajv-formats';
 
 /** @typedef {import('ajv').ValidateFunction} ValidateFunction */
 
-const importJson = require(`./import-json.js`);
+import importJson from './import-json.js';
 
 const ajv = new Ajv({
   verbose: true,
@@ -15,16 +15,16 @@ ajv.addKeyword(`version`);
 ajv.addFormat(`color-hex`, true);
 
 const loadSchemasPromise = Promise.all([
-  importJson(`../schemas/capability.json`, __dirname),
-  importJson(`../schemas/channel.json`, __dirname),
-  importJson(`../schemas/definitions.json`, __dirname),
-  importJson(`../schemas/fixture-redirect.json`, __dirname),
-  importJson(`../schemas/fixture.json`, __dirname),
-  importJson(`../schemas/gobo.json`, __dirname),
-  importJson(`../schemas/manufacturers.json`, __dirname),
-  importJson(`../schemas/matrix.json`, __dirname),
-  importJson(`../schemas/plugin.json`, __dirname),
-  importJson(`../schemas/wheel-slot.json`, __dirname),
+  importJson(`../schemas/capability.json`, import.meta.url),
+  importJson(`../schemas/channel.json`, import.meta.url),
+  importJson(`../schemas/definitions.json`, import.meta.url),
+  importJson(`../schemas/fixture-redirect.json`, import.meta.url),
+  importJson(`../schemas/fixture.json`, import.meta.url),
+  importJson(`../schemas/gobo.json`, import.meta.url),
+  importJson(`../schemas/manufacturers.json`, import.meta.url),
+  importJson(`../schemas/matrix.json`, import.meta.url),
+  importJson(`../schemas/plugin.json`, import.meta.url),
+  importJson(`../schemas/wheel-slot.json`, import.meta.url),
 ]).then(schemas => {
   ajv.addSchema(schemas);
 });
@@ -34,7 +34,7 @@ const loadSchemasPromise = Promise.all([
  * @param {String} schemaName The name of the schema to load.
  * @returns {ValidateFunction} The validate function for the specified schema.
  */
-module.exports = async function getAjvValidator(schemaName) {
+export default async function getAjvValidator(schemaName) {
   await loadSchemasPromise;
 
   const schemaId = `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/master/schemas/${schemaName}.json`;
@@ -45,4 +45,4 @@ module.exports = async function getAjvValidator(schemaName) {
   }
 
   return validationFunction;
-};
+}
diff --git a/lib/create-github-issue.js b/lib/create-github-issue.js
index 39d850d08f..0357bcc7a1 100644
--- a/lib/create-github-issue.js
+++ b/lib/create-github-issue.js
@@ -1,6 +1,6 @@
-require(`./load-env-file.js`);
+import './load-env-file.js';
 
-const { Octokit } = require(`@octokit/rest`);
+import { Octokit } from '@octokit/rest';
 
 /**
  * @param {String} title The issue heading.
@@ -8,7 +8,7 @@ const { Octokit } = require(`@octokit/rest`);
  * @param {Array.<String>|null} [labels=[]] Array of label names the created issue should be tagged with.
  * @returns {Promise.<String, Error>} A promise that resolves to the issue URL, or rejects with an error.
  */
-module.exports = async function createIssue(title, body, labels = []) {
+export default async function createIssue(title, body, labels = []) {
   const repository = process.env.NODE_ENV === `production` ? `open-fixture-library` : `ofl-test`;
 
   const userToken = process.env.GITHUB_USER_TOKEN;
@@ -30,4 +30,4 @@ module.exports = async function createIssue(title, body, labels = []) {
   });
 
   return result.data.html_url;
-};
+}
diff --git a/lib/create-github-pr.js b/lib/create-github-pr.js
index 6bc496aebb..b748ffd3d5 100644
--- a/lib/create-github-pr.js
+++ b/lib/create-github-pr.js
@@ -1,9 +1,9 @@
-const fixtureJsonStringify = require(`./fixture-json-stringify.js`);
-const { getObjectSortedByKeys } = require(`./register.js`);
+import fixtureJsonStringify from './fixture-json-stringify.js';
+import { getObjectSortedByKeys } from './register.js';
 
-require(`./load-env-file.js`);
+import './load-env-file.js';
 
-const { Octokit } = require(`@octokit/rest`);
+import { Octokit } from '@octokit/rest';
 
 /** @typedef {import('./types.js').FixtureCreateResult} FixtureCreateResult */
 
@@ -13,7 +13,7 @@ const { Octokit } = require(`@octokit/rest`);
  * @param {String|null} [githubComment=null] Additional comment for the pull request.
  * @returns {Promise.<String, Error>} A promise that resolves to the pull request URL, or rejects with an error.
  */
-module.exports = async function createPullRequest(fixtureCreateResult, githubUsername = null, githubComment = null) {
+export default async function createPullRequest(fixtureCreateResult, githubUsername = null, githubComment = null) {
   const {
     manufacturers,
     fixtures,
@@ -294,7 +294,7 @@ module.exports = async function createPullRequest(fixtureCreateResult, githubUse
       githubErrors.push(`Error (${action.toLowerCase()} ${displayName}): \`${error.message}\``);
     }
   }
-};
+}
 
 
 /**
diff --git a/lib/diff-plugin-outputs.js b/lib/diff-plugin-outputs.js
index 35c432fc8f..c3df78c5b0 100644
--- a/lib/diff-plugin-outputs.js
+++ b/lib/diff-plugin-outputs.js
@@ -1,11 +1,12 @@
-const { mkdir, readFile, rm, writeFile } = require(`fs/promises`);
-const path = require(`path`);
-const childProcess = require(`child_process`);
-const JSZip = require(`jszip`);
-const chalk = require(`chalk`);
-const disparity = require(`disparity`);
-const directoryCompare = require(`dir-compare`);
-const promisify = require(`util`).promisify;
+import { mkdir, readFile, rm, writeFile } from 'fs/promises';
+import path from 'path';
+import childProcess from 'child_process';
+import JSZip from 'jszip';
+import chalk from 'chalk';
+import disparity from 'disparity';
+import directoryCompare from 'dir-compare';
+import { fileURLToPath } from 'url';
+import { promisify } from 'util';
 
 /**
  * @typedef {Object} PluginDiffOutput
@@ -23,7 +24,7 @@ const promisify = require(`util`).promisify;
  * @param {Array.<String>} fixtures Paths to the compared fixtures, relative to the current working directory.
  * @returns {Promise.<PluginDiffOutput>} Information what output files were removed, added or changed plus the diffs for changed files.
  */
-module.exports = async function diffPluginOutputs(currentPluginKey, comparePluginKey, ref, fixtures) {
+export default async function diffPluginOutputs(currentPluginKey, comparePluginKey, ref, fixtures) {
   const date = new Date();
 
   // get manufacturer and fixture data later used by export plugins
@@ -42,25 +43,25 @@ module.exports = async function diffPluginOutputs(currentPluginKey, comparePlugi
   console.log(`# fixtures:`, fixtures.map(([manufacturer, fixture]) => `${manufacturer}/${fixture}`).join(`, `));
   console.log();
 
-  const temporaryDirectory = path.join(__dirname, `..`, `tmp`);
-  if (process.cwd().startsWith(temporaryDirectory)) {
+  const temporaryDirectoryUrl = new URL(`../tmp/`, import.meta.url);
+  if (process.cwd().startsWith(fileURLToPath(temporaryDirectoryUrl))) {
     console.error(chalk.red(`[Error]`), `This script can't be run from inside the tmp directory.`);
     process.exit(1);
   }
 
-  const currentOut = path.join(temporaryDirectory, `current_output`);
-  const compareOut = path.join(temporaryDirectory, `compare_output`);
+  const currentOutUrl = new URL(`current_output/`, temporaryDirectoryUrl);
+  const compareOutUrl = new URL(`compare_output/`, temporaryDirectoryUrl);
 
   // delete old temp folder (if it exists) and recreate it
-  await rm(temporaryDirectory, {
+  await rm(temporaryDirectoryUrl, {
     recursive: true,
     force: true,
   });
-  await mkdir(temporaryDirectory, { recursive: true });
+  await mkdir(temporaryDirectoryUrl, { recursive: true });
 
   // export with current plugin script
   try {
-    await exportFixtures(currentOut, currentPluginKey, path.join(__dirname, `..`));
+    await exportFixtures(currentOutUrl, currentPluginKey, new URL(`../`, import.meta.url));
   }
   catch (error) {
     console.error(chalk.red(`[Error]`), `Exporting with current plugin script failed:`, error);
@@ -68,12 +69,12 @@ module.exports = async function diffPluginOutputs(currentPluginKey, comparePlugi
   }
 
   // get compare script and fixture files as archive
-  const compareArchivePath = path.join(temporaryDirectory, `compare.zip`);
-  const unzipDirectory = path.join(temporaryDirectory, `compareFiles`);
+  const compareArchiveUrl = new URL(`compare.zip`, temporaryDirectoryUrl);
+  const unzipDirectoryUrl = new URL(`compareFiles/`, temporaryDirectoryUrl);
 
   try {
-    await promisify(childProcess.exec)(`git archive ${ref} -o ${compareArchivePath}`, {
-      cwd: path.join(__dirname, `..`),
+    await promisify(childProcess.exec)(`git archive ${ref} -o ${fileURLToPath(compareArchiveUrl)}`, {
+      cwd: fileURLToPath(new URL(`../`, import.meta.url)),
       encoding: `utf-8`,
     });
   }
@@ -83,8 +84,8 @@ module.exports = async function diffPluginOutputs(currentPluginKey, comparePlugi
   }
 
   // unzip compare archive
-  await mkdir(unzipDirectory, { recursive: true });
-  const compareArchiveData = await readFile(compareArchivePath);
+  await mkdir(unzipDirectoryUrl, { recursive: true });
+  const compareArchiveData = await readFile(compareArchiveUrl);
   const zip = await JSZip.loadAsync(compareArchiveData);
 
   await Promise.all(Object.values(zip.files).map(async file => {
@@ -92,21 +93,21 @@ module.exports = async function diffPluginOutputs(currentPluginKey, comparePlugi
       return;
     }
 
-    const filePath = path.join(unzipDirectory, file.name);
+    const filePath = fileURLToPath(new URL(file.name, unzipDirectoryUrl));
     await mkdir(path.dirname(filePath), { recursive: true });
     const fileBuffer = await file.async(`nodebuffer`);
     await writeFile(filePath, fileBuffer);
   }));
 
   // delete compare archive
-  await rm(compareArchivePath, {
+  await rm(compareArchiveUrl, {
     recursive: true,
     force: true,
   });
 
   // export with compare plugin script
   try {
-    await exportFixtures(compareOut, comparePluginKey, unzipDirectory);
+    await exportFixtures(compareOutUrl, comparePluginKey, unzipDirectoryUrl);
   }
   catch (error) {
     console.error(chalk.red(`[Error]`), `Exporting with compare plugin script failed:`, error);
@@ -114,7 +115,7 @@ module.exports = async function diffPluginOutputs(currentPluginKey, comparePlugi
   }
 
   // find the differences
-  const outputData = await findDifferences(currentOut, compareOut);
+  const outputData = await findDifferences(fileURLToPath(currentOutUrl), fileURLToPath(compareOutUrl));
 
   console.log(`Done.`);
   return outputData;
@@ -122,14 +123,14 @@ module.exports = async function diffPluginOutputs(currentPluginKey, comparePlugi
 
   /**
    *
-   * @param {String} outputPath The path where to output the exported fixtures.
+   * @param {URL} outputUrl The path where to output the exported fixtures.
    * @param {String} pluginKey The plugin key.
-   * @param {String} baseDirectory The OFL root directory.
+   * @param {URL} baseDirectory The OFL root directory.
    * @returns {Promise.<*, Error>} A Promise that resolves when all exported fixtures are saved to the filesystem.
    */
-  async function exportFixtures(outputPath, pluginKey, baseDirectory) {
-    const plugin = require(path.join(baseDirectory, `plugins/${pluginKey}/export.js`));
-    const { fixtureFromRepository } = require(path.join(baseDirectory, `lib`, `model.js`));
+  async function exportFixtures(outputUrl, pluginKey, baseDirectory) {
+    const plugin = await import(new URL(`plugins/${pluginKey}/export.js`, baseDirectory));
+    const { fixtureFromRepository } = await import(new URL(`lib/model.js`, baseDirectory));
 
     // support export plugins before https://github.com/OpenLightingProject/open-fixture-library/pull/1623/commits/391e6045c6f0fcc0009bec924801b91790d3472c
     const exportFunction = plugin.exportFixtures || plugin.export;
@@ -146,12 +147,12 @@ module.exports = async function diffPluginOutputs(currentPluginKey, comparePlugi
     );
 
     return Promise.all(outFiles.map(async outFile => {
-      const outFilePath = path.join(outputPath, outFile.name);
+      const outFilePath = fileURLToPath(new URL(outFile.name, outputUrl));
       await mkdir(path.dirname(outFilePath), { recursive: true });
       await writeFile(outFilePath, outFile.content);
     }));
   }
-};
+}
 
 /**
  * @param {String} currentOut The output directory of the current version.
diff --git a/lib/esm-shim.cjs b/lib/esm-shim.cjs
new file mode 100644
index 0000000000..53e3966fdf
--- /dev/null
+++ b/lib/esm-shim.cjs
@@ -0,0 +1,17 @@
+/**
+ * @fileoverview
+ * There are some JSON files that need to be imported synchronously, but we
+ * don't want to use the `--experimental-json-modules` command-line flag for
+ * every `node` command. Thus, we require them all here in this CommonJS module
+ * and re-export them for use in ECMAScript modules.
+ *
+ * @see https://nodejs.org/docs/latest-v14.x/api/esm.html#esm_experimental_json_modules
+ */
+
+module.exports.manufacturersSchema = require(`../schemas/manufacturers.json`);
+module.exports.fixtureRedirectSchema = require(`../schemas/fixture-redirect.json`);
+module.exports.fixtureSchema = require(`../schemas/fixture.json`);
+module.exports.channelSchema = require(`../schemas/channel.json`);
+module.exports.capabilitySchema = require(`../schemas/capability.json`);
+module.exports.wheelSlotSchema = require(`../schemas/wheel-slot.json`);
+module.exports.definitionsSchema = require(`../schemas/definitions.json`);
diff --git a/lib/fixture-features/capability-types.js b/lib/fixture-features/capability-types.js
index ca742a00cd..c723a86fb3 100644
--- a/lib/fixture-features/capability-types.js
+++ b/lib/fixture-features/capability-types.js
@@ -1,12 +1,9 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-// see https://github.com/standard-things/esm#getting-started
-require = require(`esm`)(module); // eslint-disable-line no-global-assign
-
-const schemaProperties = require(`../../lib/schema-properties.js`).default;
+import schemaProperties from '../../lib/schema-properties.js';
 const capabilityTypes = Object.keys(schemaProperties.capabilityTypes);
 
-module.exports = capabilityTypes.map(type => ({
+export default capabilityTypes.map(type => ({
   id: `capability-type-${type}`,
   name: `Capability type ${type}`,
   description: `Whether the fixture has at least one capability of type '${type}'`,
diff --git a/lib/fixture-features/duplicate-channel-names.js b/lib/fixture-features/duplicate-channel-names.js
index 32fa95616e..0d77dcfc22 100644
--- a/lib/fixture-features/duplicate-channel-names.js
+++ b/lib/fixture-features/duplicate-channel-names.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `Duplicate channel names`,
 
   /**
diff --git a/lib/fixture-features/fine-channels.js b/lib/fixture-features/fine-channels.js
index 5a7ce6889d..df60ae284d 100644
--- a/lib/fixture-features/fine-channels.js
+++ b/lib/fixture-features/fine-channels.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [
+export default [
   {
     id: `fine-channel-alias`,
     name: `Fine channels (16bit)`,
diff --git a/lib/fixture-features/fine-positions.js b/lib/fixture-features/fine-positions.js
index 4da6b3f775..055ecee818 100644
--- a/lib/fixture-features/fine-positions.js
+++ b/lib/fixture-features/fine-positions.js
@@ -1,7 +1,7 @@
-const { FineChannel } = require(`../model.js`);
+import { FineChannel } from '../model.js';
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [
+export default [
   {
     name: `Fine before coarse`,
     description: `Fine channel used in a mode before its coarse channel`,
diff --git a/lib/fixture-features/floating-point-physicals.js b/lib/fixture-features/floating-point-physicals.js
index 6b41831cab..91c07e50e3 100644
--- a/lib/fixture-features/floating-point-physicals.js
+++ b/lib/fixture-features/floating-point-physicals.js
@@ -1,7 +1,7 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 /** @typedef {import('../model/Physical.js').default} Physical */
 
-module.exports = [
+const fixtureFeatures = [
   {
     id: `floating-point-dimensions`,
     name: `Floating point dimensions`,
@@ -35,13 +35,15 @@ module.exports = [
   },
 ];
 
-for (const fixtureFeature of module.exports) {
+export default fixtureFeatures.map(fixtureFeature => ({
+  ...fixtureFeature,
+
   /**
    * @param {Fixture} fixture The Fixture instance
    * @returns {Boolean} true if the fixture uses the feature
    */
-  fixtureFeature.hasFeature = fixture => isFloatInPhysical(fixture.physical, fixtureFeature.properties) || fixture.modes.some(mode => isFloatInPhysical(mode.physical, fixtureFeature.properties));
-}
+  hasFeature: fixture => isFloatInPhysical(fixture.physical, fixtureFeature.properties) || fixture.modes.some(mode => isFloatInPhysical(mode.physical, fixtureFeature.properties)),
+}));
 
 /**
  * @param {Physical|null} physical The physical data to check
diff --git a/lib/fixture-features/many-modes.js b/lib/fixture-features/many-modes.js
index eb6374a1b1..eba0ba1d85 100644
--- a/lib/fixture-features/many-modes.js
+++ b/lib/fixture-features/many-modes.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `Many modes`,
   description: `True if the fixture has more than 15 modes.`,
 
diff --git a/lib/fixture-features/matrices.js b/lib/fixture-features/matrices.js
index 908211408d..3c932f47f3 100644
--- a/lib/fixture-features/matrices.js
+++ b/lib/fixture-features/matrices.js
@@ -1,8 +1,7 @@
-const { FineChannel } = require(`../model.js`);
+import { FineChannel, SwitchingChannel } from '../model.js';
 /** @typedef {import('../model/Fixture.js').default} Fixture */
-const { SwitchingChannel } = require(`../model.js`);
 
-module.exports = [
+export default [
   {
     id: `matrix-pixelKeys`,
     name: `Uses pixelKeys`,
diff --git a/lib/fixture-features/multiple-categories.js b/lib/fixture-features/multiple-categories.js
index 2d55828656..bb112ea9ef 100644
--- a/lib/fixture-features/multiple-categories.js
+++ b/lib/fixture-features/multiple-categories.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `Multiple categories`,
 
   /**
diff --git a/lib/fixture-features/multiple-focuses.js b/lib/fixture-features/multiple-focuses.js
index 863fa110b9..72d9329f58 100644
--- a/lib/fixture-features/multiple-focuses.js
+++ b/lib/fixture-features/multiple-focuses.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `Multiple Focuses`,
   description: `True if multiple Pan / Tilt channels are used in some mode.`,
 
diff --git a/lib/fixture-features/no-physical-data.js b/lib/fixture-features/no-physical-data.js
index 25c91402c4..46438d1c0d 100644
--- a/lib/fixture-features/no-physical-data.js
+++ b/lib/fixture-features/no-physical-data.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `No physical`,
 
   /**
diff --git a/lib/fixture-features/null-channels.js b/lib/fixture-features/null-channels.js
index 20d8de49ee..802dddf645 100644
--- a/lib/fixture-features/null-channels.js
+++ b/lib/fixture-features/null-channels.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `\`null\` channels`,
   description: `Channel list of a mode contains null, so it has an unused channel`,
 
diff --git a/lib/fixture-features/physical-override.js b/lib/fixture-features/physical-override.js
index 7642a7e99e..d2418fd94a 100644
--- a/lib/fixture-features/physical-override.js
+++ b/lib/fixture-features/physical-override.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `Physical override`,
   description: `Whether at least one mode uses the 'physical' property`,
 
diff --git a/lib/fixture-features/rdm.js b/lib/fixture-features/rdm.js
index 65bb08be15..23727fd2ba 100644
--- a/lib/fixture-features/rdm.js
+++ b/lib/fixture-features/rdm.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `RDM`,
   description: `Whether an RDM model ID is set`,
 
diff --git a/lib/fixture-features/redirect-reasons.js b/lib/fixture-features/redirect-reasons.js
index 68e77ad2f8..3a830733f5 100644
--- a/lib/fixture-features/redirect-reasons.js
+++ b/lib/fixture-features/redirect-reasons.js
@@ -1,17 +1,14 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-// see https://github.com/standard-things/esm#getting-started
-require = require(`esm`)(module); // eslint-disable-line no-global-assign
+import importJson from '../import-json.js';
+import schemaProperties from '../../lib/schema-properties.js';
 
-const importJson = require(`../import-json.js`);
-const schemaProperties = require(`../../lib/schema-properties.js`).default;
-
-const registerPromise = importJson(`../../fixtures/register.json`, __dirname);
+const registerPromise = importJson(`../../fixtures/register.json`, import.meta.url);
 
 /** @type {Array.<String>} */
 const redirectReasons = schemaProperties.fixtureRedirect.reason.enum;
 
-module.exports = redirectReasons.map(reason => ({
+export default redirectReasons.map(reason => ({
   id: `redirect-reason-${reason}`,
   name: `Fixture redirect reason ${reason}`,
   description: `Whether the fixture is a fixture redirect with reason '${reason}'`,
diff --git a/lib/fixture-features/reused-channels.js b/lib/fixture-features/reused-channels.js
index 1bce0a65bd..524cb01325 100644
--- a/lib/fixture-features/reused-channels.js
+++ b/lib/fixture-features/reused-channels.js
@@ -1,6 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [{
+export default [{
   name: `Reused channels`,
   description: `Whether there is at least one channel that is used in different modes`,
 
diff --git a/lib/fixture-features/switching-channels.js b/lib/fixture-features/switching-channels.js
index 295b10cb5d..680b3090a7 100644
--- a/lib/fixture-features/switching-channels.js
+++ b/lib/fixture-features/switching-channels.js
@@ -1,7 +1,7 @@
-const { FineChannel } = require(`../model.js`);
+import { FineChannel } from '../model.js';
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-module.exports = [
+export default [
   {
     id: `switching-channels`,
     name: `Switching channels`,
diff --git a/lib/fixture-features/wheels.js b/lib/fixture-features/wheels.js
index 38670faace..449394b5b6 100644
--- a/lib/fixture-features/wheels.js
+++ b/lib/fixture-features/wheels.js
@@ -1,9 +1,6 @@
 /** @typedef {import('../model/Fixture.js').default} Fixture */
 
-// see https://github.com/standard-things/esm#getting-started
-require = require(`esm`)(module); // eslint-disable-line no-global-assign
-
-const schemaProperties = require(`../../lib/schema-properties.js`).default;
+import schemaProperties from '../../lib/schema-properties.js';
 const wheelSlotTypes = Object.keys(schemaProperties.wheelSlotTypes);
 const wheelTypes = wheelSlotTypes.filter(type => !type.startsWith(`AnimationGobo`)).concat(`AnimationGobo`);
 
@@ -53,4 +50,4 @@ const resourceFeature = {
   ),
 };
 
-module.exports = wheelTypeFeatures.concat(wheelSlotTypeFeatures, resourceFeature);
+export default wheelTypeFeatures.concat(wheelSlotTypeFeatures, resourceFeature);
diff --git a/lib/fixture-json-stringify.js b/lib/fixture-json-stringify.js
index 8650efcf80..b905bfed75 100644
--- a/lib/fixture-json-stringify.js
+++ b/lib/fixture-json-stringify.js
@@ -4,7 +4,7 @@
  * @param {Object} object JSON object.
  * @returns {String} String representing the given object.
  */
-module.exports = function fixtureJsonStringify(object) {
+export default function fixtureJsonStringify(object) {
   let string = JSON.stringify(object, null, 2);
 
   // make number arrays fit in one line
@@ -18,4 +18,4 @@ module.exports = function fixtureJsonStringify(object) {
   );
 
   return `${string}\n`;
-};
+}
diff --git a/lib/get-ajv-error-messages.js b/lib/get-ajv-error-messages.js
index e06e6d3859..0c8c2f4be7 100644
--- a/lib/get-ajv-error-messages.js
+++ b/lib/get-ajv-error-messages.js
@@ -41,7 +41,7 @@ const getDetailsPerAjvKeyword = {
  * @param {String} [rootName=`root`] The display name of the root object in the error data path.
  * @returns {String} A human-readable validation error message.
  */
-module.exports = function getAjvErrorMessages(ajvErrors, rootName = `root`) {
+export default function getAjvErrorMessages(ajvErrors, rootName = `root`) {
   const errors = ajvErrors.filter(error => !(`propertyName` in error));
 
   return errors.map(error => {
@@ -50,7 +50,7 @@ module.exports = function getAjvErrorMessages(ajvErrors, rootName = `root`) {
     const errorMessage = `${rootName}${error.instancePath}${getDataDescription(error.data)} ${details}`;
     return errorMessage.replace(/\n/g, `\\n`);
   });
-};
+}
 
 /**
  * @param {*} data Any kind of data; not all types can be represented.
diff --git a/lib/import-json.js b/lib/import-json.js
index 3e6b0bbd2e..86ce30b9ff 100644
--- a/lib/import-json.js
+++ b/lib/import-json.js
@@ -1,12 +1,12 @@
-const { readFile } = require(`fs/promises`);
-const path = require(`path`);
+import { readFile } from 'fs/promises';
+import path from 'path';
 
 /**
  * @param {String|URL} jsonPath The JSON file path.
  * @param {String|URL|undefined} basePath A path from which the JSON path is resolved relative to.
  * @returns {Promise.<*>} A Promise that resolves to the parsed JSON file content.
  */
-module.exports = async function importJson(jsonPath, basePath) {
+export default async function importJson(jsonPath, basePath) {
   if (typeof basePath === `string` && !basePath.startsWith(`file:`)) {
     jsonPath = path.resolve(basePath, jsonPath);
   }
@@ -15,4 +15,4 @@ module.exports = async function importJson(jsonPath, basePath) {
   }
 
   return JSON.parse(await readFile(jsonPath, `utf8`));
-};
+}
diff --git a/lib/load-env-file.js b/lib/load-env-file.js
index 427a549a48..c67d1a4f7d 100644
--- a/lib/load-env-file.js
+++ b/lib/load-env-file.js
@@ -1,5 +1,5 @@
-const path = require(`path`);
-const env = require(`node-env-file`);
+import env from 'node-env-file';
+import { fileURLToPath } from 'url';
 
-const envFile = path.join(__dirname, `../.env`);
-env(envFile, { raise: false });
+const envFilePath = fileURLToPath(new URL(`../.env`, import.meta.url));
+env(envFilePath, { raise: false });
diff --git a/lib/model.js b/lib/model.js
index 759f85dda5..38b441f8e9 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -1,28 +1,26 @@
-const path = require(`path`);
-const { readFile } = require(`fs/promises`);
-
-const importJson = require(`./import-json.js`);
-
-// see https://github.com/standard-things/esm#getting-started
-require = require(`esm`)(module); // eslint-disable-line no-global-assign
-
-const AbstractChannel = require(`./model/AbstractChannel.js`).default;
-const Capability = require(`./model/Capability.js`).default;
-const CoarseChannel = require(`./model/CoarseChannel.js`).default;
-const Entity = require(`./model/Entity.js`).default;
-const FineChannel = require(`./model/FineChannel.js`).default;
-const Fixture = require(`./model/Fixture.js`).default;
-const Manufacturer = require(`./model/Manufacturer.js`).default;
-const Matrix = require(`./model/Matrix.js`).default;
-const Meta = require(`./model/Meta.js`).default;
-const Mode = require(`./model/Mode.js`).default;
-const NullChannel = require(`./model/NullChannel.js`).default;
-const Physical = require(`./model/Physical.js`).default;
-const Range = require(`./model/Range.js`).default;
-const SwitchingChannel = require(`./model/SwitchingChannel.js`).default;
-const TemplateChannel = require(`./model/TemplateChannel.js`).default;
-const Wheel = require(`./model/Wheel.js`).default;
-const WheelSlot = require(`./model/WheelSlot.js`).default;
+import path from 'path';
+import { readFile } from 'fs/promises';
+import { fileURLToPath } from 'url';
+
+import importJson from './import-json.js';
+
+import AbstractChannel from './model/AbstractChannel.js';
+import Capability from './model/Capability.js';
+import CoarseChannel from './model/CoarseChannel.js';
+import Entity from './model/Entity.js';
+import FineChannel from './model/FineChannel.js';
+import Fixture from './model/Fixture.js';
+import Manufacturer from './model/Manufacturer.js';
+import Matrix from './model/Matrix.js';
+import Meta from './model/Meta.js';
+import Mode from './model/Mode.js';
+import NullChannel from './model/NullChannel.js';
+import Physical from './model/Physical.js';
+import Range from './model/Range.js';
+import SwitchingChannel from './model/SwitchingChannel.js';
+import TemplateChannel from './model/TemplateChannel.js';
+import Wheel from './model/Wheel.js';
+import WheelSlot from './model/WheelSlot.js';
 
 /**
  * Look up the fixture definition in the directory structure and create a Fixture instance.
@@ -54,11 +52,11 @@ async function fixtureFromFile(absolutePath) {
  */
 async function fixtureFromRepository(manufacturerKey, fixtureKey) {
   let fixturePath = `../fixtures/${manufacturerKey}/${fixtureKey}.json`;
-  let fixtureJson = await importJson(fixturePath, __dirname);
+  let fixtureJson = await importJson(fixturePath, import.meta.url);
 
   if (fixtureJson.$schema.endsWith(`/fixture-redirect.json`)) {
     fixturePath = `../fixtures/${fixtureJson.redirectTo}.json`;
-    fixtureJson = Object.assign({}, await importJson(fixturePath, __dirname), { name: fixtureJson.name });
+    fixtureJson = Object.assign({}, await importJson(fixturePath, import.meta.url), { name: fixtureJson.name });
   }
 
   const manufacturer = await manufacturerFromRepository(manufacturerKey);
@@ -73,7 +71,7 @@ async function fixtureFromRepository(manufacturerKey, fixtureKey) {
  * @returns {Promise.<Manufacturer>} A Promise that resolves to the created Manufacturer instance.
  */
 async function manufacturerFromRepository(manufacturerKey) {
-  const manufacturers = await importJson(`../fixtures/manufacturers.json`, __dirname);
+  const manufacturers = await importJson(`../fixtures/manufacturers.json`, import.meta.url);
   return new Manufacturer(manufacturerKey, manufacturers[manufacturerKey]);
 }
 
@@ -99,24 +97,24 @@ async function embedResourcesIntoFixtureJson(fixtureJson) {
 async function getResourceFromString(resourceName) {
   const { type, key, alias } = await resolveResourceName(resourceName);
 
-  const resourceBasePath = path.join(__dirname, `../resources/${type}`);
-  const resourcePath = `${resourceBasePath}/${key}.json`;
+  const resourceBaseUrl = new URL(`../resources/${type}/`, import.meta.url);
+  const resourceUrl = new URL(`${key}.json`, resourceBaseUrl);
 
   let resourceData;
 
   try {
-    resourceData = await importJson(resourcePath);
+    resourceData = await importJson(resourceUrl);
   }
   catch (error) {
     throw error instanceof SyntaxError
-      ? new Error(`Resource file '${resourcePath}' could not be parsed as JSON.`)
+      ? new Error(`Resource file '${fileURLToPath(resourceUrl)}' could not be parsed as JSON.`)
       : new Error(`Resource '${resourceName}' not found.`);
   }
 
   resourceData.key = key;
   resourceData.type = type;
   resourceData.alias = alias;
-  resourceData.image = await getImageForResource(type, resourceBasePath, key);
+  resourceData.image = await getImageForResource(type, resourceBaseUrl, key);
 
   delete resourceData.$schema;
 
@@ -144,7 +142,7 @@ async function resolveResourceName(resourceName) {
 
     let aliases;
     try {
-      aliases = await importJson(`../${aliasesFilePath}`, __dirname);
+      aliases = await importJson(`../${aliasesFilePath}`, import.meta.url);
     }
     catch {
       throw new Error(`Resource aliases file '${aliasesFilePath}' not found.`);
@@ -189,14 +187,14 @@ const resourceFileFormats = [
 
 /**
  * @param {String} type The resource type, i.e. name of the directory inside the resources directory.
- * @param {String} basePath The path of the resource directory.
+ * @param {URL} baseUrl The path of the resource directory.
  * @param {String} key The resource key.
  * @returns {Promise.<ResourceImage|undefined>} A Promise that resolves to the resource image, or undefined if none could be found.
  */
-async function getImageForResource(type, basePath, key) {
+async function getImageForResource(type, baseUrl, key) {
   for (const { extension, mimeType, encoding } of resourceFileFormats) {
     try {
-      let data = await readFile(`${basePath}/${key}.${extension}`, encoding);
+      let data = await readFile(new URL(`${key}.${extension}`, baseUrl), encoding);
 
       if (extension === `svg`) {
         // see https://cloudfour.com/thinks/simple-svg-placeholder/#how-it-works
@@ -217,13 +215,13 @@ async function getImageForResource(type, basePath, key) {
 
   if (type === `gobos`) {
     const fileExtensions = resourceFileFormats.map(({ extension }) => extension);
-    throw new Error(`Expected gobo image for resource '${basePath}/${key}' not found (supported file extensions: ${fileExtensions.join(`, `)}).`);
+    throw new Error(`Expected gobo image for resource '${fileURLToPath(new URL(key, baseUrl))}' not found (supported file extensions: ${fileExtensions.join(`, `)}).`);
   }
 
   return undefined;
 }
 
-module.exports = {
+export {
   AbstractChannel,
   Capability,
   CoarseChannel,
diff --git a/lib/model/.eslintrc.json b/lib/model/.eslintrc.json
deleted file mode 100644
index bd14a19ef2..0000000000
--- a/lib/model/.eslintrc.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "parserOptions": {
-    "sourceType": "module"
-  }
-}
diff --git a/lib/register.js b/lib/register.js
index 06ee4cfa1e..d01787ae0a 100644
--- a/lib/register.js
+++ b/lib/register.js
@@ -1,5 +1,5 @@
-const ColorHash = require(`color-hash`).default;
-const colorHash = new ColorHash({
+import ColorHash from 'color-hash';
+const colorHash = new (ColorHash.default || ColorHash)({
   lightness: [0.5, 0.6],
   saturation: [0.5, 0.6, 0.7],
   hash: string => Array.from(string).reduce((accumulator, char, index) => {
@@ -11,7 +11,7 @@ const colorHash = new ColorHash({
 /**
  * A data store for the fixture register.
  */
-class Register {
+export class Register {
   /**
    * Create a new register instance.
    * @param {Object} manufacturers An object of all known manufacturers like specified by the manufacturer schema.
@@ -250,7 +250,7 @@ class Register {
  * @param {ItemMapFunction|null} itemMapFunction A function to be invoked for every object value to process it (useful to sort array values).
  * @returns {Object} A new object with the same entries, sorted by keys.
  */
-function getObjectSortedByKeys(object, itemMapFunction) {
+export function getObjectSortedByKeys(object, itemMapFunction) {
   const sortedObject = {};
   const keys = Object.keys(object).sort(localeSort);
 
@@ -296,8 +296,3 @@ function getFixtureLastAction(fixtureMeta) {
     lastActionDate: fixtureMeta.lastModifyDate,
   };
 }
-
-module.exports = {
-  Register,
-  getObjectSortedByKeys,
-};
diff --git a/lib/schema-properties.js b/lib/schema-properties.js
index 3097d18cb8..8fff7dbe0b 100644
--- a/lib/schema-properties.js
+++ b/lib/schema-properties.js
@@ -1,10 +1,12 @@
-import manufacturersSchema from '../schemas/manufacturers.json';
-import fixtureRedirectSchema from '../schemas/fixture-redirect.json';
-import fixtureSchema from '../schemas/fixture.json';
-import channelSchema from '../schemas/channel.json';
-import capabilitySchema from '../schemas/capability.json';
-import wheelSlotSchema from '../schemas/wheel-slot.json';
-import definitionsSchema from '../schemas/definitions.json';
+import {
+  manufacturersSchema,
+  fixtureRedirectSchema,
+  fixtureSchema,
+  channelSchema,
+  capabilitySchema,
+  wheelSlotSchema,
+  definitionsSchema,
+} from '../lib/esm-shim.cjs';
 
 const fixtureProperties = fixtureSchema.properties;
 const physicalProperties = fixtureProperties.physical.properties;
diff --git a/lib/server-response-helpers.js b/lib/server-response-helpers.js
index fa6190084a..d928860704 100644
--- a/lib/server-response-helpers.js
+++ b/lib/server-response-helpers.js
@@ -5,7 +5,7 @@
  * @param {ServerResponse} response The Node ServerResponse object.
  * @param {Object} jsonObject The JSON object to send.
  */
-function sendJson(response, jsonObject) {
+export function sendJson(response, jsonObject) {
   response.setHeader(`Content-Type`, `application/json`);
   response.end(JSON.stringify(jsonObject));
 }
@@ -17,13 +17,8 @@ function sendJson(response, jsonObject) {
  * @param {String} file.mimetype The MIME type to set.
  * @param {String|Buffer} file.content The content of the file attachment.
  */
-function sendAttachment(response, { name, mimetype, content }) {
+export function sendAttachment(response, { name, mimetype, content }) {
   response.setHeader(`Content-Type`, mimetype);
   response.setHeader(`Content-Disposition`, `attachment; filename="${name}"`);
   response.end(content);
 }
-
-module.exports = {
-  sendJson,
-  sendAttachment,
-};
diff --git a/lib/site-crawler.js b/lib/site-crawler.js
index 5bbfa4be4d..d14b535f64 100644
--- a/lib/site-crawler.js
+++ b/lib/site-crawler.js
@@ -1,8 +1,8 @@
-const childProcess = require(`child_process`);
-const EventEmitter = require(`events`);
-const { SiteChecker } = require(`broken-link-checker`);
+import childProcess from 'child_process';
+import EventEmitter from 'events';
+import brokenLinkChecker from 'broken-link-checker';
 
-const importJson = require(`./import-json.js`);
+import importJson from './import-json.js';
 
 const BASE_URL = `http://localhost:${process.env.PORT || 3000}`;
 
@@ -11,7 +11,7 @@ const BASE_URL = `http://localhost:${process.env.PORT || 3000}`;
  * @emits failingPage The URL of a failing (internal) page and an error string.
  * @emits externalLinkFound The URL of an external link.
  */
-class SiteCrawler extends EventEmitter {
+export default class SiteCrawler extends EventEmitter {
   /**
    * Starts the production OFL server by creating a new child process.
    * Make sure that 'npm run build' has been called before this function is executed!
@@ -49,10 +49,10 @@ class SiteCrawler extends EventEmitter {
    * @returns {Promise} Promise that resolves as soon as the crawling has finished.
    */
   async crawl() {
-    const exportPluginKeys = (await importJson(`../plugins/plugins.json`, __dirname)).exportPlugins;
+    const exportPluginKeys = (await importJson(`../plugins/plugins.json`, import.meta.url)).exportPlugins;
 
     return new Promise((resolve, reject) => {
-      const siteChecker = new SiteChecker({
+      const siteChecker = new brokenLinkChecker.SiteChecker({
         excludeExternalLinks: true,
         filterLevel: 3,
         honorRobotExclusions: false,
@@ -126,5 +126,3 @@ class SiteCrawler extends EventEmitter {
     return { stdout: this.serverStdout, stderr: this.serverStderr };
   }
 }
-
-module.exports = SiteCrawler;
diff --git a/lib/types.js b/lib/types.js
index addad4cd7f..881d903694 100644
--- a/lib/types.js
+++ b/lib/types.js
@@ -1,5 +1,5 @@
 // needed for VS Code to import typedefs from this file
-module.exports = null;
+export default null;
 
 /**
  * @typedef {Object} FixtureCreateResult
diff --git a/nuxt.config.js b/nuxt.config.js
index 78fbf84968..7e8b17340e 100644
--- a/nuxt.config.js
+++ b/nuxt.config.js
@@ -1,4 +1,4 @@
-import path from 'path';
+import { fileURLToPath } from 'url';
 
 import plugins from './plugins/plugins.json';
 import register from './fixtures/register.json';
@@ -71,7 +71,7 @@ export default {
     },
     extend(config, context) {
       // exclude /assets/icons from url-loader
-      const iconsPath = path.resolve(__dirname, `ui/assets/icons`);
+      const iconsPath = fileURLToPath(new URL(`ui/assets/icons/`, import.meta.url));
       const urlLoader = config.module.rules.find(rule => rule.test.toString().includes(`|svg|`));
       urlLoader.exclude = iconsPath;
 
diff --git a/package-lock.json b/package-lock.json
index 6dcfff9cf7..e1be4b690b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2674,28 +2674,28 @@
       }
     },
     "@nuxt/telemetry": {
-      "version": "1.3.3",
-      "resolved": "https://registry.npmjs.org/@nuxt/telemetry/-/telemetry-1.3.3.tgz",
-      "integrity": "sha512-ElnoAJo1n/Ui0j9i3xqhXajoGJdEwmkEtsWftlZUpQNJxdfoz+623qnt9XHMYa0X5Nf1PXYdcUKa2u4AASXOjA==",
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/@nuxt/telemetry/-/telemetry-1.3.6.tgz",
+      "integrity": "sha512-sZpLf/rU3cvN8/alR1HpJIl3mHPA1GOg41GKdOOrtw7Gi/lCEVk4hK+lpXgYInZ2n6i1JyknpKhM9YzX2RU33w==",
       "requires": {
         "arg": "^5.0.0",
-        "chalk": "^4.1.0",
-        "ci-info": "^2.0.0",
-        "consola": "^2.15.0",
+        "chalk": "^4.1.1",
+        "ci-info": "^3.1.1",
+        "consola": "^2.15.3",
         "create-require": "^1.1.1",
-        "defu": "^3.2.2",
+        "defu": "^5.0.0",
         "destr": "^1.1.0",
-        "dotenv": "^8.2.0",
+        "dotenv": "^9.0.2",
         "fs-extra": "^8.1.0",
-        "git-url-parse": "^11.4.3",
+        "git-url-parse": "^11.4.4",
         "inquirer": "^7.3.3",
-        "is-docker": "^2.1.1",
-        "jiti": "^1.3.0",
-        "nanoid": "^3.1.20",
+        "is-docker": "^2.2.1",
+        "jiti": "^1.9.2",
+        "nanoid": "^3.1.23",
         "node-fetch": "^2.6.1",
         "parse-git-config": "^3.0.0",
         "rc9": "^1.2.0",
-        "std-env": "^2.2.1"
+        "std-env": "^2.3.0"
       },
       "dependencies": {
         "arg": {
@@ -2703,25 +2703,15 @@
           "resolved": "https://registry.npmjs.org/arg/-/arg-5.0.0.tgz",
           "integrity": "sha512-4P8Zm2H+BRS+c/xX1LrHw0qKpEhdlZjLCgWy+d78T9vqa2Z2SiD2wMrYuWIAFy5IZUD7nnNXroRttz+0RzlrzQ=="
         },
-        "ci-info": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
-          "integrity": "sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ=="
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-      "resolved": "https://registry.npmjs.org/json-pointer/-/json-pointer-0.6.0.tgz",
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@@ -10892,6 +11183,36 @@
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@@ -10924,9 +11245,9 @@
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@@ -13407,6 +13728,66 @@
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       }
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+          "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
+          "dev": true,
+          "requires": {
+            "p-locate": "^2.0.0",
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+          }
+        },
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+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-1.3.0.tgz",
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+          "dev": true,
+          "requires": {
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+          }
+        },
+        "p-locate": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-2.0.0.tgz",
+          "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
+          "dev": true,
+          "requires": {
+            "p-limit": "^1.1.0"
+          }
+        },
+        "p-try": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
+          "integrity": "sha1-y8ec26+P1CKOE/Yh8rGiN8GyB7M=",
+          "dev": true
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "dev": true
+        }
+      }
+    },
     "pluralize": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/pluralize/-/pluralize-8.0.0.tgz",
@@ -15623,9 +16004,9 @@
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-      "version": "10.1.1",
-      "resolved": "https://registry.npmjs.org/sass-loader/-/sass-loader-10.1.1.tgz",
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+      "version": "10.2.0",
+      "resolved": "https://registry.npmjs.org/sass-loader/-/sass-loader-10.2.0.tgz",
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@@ -15634,6 +16015,17 @@
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+        "ajv": {
+          "version": "6.12.6",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+          "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "fast-json-stable-stringify": "^2.0.0",
+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
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         "emojis-list": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/emojis-list/-/emojis-list-3.0.0.tgz",
@@ -15645,9 +16037,9 @@
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         "json5": {
-          "version": "2.1.3",
-          "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.3.tgz",
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+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.0.tgz",
+          "integrity": "sha512-f+8cldu7X/y7RAJurMEJmdoKXGB/X550w2Nr3tTbezL6RwEE/iMcm+tZnXeoZtKuOq6ft8+CqzEkrIgx1fPoQA==",
           "requires": {
             "minimist": "^1.2.5"
           }
@@ -15683,25 +16075,12 @@
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             "ajv-keywords": "^3.5.2"
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-              "requires": {
-                "fast-deep-equal": "^3.1.1",
-                "fast-json-stable-stringify": "^2.0.0",
-                "json-schema-traverse": "^0.4.1",
-                "uri-js": "^4.2.2"
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-          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
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+          "version": "7.3.5",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
+          "integrity": "sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==",
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@@ -16633,6 +17012,12 @@
         "ansi-regex": "^2.0.0"
       }
     },
+    "strip-bom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+      "dev": true
+    },
     "strip-eof": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
@@ -17391,9 +17776,9 @@
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-          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+          "version": "4.0.3",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+          "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
           "dev": true
         },
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@@ -18040,6 +18425,18 @@
       "resolved": "https://registry.npmjs.org/ts-pnp/-/ts-pnp-1.2.0.tgz",
       "integrity": "sha512-csd+vJOb/gkzvcCHgTGSChYpy5f1/XKNsmvBGO4JXS+z1v2HobugDz4s1IeFXM3wZB44uczs+eazB5Q/ccdhQw=="
     },
+    "tsconfig-paths": {
+      "version": "3.9.0",
+      "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.9.0.tgz",
+      "integrity": "sha512-dRcuzokWhajtZWkQsDVKbWyY+jgcLC5sqJhg2PSgf4ZkH2aHPvaOY8YWGhmjb68b5qqTfasSsDO9k7RUiEmZAw==",
+      "dev": true,
+      "requires": {
+        "@types/json5": "^0.0.29",
+        "json5": "^1.0.1",
+        "minimist": "^1.2.0",
+        "strip-bom": "^3.0.0"
+      }
+    },
     "tslib": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.2.0.tgz",
@@ -18155,9 +18552,9 @@
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-      "version": "1.10.2",
-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.10.2.tgz",
-      "integrity": "sha512-N4P+Q/BuyuEKFJ43B9gYuOj4TQUHXX+j2FqguVOpjkssLUUrnJofCcBccJSCoeturDoZU6GorDTHSvUDlSQbTg==",
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.1.tgz",
+      "integrity": "sha512-hzSoAVtJF+3ZtiFX0VgfFPHEDRm7Y/QPjGyNo4TVdnDTdft3tr8hEkD25a1jC+TjTuE7tkHGKkhwCgs9dgBB2g==",
       "dev": true
     },
     "unfetch": {
@@ -18381,9 +18778,9 @@
       }
     },
     "urijs": {
-      "version": "1.19.5",
-      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.5.tgz",
-      "integrity": "sha512-48z9VGWwdCV5KfizHsE05DWS5fhK6gFlx5MjO7xu0Krc5FGPWzjlXEVV0nPMrdVuP7xmMHiPZ2HoYZwKOFTZOg==",
+      "version": "1.19.6",
+      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.6.tgz",
+      "integrity": "sha512-eSXsXZ2jLvGWeLYlQA3Gh36BcjF+0amo92+wHPyN1mdR8Nxf75fuEuYTd9c0a+m/vhCjRK0ESlE9YNLW+E1VEw==",
       "dev": true
     },
     "urix": {
@@ -19489,7 +19886,7 @@
         "fast-safe-stringify": "^2.0.7",
         "highlightjs": "^9.12.0",
         "httpsnippet": "^1.19.0",
-        "jgexml": "^0.4.3",
+        "jgexml": "^0.4.4",
         "markdown-it": "^10.0.0",
         "markdown-it-emoji": "^1.4.0",
         "node-fetch": "^2.0.0",
@@ -19501,6 +19898,14 @@
         "urijs": "^1.19.0",
         "yaml": "^1.8.3",
         "yargs": "^12.0.5"
+      },
+      "dependencies": {
+        "jgexml": {
+          "version": "0.4.4",
+          "resolved": "https://registry.npmjs.org/jgexml/-/jgexml-0.4.4.tgz",
+          "integrity": "sha512-j0AzSWT7LXy3s3i1cdv5NZxUtscocwiBxgOLiEBfitCehm8STdXVrcOlbAWsJFLCq1elZYpQlGqA9k8Z+n9iJA==",
+          "dev": true
+        }
       }
     },
     "wide-align": {
@@ -19707,9 +20112,9 @@
       }
     },
     "y18n": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w=="
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+      "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ=="
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       "version": "2.1.2",
diff --git a/package.json b/package.json
index 74ed113838..58aaf497e7 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
   "engines": {
     "node": "14.15.0"
   },
+  "type": "module",
   "scripts": {
     "dev": "nuxt dev",
     "start": "nuxt start",
@@ -61,7 +62,7 @@
     "openapi-backend": "^3.9.2",
     "sanitize-filename": "^1.6.3",
     "sass": "^1.33.0",
-    "sass-loader": "^10.1.1",
+    "sass-loader": "^10.2.0",
     "scroll-into-view": "^1.15.0",
     "svg-inline-loader": "^0.8.2",
     "uuid": "^8.3.2",
@@ -78,6 +79,7 @@
     "disparity": "^3.2.0",
     "eslint": "~7.26.0",
     "eslint-plugin-array-func": "~3.1.7",
+    "eslint-plugin-import": "^2.23.3",
     "eslint-plugin-jsdoc": "~34.8.2",
     "eslint-plugin-jsonc": "~1.2.1",
     "eslint-plugin-markdown": "~2.1.0",
diff --git a/plugins/aglight/export.js b/plugins/aglight/export.js
index 7edd407843..859d9ef27a 100644
--- a/plugins/aglight/export.js
+++ b/plugins/aglight/export.js
@@ -1,30 +1,30 @@
 /* Based on the ofl export plugin */
 
-const fixtureJsonStringify = require(`../../lib/fixture-json-stringify.js`);
-const namedColors = require(`color-name-list`);
+import fixtureJsonStringify from '../../lib/fixture-json-stringify.js';
+import namedColors from 'color-name-list/dist/colornames.esm.mjs';
 
-const { Entity, NullChannel } = require(`../../lib/model.js`);
-const importJson = require(`../../lib/import-json.js`);
+import { Entity, NullChannel } from '../../lib/model.js';
+import importJson from '../../lib/import-json.js';
 
 /** @typedef {import('../../lib/model/Fixture.js').default} Fixture */
 
 const units = new Set([`K`, `deg`, `%`, `ms`, `Hz`, `m^3/min`, `rpm`]);
 const excludeKeys = new Set([`comment`, `name`, `helpWanted`, `type`, `effectName`, `effectPreset`, `shutterEffect`, `wheel`, `isShaking`, `fogType`, `menuClick`]);
 
-module.exports.version = `1.0.0`;
+export const version = `1.0.0`;
 
 /**
  * @param {Array.<Fixture>} fixtures An array of Fixture objects.
  * @param {Object} options Global options, including:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory.
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = async function exportAGLight(fixtures, options) {
-  const displayedPluginVersion = options.displayedPluginVersion || module.exports.version;
+export async function exportFixtures(fixtures, options) {
+  const displayedPluginVersion = options.displayedPluginVersion || version;
 
-  const manufacturers = await importJson(`../../fixtures/manufacturers.json`, __dirname);
+  const manufacturers = await importJson(`../../fixtures/manufacturers.json`, import.meta.url);
 
   const library = {
     version: displayedPluginVersion,
@@ -51,7 +51,7 @@ module.exports.exportFixtures = async function exportAGLight(fixtures, options)
     mimetype: `application/aglight-fixture-library`,
     fixtures,
   }];
-};
+}
 
 /**
  * Resolves matrix channels in modes' channel lists.
diff --git a/plugins/colorsource/export.js b/plugins/colorsource/export.js
index 33f2852838..538b2a92db 100644
--- a/plugins/colorsource/export.js
+++ b/plugins/colorsource/export.js
@@ -1,16 +1,13 @@
-// see https://github.com/standard-things/esm#getting-started
-require = require(`esm`)(module); // eslint-disable-line no-global-assign
-const { v5: uuidv5 } = require(`uuid`);
+import { v5 as uuidv5 } from 'uuid';
 
-const {
+import {
   CoarseChannel,
   FineChannel,
   SwitchingChannel,
-} = require(`../../lib/model.js`);
-const { scaleDmxValue } = require(`../../lib/scale-dmx-values.js`);
+} from '../../lib/model.js';
+import { scaleDmxValue } from '../../lib/scale-dmx-values.js';
 
-module.exports.name = `ColorSource`;
-module.exports.version = `0.1.0`;
+export const version = `0.1.0`;
 
 const EDITOR_VERSION = `1.1.1.9.0.4`;
 
@@ -30,7 +27,7 @@ const UUID_NAMESPACE = `0de81b51-02b2-45e3-b53c-578f9eb31b77`; // seed for UUIDs
  * @param {Date|null} options.date The current time.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = function exportColorSource(fixtures, options) {
+export async function exportFixtures(fixtures, options) {
   const exportJson = {
     date: options.date.toISOString().replace(/\.\d{3}Z$/, `Z`),
     editorVersion: EDITOR_VERSION,
@@ -69,7 +66,7 @@ module.exports.exportFixtures = function exportColorSource(fixtures, options) {
     mimetype: `application/json`,
     fixtures,
   }]);
-};
+}
 
 /**
  * @param {Array.<Object>} colorSourceChannels A ColorSource fixture's parameter property.
diff --git a/plugins/d-light/export.js b/plugins/d-light/export.js
index 1d36a30fa7..34c33b648d 100644
--- a/plugins/d-light/export.js
+++ b/plugins/d-light/export.js
@@ -1,25 +1,25 @@
-const xmlbuilder = require(`xmlbuilder`);
-const sanitize = require(`sanitize-filename`);
+import xmlbuilder from 'xmlbuilder';
+import sanitize from 'sanitize-filename';
 
 /** @typedef {import('../../lib/model/AbstractChannel.js').default} AbstractChannel */
 /** @typedef {import('../../lib/model/Capability.js').default} Capability */
-const { CoarseChannel } = require(`../../lib/model.js`);
-const { FineChannel } = require(`../../lib/model.js`);
+import { CoarseChannel } from '../../lib/model.js';
+import { FineChannel } from '../../lib/model.js';
 /** @typedef {import('../../lib/model/Fixture.js').default} Fixture */
 /** @typedef {import('../../lib/model/Mode.js').default} Mode */
-const { SwitchingChannel } = require(`../../lib/model.js`);
+import { SwitchingChannel } from '../../lib/model.js';
 
-module.exports.version = `0.2.0`;
+export const version = `0.2.0`;
 
 /**
  * @param {Array.<Fixture>} fixtures An array of Fixture objects.
  * @param {Object} options Global options, including:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory.
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = async function exportDLight(fixtures, options) {
+export async function exportFixtures(fixtures, options) {
   const deviceFiles = [];
 
   for (const fixture of fixtures) {
@@ -30,7 +30,7 @@ module.exports.exportFixtures = async function exportDLight(fixtures, options) {
         .element({
           Device: {
             'OFL_Export': {
-              '@id': options.displayedPluginVersion || module.exports.version,
+              '@id': options.displayedPluginVersion || version,
               '#text': fixture.url,
             },
             frames: {
@@ -63,7 +63,7 @@ module.exports.exportFixtures = async function exportDLight(fixtures, options) {
   }
 
   return deviceFiles;
-};
+}
 
 /**
  * Channels are grouped in attributes in D::Light.
diff --git a/plugins/d-light/exportTests/attributes-correctness.js b/plugins/d-light/exportTests/attributes-correctness.js
index 967d895395..c8ab2bebf8 100644
--- a/plugins/d-light/exportTests/attributes-correctness.js
+++ b/plugins/d-light/exportTests/attributes-correctness.js
@@ -1,4 +1,4 @@
-const xml2js = require(`xml2js`);
+import xml2js from 'xml2js';
 
 /**
  * @typedef {Object} ExportFile
@@ -14,7 +14,7 @@ const xml2js = require(`xml2js`);
  * @param {Array.<ExportFile>} allExportFiles An array of all export files.
  * @returns {Promise.<undefined, Array.<String>|String>} Resolve when the test passes or reject with an array of errors or one error if the test fails.
  */
-module.exports = async function testAttributesCorrectness(exportFile, allExportFiles) {
+export default async function testAttributesCorrectness(exportFile, allExportFiles) {
   try {
     const xml = await xml2js.parseStringPromise(exportFile.content);
     const errors = [];
@@ -42,4 +42,4 @@ module.exports = async function testAttributesCorrectness(exportFile, allExportF
   catch (parseError) {
     throw `Error parsing XML: ${parseError.toString()}`;
   }
-};
+}
diff --git a/plugins/dragonframe/export.js b/plugins/dragonframe/export.js
index af0281696f..4ac07b347b 100644
--- a/plugins/dragonframe/export.js
+++ b/plugins/dragonframe/export.js
@@ -1,22 +1,22 @@
-const fixtureJsonStringify = require(`../../lib/fixture-json-stringify.js`);
-const importJson = require(`../../lib/import-json.js`);
+import fixtureJsonStringify from '../../lib/fixture-json-stringify.js';
+import importJson from '../../lib/import-json.js';
 
 /** @typedef {import('../../lib/model/Fixture.js').default} Fixture */
 
 // needed for export test
-module.exports.supportedOflVersion = `12.2.1`;
+export const supportedOflVersion = `12.2.1`;
 
-module.exports.version = `1.0.0`;
+export const version = `1.0.0`;
 
 /**
  * @param {Array.<Fixture>} fixtures An array of Fixture objects.
  * @param {Object} options Global options, including:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory.
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = async function exportDragonframe(fixtures, options) {
+export async function exportFixtures(fixtures, options) {
   const usedManufacturers = new Set();
 
   // one JSON file for each fixture
@@ -25,7 +25,7 @@ module.exports.exportFixtures = async function exportDragonframe(fixtures, optio
 
 
     const jsonData = JSON.parse(JSON.stringify(fixture.jsonObject));
-    jsonData.$schema = `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/schema-${module.exports.supportedOflVersion}/schemas/fixture.json`;
+    jsonData.$schema = `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/schema-${supportedOflVersion}/schemas/fixture.json`;
 
     jsonData.fixtureKey = fixture.key;
     jsonData.manufacturerKey = fixture.manufacturer.key;
@@ -39,11 +39,11 @@ module.exports.exportFixtures = async function exportDragonframe(fixtures, optio
     };
   });
 
-  const manufacturers = await importJson(`../../fixtures/manufacturers.json`, __dirname);
+  const manufacturers = await importJson(`../../fixtures/manufacturers.json`, import.meta.url);
 
   // manufacturers.json file
   const usedManufacturerData = {
-    $schema: `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/schema-${module.exports.supportedOflVersion}/schemas/manufacturers.json`,
+    $schema: `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/schema-${supportedOflVersion}/schemas/manufacturers.json`,
   };
   for (const manufacturer of Object.keys(manufacturers).sort()) {
     if (usedManufacturers.has(manufacturer)) {
@@ -57,4 +57,4 @@ module.exports.exportFixtures = async function exportDragonframe(fixtures, optio
   });
 
   return files;
-};
+}
diff --git a/plugins/dragonframe/exportTests/json-schema-conformity.js b/plugins/dragonframe/exportTests/json-schema-conformity.js
index 6c724597f1..8b77c272ea 100644
--- a/plugins/dragonframe/exportTests/json-schema-conformity.js
+++ b/plugins/dragonframe/exportTests/json-schema-conformity.js
@@ -1,9 +1,9 @@
-const https = require(`https`);
-const Ajv = require(`ajv`);
-const addFormats = require(`ajv-formats`);
-const getAjvErrorMessages = require(`../../../lib/get-ajv-error-messages.js`);
+import https from 'https';
+import Ajv from 'ajv';
+import addFormats from 'ajv-formats';
+import getAjvErrorMessages from '../../../lib/get-ajv-error-messages.js';
 
-const SUPPORTED_OFL_VERSION = require(`../export.js`).supportedOflVersion;
+import { supportedOflVersion as SUPPORTED_OFL_VERSION } from '../export.js';
 const REPO_BASE_URL = `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library`;
 const SCHEMA_BASE_URL = `${REPO_BASE_URL}/schema-${SUPPORTED_OFL_VERSION}/schemas/`;
 const SCHEMA_FILES = [
@@ -34,7 +34,7 @@ const schemaPromises = getSchemas();
  * @param {Array.<ExportFile>} allExportFiles An array of all export files.
  * @returns {Promise.<undefined, Array.<String>|String>} Resolve when the test passes or reject with an array of errors or one error if the test fails.
  */
-module.exports = async function testJsonSchemaConformity(exportFile, allExportFiles) {
+export default async function testJsonSchemaConformity(exportFile, allExportFiles) {
   const schemas = await schemaPromises;
   const ajv = new Ajv({
     schemas,
@@ -51,7 +51,7 @@ module.exports = async function testJsonSchemaConformity(exportFile, allExportFi
   if (!schemaValid) {
     throw getAjvErrorMessages(schemaValidate.errors, `fixture`);
   }
-};
+}
 
 /**
  * @returns {Promise.<Array.<Object>>} Asynchronously downloaded and JSON parsed schemas.
diff --git a/plugins/ecue/export.js b/plugins/ecue/export.js
index 29015629f5..f97f992af4 100644
--- a/plugins/ecue/export.js
+++ b/plugins/ecue/export.js
@@ -1,24 +1,24 @@
-const xmlbuilder = require(`xmlbuilder`);
+import xmlbuilder from 'xmlbuilder';
 
-const { CoarseChannel } = require(`../../lib/model.js`);
-const { FineChannel } = require(`../../lib/model.js`);
+import { CoarseChannel } from '../../lib/model.js';
+import { FineChannel } from '../../lib/model.js';
 /** @typedef {import('../../lib/model/Fixture.js').default} Fixture */
 /** @typedef {import('../../lib/model/Mode.js').default} Mode */
-const { NullChannel } = require(`../../lib/model.js`);
-const { Physical } = require(`../../lib/model.js`);
-const { SwitchingChannel } = require(`../../lib/model.js`);
+import { NullChannel } from '../../lib/model.js';
+import { Physical } from '../../lib/model.js';
+import { SwitchingChannel } from '../../lib/model.js';
 
-module.exports.version = `0.3.0`;
+export const version = `0.3.0`;
 
 /**
  * @param {Array.<Fixture>} fixtures An array of Fixture objects.
  * @param {Object} options Global options, including:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory.
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = async function exportECue(fixtures, options) {
+export async function exportFixtures(fixtures, options) {
   const timestamp = dateToString(options.date);
 
   const manufacturers = {};
@@ -83,7 +83,7 @@ module.exports.exportFixtures = async function exportECue(fixtures, options) {
     mimetype: `application/xml`,
     fixtures,
   }];
-};
+}
 
 /**
  * @param {Object} xmlManufacturer The xmlbuilder <Manufacturer> object.
diff --git a/plugins/ecue/import.js b/plugins/ecue/import.js
index c1c01b9bac..e4b60aeb95 100644
--- a/plugins/ecue/import.js
+++ b/plugins/ecue/import.js
@@ -1,7 +1,7 @@
-const colorNameList = require(`color-name-list`);
-const xml2js = require(`xml2js`);
+import colorNameList from 'color-name-list/dist/colornames.esm.mjs';
+import xml2js from 'xml2js';
 
-module.exports.version = `0.3.1`;
+export const version = `0.3.1`;
 
 const colors = {};
 for (const color of colorNameList) {
@@ -14,7 +14,7 @@ for (const color of colorNameList) {
  * @param {String} authorName The importer's name.
  * @returns {Promise.<Object, Error>} A Promise resolving to an out object
  */
-module.exports.importFixtures = async function importECue(buffer, filename, authorName) {
+export async function importFixtures(buffer, filename, authorName) {
   const timestamp = new Date().toISOString().replace(/T.*/, ``);
 
   const out = {
@@ -124,7 +124,7 @@ module.exports.importFixtures = async function importECue(buffer, filename, auth
 
     out.fixtures[fixtureKey] = fixture;
   }
-};
+}
 
 /**
  * @param {Object} ecueFixture The e:cue fixture object.
diff --git a/plugins/gdtf/deprecated-gdtf-attributes.js b/plugins/gdtf/deprecated-gdtf-attributes.js
index 117061b353..dbb0b33a33 100644
--- a/plugins/gdtf/deprecated-gdtf-attributes.js
+++ b/plugins/gdtf/deprecated-gdtf-attributes.js
@@ -1,4 +1,4 @@
-const { normalizeAngularSpeedDirection } = require(`./gdtf-helpers.js`);
+import { normalizeAngularSpeedDirection } from './gdtf-helpers.js';
 
 const deprecatedGdtfAttributes = {
   ActiveZone: undefined, // From https://gitlab.com/petrvanek/gdtf-libraries/blob/master/gdtf.xsd
@@ -525,4 +525,4 @@ function guessColorComponentName(gdtfCapability, primaryColor, secondaryColor) {
   return primaryColor;
 }
 
-module.exports = deprecatedGdtfAttributes;
+export default deprecatedGdtfAttributes;
diff --git a/plugins/gdtf/gdtf-attributes.js b/plugins/gdtf/gdtf-attributes.js
index 44f18564f8..155772706a 100644
--- a/plugins/gdtf/gdtf-attributes.js
+++ b/plugins/gdtf/gdtf-attributes.js
@@ -1,12 +1,12 @@
-const {
+import {
   followXmlNodeReference,
   getRgbColorFromGdtfColor,
   normalizeAngularSpeedDirection,
-} = require(`./gdtf-helpers.js`);
-const deprecatedGdtfAttributes = require(`./deprecated-gdtf-attributes.js`);
+} from './gdtf-helpers.js';
+import deprecatedGdtfAttributes from './deprecated-gdtf-attributes.js';
 
 // see https://gdtf-share.com/wiki/GDTF_File_Description#Attribute
-const gdtfUnits = {
+export const gdtfUnits = {
   None(value) {
     return value;
   },
@@ -1250,7 +1250,7 @@ function guessSpeedOrDuration(gdtfCapability) {
   return gdtfCapability._channelFunction._attribute.$.PhysicalUnit === `Time` ? `duration` : `speed`;
 }
 
-module.exports = {
-  gdtfUnits,
-  gdtfAttributes: Object.assign({}, deprecatedGdtfAttributes, gdtfAttributes),
+export default {
+  ...deprecatedGdtfAttributes,
+  ...gdtfAttributes,
 };
diff --git a/plugins/gdtf/gdtf-helpers.js b/plugins/gdtf/gdtf-helpers.js
index 68615a8f06..817a16d0b1 100644
--- a/plugins/gdtf/gdtf-helpers.js
+++ b/plugins/gdtf/gdtf-helpers.js
@@ -3,7 +3,7 @@
  * @param {String} nodeReference A string of the form "Name.Name.Name…", see https://gdtf-share.com/wiki/GDTF_File_Description#attrType-node
  * @returns {Object|null} The referenced XML node object, or null if it could not be found.
  */
-function followXmlNodeReference(startNode, nodeReference) {
+export function followXmlNodeReference(startNode, nodeReference) {
   if (!startNode || !nodeReference) {
     return null;
   }
@@ -45,7 +45,7 @@ function followXmlNodeReference(startNode, nodeReference) {
  * @param {String} gdtfColorString A string in the form "0.3127, 0.3290, 100.0", see https://gdtf-share.com/wiki/GDTF_File_Description#attrType-colorCIE
  * @returns {String} The RGB hex code string in the form "#rrggbb".
  */
-function getRgbColorFromGdtfColor(gdtfColorString) {
+export function getRgbColorFromGdtfColor(gdtfColorString) {
   /* eslint-disable camelcase, space-in-parens, unicorn/no-zero-fractions */
 
   // functions ported from https://github.com/njsmith/colorspacious
@@ -119,7 +119,7 @@ function getRgbColorFromGdtfColor(gdtfColorString) {
 /**
  * @param {Object} gdtfCapability The enhanced <ChannelSet> XML object.
  */
-function normalizeAngularSpeedDirection(gdtfCapability) {
+export function normalizeAngularSpeedDirection(gdtfCapability) {
   if (/CCW|counter[\s-]*clockwise/.test(gdtfCapability.$.Name)) {
     gdtfCapability._physicalFrom = -Math.abs(gdtfCapability._physicalFrom);
     gdtfCapability._physicalTo = -Math.abs(gdtfCapability._physicalTo);
@@ -129,9 +129,3 @@ function normalizeAngularSpeedDirection(gdtfCapability) {
     gdtfCapability._physicalTo = Math.abs(gdtfCapability._physicalTo);
   }
 }
-
-module.exports = {
-  followXmlNodeReference,
-  getRgbColorFromGdtfColor,
-  normalizeAngularSpeedDirection,
-};
diff --git a/plugins/gdtf/import.js b/plugins/gdtf/import.js
index 8dfffd9f71..5387f6d0c1 100644
--- a/plugins/gdtf/import.js
+++ b/plugins/gdtf/import.js
@@ -1,16 +1,13 @@
-const xml2js = require(`xml2js`);
-const JSZip = require(`jszip`);
+import xml2js from 'xml2js';
+import JSZip from 'jszip';
 
-// see https://github.com/standard-things/esm#getting-started
-require = require(`esm`)(module); // eslint-disable-line no-global-assign
+import { CoarseChannel } from '../../lib/model.js';
+import { scaleDmxValue, scaleDmxRangeIndividually } from '../../lib/scale-dmx-values.js';
+import importJson from '../../lib/import-json.js';
+import gdtfAttributes, { gdtfUnits } from './gdtf-attributes.js';
+import { getRgbColorFromGdtfColor, followXmlNodeReference } from './gdtf-helpers.js';
 
-const { CoarseChannel } = require(`../../lib/model.js`);
-const { scaleDmxValue, scaleDmxRangeIndividually } = require(`../../lib/scale-dmx-values.js`);
-const importJson = require(`../../lib/import-json.js`);
-const { gdtfAttributes, gdtfUnits } = require(`./gdtf-attributes.js`);
-const { getRgbColorFromGdtfColor, followXmlNodeReference } = require(`./gdtf-helpers.js`);
-
-module.exports.version = `0.2.0`;
+export const version = `0.2.0`;
 
 /**
  * @param {Buffer} buffer The imported file.
@@ -18,7 +15,7 @@ module.exports.version = `0.2.0`;
  * @param {String} authorName The importer's name.
  * @returns {Promise.<Object, Error>} A Promise resolving to an out object
  */
-module.exports.importFixtures = async function importGdtf(buffer, filename, authorName) {
+export async function importFixtures(buffer, filename, authorName) {
   const fixture = {
     $schema: `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/master/schemas/fixture.json`,
   };
@@ -48,7 +45,7 @@ module.exports.importFixtures = async function importGdtf(buffer, filename, auth
   const manufacturerKey = slugify(gdtfFixture.$.Manufacturer);
   const fixtureKey = `${manufacturerKey}/${slugify(fixture.name)}`;
 
-  const manufacturers = await importJson(`../../fixtures/manufacturers.json`, __dirname);
+  const manufacturers = await importJson(`../../fixtures/manufacturers.json`, import.meta.url);
 
   let manufacturer;
   if (manufacturerKey in manufacturers) {
@@ -1254,7 +1251,7 @@ module.exports.importFixtures = async function importGdtf(buffer, filename, auth
       return CoarseChannel.RESOLUTION_8BIT;
     }
   }
-};
+}
 
 
 /**
diff --git a/plugins/millumin/export.js b/plugins/millumin/export.js
index e325b22da9..fb8f58da54 100644
--- a/plugins/millumin/export.js
+++ b/plugins/millumin/export.js
@@ -1,28 +1,28 @@
-const fixtureJsonStringify = require(`../../lib/fixture-json-stringify.js`);
+import fixtureJsonStringify from '../../lib/fixture-json-stringify.js';
 
-const { CoarseChannel } = require(`../../lib/model.js`);
+import { CoarseChannel } from '../../lib/model.js';
 /** @typedef {import('../../lib/model/Fixture.js').default} Fixture */
 
-module.exports.version = `0.4.0`;
+export const version = `0.4.0`;
 
 // needed for export test
-module.exports.supportedOflVersion = `7.3.0`;
+export const supportedOflVersion = `7.3.0`;
 
 /**
  * @param {Array.<Fixture>} fixtures An array of Fixture objects.
  * @param {Object} options Global options, including:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory.
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = async function exportMillumin(fixtures, options) {
+export async function exportFixtures(fixtures, options) {
   // one JSON file for each fixture
   const outFiles = fixtures.map(fixture => {
     const oflJson = JSON.parse(JSON.stringify(fixture.jsonObject));
     const milluminJson = {};
 
-    milluminJson.$schema = `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/schema-${module.exports.supportedOflVersion}/schemas/fixture.json`;
+    milluminJson.$schema = `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/schema-${supportedOflVersion}/schemas/fixture.json`;
     milluminJson.name = oflJson.name;
     addIfValidData(milluminJson, `shortName`, oflJson.shortName);
     milluminJson.categories = getDowngradedCategories(oflJson.categories);
@@ -67,7 +67,7 @@ module.exports.exportFixtures = async function exportMillumin(fixtures, options)
   });
 
   return outFiles;
-};
+}
 
 /**
  * Replaces the fixture's categories array with one that only includes categories
diff --git a/plugins/millumin/exportTests/json-schema-conformity.js b/plugins/millumin/exportTests/json-schema-conformity.js
index 4c7c25e50c..a82d184da0 100644
--- a/plugins/millumin/exportTests/json-schema-conformity.js
+++ b/plugins/millumin/exportTests/json-schema-conformity.js
@@ -1,9 +1,9 @@
-const https = require(`https`);
-const Ajv = require(`ajv`);
-const addFormats = require(`ajv-formats`);
-const getAjvErrorMessages = require(`../../../lib/get-ajv-error-messages.js`);
+import https from 'https';
+import Ajv from 'ajv';
+import addFormats from 'ajv-formats';
+import getAjvErrorMessages from '../../../lib/get-ajv-error-messages.js';
 
-const SUPPORTED_OFL_VERSION = require(`../export.js`).supportedOflVersion;
+import { supportedOflVersion as SUPPORTED_OFL_VERSION } from '../export.js';
 const SCHEMA_BASE_URL = `https://raw.githubusercontent.com/OpenLightingProject/open-fixture-library/schema-${SUPPORTED_OFL_VERSION}/schemas/`;
 const SCHEMA_FILES = [`capability.json`, `channel.json`, `definitions.json`, `fixture.json`];
 
@@ -23,7 +23,7 @@ const schemaPromises = getSchemas();
  * @param {Array.<ExportFile>} allExportFiles An array of all export files.
  * @returns {Promise.<undefined, Array.<String>|String>} Resolve when the test passes or reject with an array of errors or one error if the test fails.
  */
-module.exports = async function testSchemaConformity(exportFile, allExportFiles) {
+export default async function testSchemaConformity(exportFile, allExportFiles) {
   const schemas = await schemaPromises;
   const ajv = new Ajv({
     schemas,
@@ -39,7 +39,7 @@ module.exports = async function testSchemaConformity(exportFile, allExportFiles)
   if (!schemaValid) {
     throw getAjvErrorMessages(schemaValidate.errors, `fixture`);
   }
-};
+}
 
 /**
  * @returns {Promise.<Array.<Object>>} Asynchronously downloaded and JSON parsed schemas. Already tweaked to handle Millumin's deviations from the supported schema version.
diff --git a/plugins/ofl/export.js b/plugins/ofl/export.js
index 69d2a396fb..579c67f0ab 100644
--- a/plugins/ofl/export.js
+++ b/plugins/ofl/export.js
@@ -1,20 +1,21 @@
-const fixtureJsonStringify = require(`../../lib/fixture-json-stringify.js`);
-const importJson = require(`../../lib/import-json.js`);
+import fixtureJsonStringify from '../../lib/fixture-json-stringify.js';
+import importJson from '../../lib/import-json.js';
 
 /** @typedef {import('../../lib/model/Fixture.js').default} Fixture */
 
-module.exports.version = require(`../../schemas/fixture.json`).version;
+import { fixtureSchema } from '../../lib/esm-shim.cjs';
+export const version = fixtureSchema.version;
 
 /**
  * @param {Array.<Fixture>} fixtures An array of Fixture objects.
  * @param {Object} options Global options, including:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory.
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = async function exportOfl(fixtures, options) {
-  const displayedPluginVersion = options.displayedPluginVersion || module.exports.version;
+export async function exportFixtures(fixtures, options) {
+  const displayedPluginVersion = options.displayedPluginVersion || version;
 
   const usedManufacturers = new Set();
 
@@ -38,7 +39,7 @@ module.exports.exportFixtures = async function exportOfl(fixtures, options) {
     };
   });
 
-  const manufacturers = await importJson(`../../fixtures/manufacturers.json`, __dirname);
+  const manufacturers = await importJson(`../../fixtures/manufacturers.json`, import.meta.url);
 
   // manufacturers.json file
   const usedManufacturerData = {
@@ -56,4 +57,4 @@ module.exports.exportFixtures = async function exportOfl(fixtures, options) {
   });
 
   return files;
-};
+}
diff --git a/plugins/op-z/export.js b/plugins/op-z/export.js
index cc2e43bf71..9a78b2b556 100644
--- a/plugins/op-z/export.js
+++ b/plugins/op-z/export.js
@@ -1,11 +1,11 @@
 /** @typedef {import('../../lib/model/AbstractChannel.js').default} AbstractChannel */
-const { CoarseChannel } = require(`../../lib/model.js`);
-const { FineChannel } = require(`../../lib/model.js`);
+import { CoarseChannel } from '../../lib/model.js';
+import { FineChannel } from '../../lib/model.js';
 /** @typedef {import('../../lib/model/Fixture.js').default} Fixture */
-const { NullChannel } = require(`../../lib/model.js`);
-const { SwitchingChannel } = require(`../../lib/model.js`);
+import { NullChannel } from '../../lib/model.js';
+import { SwitchingChannel } from '../../lib/model.js';
 
-module.exports.version = `0.1.0`;
+export const version = `0.1.0`;
 
 const MAX_KNOBS = 8;
 const MAX_OPZ_FIXTURES = 16;
@@ -15,10 +15,10 @@ const MAX_OPZ_FIXTURES = 16;
  * @param {Object} options Global options, including:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory.
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = async function exportOpZ(fixtures, options) {
+export async function exportFixtures(fixtures, options) {
   const exportJson = {
     profiles: [],
     config: [],
@@ -127,4 +127,4 @@ module.exports.exportFixtures = async function exportOpZ(fixtures, options) {
       return null;
     }
   }
-};
+}
diff --git a/plugins/qlcplus_4.12.2/export.js b/plugins/qlcplus_4.12.2/export.js
index 1817c14ca5..4b7e6773ad 100644
--- a/plugins/qlcplus_4.12.2/export.js
+++ b/plugins/qlcplus_4.12.2/export.js
@@ -1,33 +1,33 @@
-const xmlbuilder = require(`xmlbuilder`);
-const sanitize = require(`sanitize-filename`);
+import xmlbuilder from 'xmlbuilder';
+import sanitize from 'sanitize-filename';
 
-const {
+import {
   getChannelPreset,
   getFineChannelPreset,
   getCapabilityPreset,
   exportHelpers,
-} = require(`./presets.js`);
+} from './presets.js';
 
 /** @typedef {import('../../lib/model/AbstractChannel.js').default} AbstractChannel */
-const { Capability } = require(`../../lib/model.js`);
-const { CoarseChannel } = require(`../../lib/model.js`);
+import { Capability } from '../../lib/model.js';
+import { CoarseChannel } from '../../lib/model.js';
 /** @typedef {import('../../lib/model/FineChannel.js').default} FineChannel */
 /** @typedef {import('../../lib/model/Fixture.js').default} Fixture */
 /** @typedef {import('../../lib/model/Mode.js').default} Mode */
-const { Physical } = require(`../../lib/model.js`);
-const { SwitchingChannel } = require(`../../lib/model.js`);
+import { Physical } from '../../lib/model.js';
+import { SwitchingChannel } from '../../lib/model.js';
 
-module.exports.version = `1.3.0`;
+export const version = `1.3.0`;
 
 /**
  * @param {Array.<Fixture>} fixtures An array of Fixture objects.
  * @param {Object} options Global options, including:
  * @param {String} options.baseDirectory Absolute path to OFL's root directory.
  * @param {Date} options.date The current time.
- * @param {String|undefined} options.displayedPluginVersion Replacement for module.exports.version if the plugin version is used in export.
+ * @param {String|undefined} options.displayedPluginVersion Replacement for plugin version if the plugin version is used in export.
  * @returns {Promise.<Array.<Object>, Error>} The generated files.
  */
-module.exports.exportFixtures = async function exportQlcPlus(fixtures, options) {
+export async function exportFixtures(fixtures, options) {
   const customGobos = {};
 
   const outFiles = await Promise.all(fixtures.map(async fixture => {
@@ -38,7 +38,7 @@ module.exports.exportFixtures = async function exportQlcPlus(fixtures, options)
           '@xmlns': `http://www.qlcplus.org/FixtureDefinition`,
           Creator: {
             Name: `OFL – ${fixture.url}`,
-            Version: options.displayedPluginVersion || module.exports.version,
+            Version: options.displayedPluginVersion || version,
             Author: fixture.meta.authors.join(`, `),
           },
           Manufacturer: fixture.manufacturer.name,
@@ -99,7 +99,7 @@ module.exports.exportFixtures = async function exportQlcPlus(fixtures, options)
   }
 
   return outFiles;
-};
+}
 
 /**
  * @param {Object} xml The xmlbuilder <FixtureDefinition> object.
diff --git a/plugins/qlcplus_4.12.2/exportTests/fixture-tool-validation.js b/plugins/qlcplus_4.12.2/exportTests/fixture-tool-validation.js
index b372a4a00c..e280e3c7a0 100644
--- a/plugins/qlcplus_4.12.2/exportTests/fixture-tool-validation.js
+++ b/plugins/qlcplus_4.12.2/exportTests/fixture-tool-validation.js
@@ -1,11 +1,12 @@
-const https = require(`https`);
-const path = require(`path`);
-const { mkdir, mkdtemp, writeFile } = require(`fs/promises`);
-const os = require(`os`);
-const execFile = require(`util`).promisify(require(`child_process`).execFile);
-
-const importJson = require(`../../../lib/import-json.js`);
+import https from 'https';
+import path from 'path';
+import { mkdir, mkdtemp, writeFile } from 'fs/promises';
+import os from 'os';
+import { promisify } from 'util';
+import { execFile as execFileAsync } from 'child_process';
+import importJson from '../../../lib/import-json.js';
 
+const execFile = promisify(execFileAsync);
 
 const FIXTURE_TOOL_URL = `https://raw.githubusercontent.com/mcallegari/qlcplus/master/resources/fixtures/scripts/fixtures-tool.py`;
 const FIXTURE_TOOL_DIR_PREFIX = path.join(os.tmpdir(), `ofl-qlcplus5-fixture-tool-`);
@@ -26,7 +27,7 @@ const EXPORTED_FIXTURE_PATH = `resources/fixtures/manufacturer/fixture.qxf`;
  * @param {Array.<ExportFile>} allExportFiles An array of all export files.
  * @returns {Promise.<undefined, Array.<String>|String>} Resolve when the test passes or reject with an array of errors or one error if the test fails.
  */
-module.exports = async function testFixtureToolValidation(exportFile, allExportFiles) {
+export default async function testFixtureToolValidation(exportFile, allExportFiles) {
   if (exportFile.name.startsWith(`gobos/`)) {
     return;
   }
@@ -43,7 +44,7 @@ module.exports = async function testFixtureToolValidation(exportFile, allExportF
   await writeFile(path.join(directory, EXPORTED_FIXTURE_PATH), exportFile.content);
 
   // store used gobos in the gobos/ directory
-  const qlcplusGoboAliases = await importJson(`../../../resources/gobos/aliases/qlcplus.json`, __dirname);
+  const qlcplusGoboAliases = await importJson(`../../../resources/gobos/aliases/qlcplus.json`, import.meta.url);
   const qlcplusGobos = [`gobos/Others/open.svg`, `gobos/Others/rainbow.png`].concat(
     Object.keys(qlcplusGoboAliases).map(gobo => `gobos/${gobo}`),
     allExportFiles.filter(file => file.name.startsWith(`gobos/`)).map(file => file.name),
@@ -67,7 +68,7 @@ module.exports = async function testFixtureToolValidation(exportFile, allExportF
   if (lastLine !== `1 definitions processed. 0 errors detected`) {
     throw output.stdout;
   }
-};
+}
 
 
 /**
diff --git a/plugins/qlcplus_4.12.2/exportTests/xsd-schema-conformity.js b/plugins/qlcplus_4.12.2/exportTests/xsd-schema-conformity.js
index 9b179f5efb..ef06cb0256 100644
--- a/plugins/qlcplus_4.12.2/exportTests/xsd-schema-conformity.js
+++ b/plugins/qlcplus_4.12.2/exportTests/xsd-schema-conformity.js
@@ -1,5 +1,5 @@
-const https = require(`https`);
-const libxml = require(`libxmljs`);
+import https from 'https';
+import libxml from 'libxmljs';
 
 const SCHEMA_URL = `https://raw.githubusercontent.com/mcallegari/qlcplus/master/resources/schemas/fixture.xsd`;
 
@@ -17,7 +17,7 @@ const SCHEMA_URL = `https://raw.githubusercontent.com/mcallegari/qlcplus/master/
  * @param {Array.<ExportFile>} allExportFiles An array of all export files.
  * @returns {Promise.<undefined, Array.<String>|String>} Resolve when the test passes or reject with an array of errors or one error if the test fails.
  */
-module.exports = async function testSchemaConformity(exportFile, allExportFiles) {
+export default async function testSchemaConformity(exportFile, allExportFiles) {
   if (exportFile.name.startsWith(`gobos/`)) {
     return;
   }
@@ -42,4 +42,4 @@ module.exports = async function testSchemaConformity(exportFile, allExportFiles)
   }
 
   throw xmlDocument.validationErrors.map(error => error.message.trim());
-};
+}
diff --git a/plugins/qlcplus_4.12.2/import.js b/plugins/qlcplus_4.12.2/import.js
index 3f16f1978f..1a01ad134b 100644
--- a/plugins/qlcplus_4.12.2/import.js
+++ b/plugins/qlcplus_4.12.2/import.js
@@ -1,17 +1,17 @@
-const xml2js = require(`xml2js`);
+import xml2js from 'xml2js';
 
-const importJson = require(`../../lib/import-json.js`);
+import importJson from '../../lib/import-json.js';
 
-const qlcplusGoboAliasesPromise = importJson(`../../resources/gobos/aliases/qlcplus.json`, __dirname);
+const qlcplusGoboAliasesPromise = importJson(`../../resources/gobos/aliases/qlcplus.json`, import.meta.url);
 
-const {
+import {
   getCapabilityFromChannelPreset,
   getCapabilityFromCapabilityPreset,
   capabilityPresets,
   importHelpers,
-} = require(`./presets.js`);
+} from './presets.js';
 
-module.exports.version = `1.1.0`;
+export const version = `1.1.0`;
 
 /**
  * @param {Buffer} buffer The imported file.
@@ -19,7 +19,7 @@ module.exports.version = `1.1.0`;
  * @param {String} authorName The importer's name.
  * @returns {Promise.<Object, Error>} A Promise resolving to an out object
  */
-module.exports.importFixtures = async function importQlcPlus(buffer, filename, authorName) {
+export async function importFixtures(buffer, filename, authorName) {
   const timestamp = new Date().toISOString().replace(/T.*/, ``);
 
   const warnings = [];
@@ -36,7 +36,7 @@ module.exports.importFixtures = async function importQlcPlus(buffer, filename, a
   const manufacturerKey = slugify(qlcPlusFixture.Manufacturer[0]);
   const fixtureKey = `${manufacturerKey}/${slugify(fixture.name)}`;
 
-  const oflManufacturers = await importJson(`../../fixtures/manufacturers.json`, __dirname);
+  const oflManufacturers = await importJson(`../../fixtures/manufacturers.json`, import.meta.url);
 
   const manufacturers = {};
   if (!(manufacturerKey in oflManufacturers)) {
@@ -99,7 +99,7 @@ module.exports.importFixtures = async function importQlcPlus(buffer, filename, a
       [fixtureKey]: warnings,
     },
   };
-};
+}
 
 /**
  * @param {Object} qlcPlusFixture The QLC+ fixture object.
@@ -176,7 +176,7 @@ const slotTypeFunctions = {
         if (goboKey) {
           slot.resource = `gobos/${goboKey}`;
 
-          const resource = await importJson(`../../resources/gobos/${goboKey}.json`, __dirname);
+          const resource = await importJson(`../../resources/gobos/${goboKey}.json`, import.meta.url);
 
           if (resource.name === capability._) {
             useResourceName = true;
diff --git a/plugins/qlcplus_4.12.2/presets.js b/plugins/qlcplus_4.12.2/presets.js
index a471a9a22c..d631d2b729 100644
--- a/plugins/qlcplus_4.12.2/presets.js
+++ b/plugins/qlcplus_4.12.2/presets.js
@@ -2,14 +2,14 @@
  * @fileoverview Channel and capability presets, together with functions to export or import them.
  */
 
-const importJson = require(`../../lib/import-json.js`);
+import importJson from '../../lib/import-json.js';
 
-const qlcplusGoboAliasesPromise = importJson(`../../resources/gobos/aliases/qlcplus.json`, __dirname);
+const qlcplusGoboAliasesPromise = importJson(`../../resources/gobos/aliases/qlcplus.json`, import.meta.url);
 
 
 // ########## Helper functions ##########
 
-const exportHelpers = {
+export const exportHelpers = {
   isIncreasingSpeed: capability => capability.speed !== null && Math.abs(capability.speed[0].number) < Math.abs(capability.speed[1].number),
   isDecreasingSpeed: capability => capability.speed !== null && Math.abs(capability.speed[0].number) > Math.abs(capability.speed[1].number),
   isStopped: capability => capability.speed !== null && capability.speed[0].number === 0 && capability.speed[1].number === 0,
@@ -49,7 +49,7 @@ const exportHelpers = {
   },
 };
 
-const importHelpers = {
+export const importHelpers = {
   getColorIntensityCap: color => ({
     type: `ColorIntensity`,
     color,
@@ -215,7 +215,7 @@ const importHelpers = {
 
 // ########## Channel presets ##########
 
-const channelPresets = {
+export const channelPresets = {
   IntensityMasterDimmer: {
     isApplicable: capability => {
       const channel = capability._channel;
@@ -539,7 +539,7 @@ const channelPresets = {
  * @param {CoarseChannel} channel The OFL channel object.
  * @returns {String|null} The QLC+ channel preset name or null, if there is no suitable one.
  */
-function getChannelPreset(channel) {
+export function getChannelPreset(channel) {
   if (channel.capabilities.length > 1) {
     return null;
   }
@@ -556,7 +556,7 @@ function getChannelPreset(channel) {
  * @param {Number} tiltMax The maximum tilt angle, or 0.
  * @returns {Object} The OFL capability object.
  */
-function getCapabilityFromChannelPreset(preset, channelName, panMax, tiltMax) {
+export function getCapabilityFromChannelPreset(preset, channelName, panMax, tiltMax) {
   if (preset in channelPresets) {
     return channelPresets[preset].importCapability({
       channelName,
@@ -575,7 +575,7 @@ function getCapabilityFromChannelPreset(preset, channelName, panMax, tiltMax) {
 
 // ########## Fine channel presets ##########
 
-const fineChannelPresets = {
+export const fineChannelPresets = {
   IntensityMasterDimmerFine: {
     isApplicable: ({ coarseChannelPreset }) => coarseChannelPreset === `IntensityMasterDimmer`,
   },
@@ -668,7 +668,7 @@ const fineChannelPresets = {
  * @param {FineChannel} fineChannel The OFL fine channel object.
  * @returns {String|null} The QLC+ channel preset name or null, if there is no suitable one.
  */
-function getFineChannelPreset(fineChannel) {
+export function getFineChannelPreset(fineChannel) {
   const coarseChannel = fineChannel.coarseChannel;
   const coarseChannelPreset = getChannelPreset(coarseChannel);
 
@@ -684,7 +684,7 @@ function getFineChannelPreset(fineChannel) {
 
 // ########## Capability presets ##########
 
-const capabilityPresets = {
+export const capabilityPresets = {
 
   // shutter capabilities
 
@@ -1033,7 +1033,7 @@ const capabilityPresets = {
  * @param {Capability} capability The OFL capability object.
  * @returns {Promise.<CapabilityPreset|null>} A Promise that resolves to the QLC+ capability preset or null, if there is no suitable one.
  */
-async function getCapabilityPreset(capability) {
+export async function getCapabilityPreset(capability) {
   const foundPresetName = Object.keys(capabilityPresets).find(
     presetName => capabilityPresets[presetName].isApplicable(capability),
   );
@@ -1055,7 +1055,7 @@ async function getCapabilityPreset(capability) {
  * @param {Object} capabilityData Additional data about capability and channel.
  * @returns {Object} The OFL capability object.
  */
-function getCapabilityFromCapabilityPreset(preset, capabilityData) {
+export function getCapabilityFromCapabilityPreset(preset, capabilityData) {
   if (preset in capabilityPresets) {
     const capability = capabilityPresets[preset].importCapability(capabilityData);
 
@@ -1075,20 +1075,3 @@ function getCapabilityFromCapabilityPreset(preset, capabilityData) {
     helpWanted: `Unknown QLC+ capability preset ${preset}, Res1="${capabilityData.res1}", Res2="${capabilityData.res2}".`,
   };
 }
-
-
-module.exports = {
-  channelPresets,
-  getChannelPreset,
-  getCapabilityFromChannelPreset,
-
-  fineChannelPresets,
-  getFineChannelPreset,
-
-  capabilityPresets,
-  getCapabilityPreset,
-  getCapabilityFromCapabilityPreset,
-
-  importHelpers,
-  exportHelpers,
-};
diff --git a/tests/built-files-committed.js b/tests/built-files-committed.js
index 732873a271..7d9f4d71bd 100755
--- a/tests/built-files-committed.js
+++ b/tests/built-files-committed.js
@@ -1,10 +1,10 @@
 #!/usr/bin/env node
 
-const path = require(`path`);
-const chalk = require(`chalk`);
-const childProcess = require(`child_process`);
+import chalk from 'chalk';
+import childProcess from 'child_process';
+import { fileURLToPath } from 'url';
 
-const projectDirectory = path.join(__dirname, `..`);
+const projectDirectory = fileURLToPath(new URL(`../`, import.meta.url));
 
 try {
   childProcess.execSync(`npm run build`, {
diff --git a/tests/dmx-value-scaling.js b/tests/dmx-value-scaling.js
index c4abe40638..81a9472d04 100755
--- a/tests/dmx-value-scaling.js
+++ b/tests/dmx-value-scaling.js
@@ -1,13 +1,10 @@
 #!/usr/bin/env node
-const chalk = require(`chalk`);
+import chalk from 'chalk';
 
-// see https://github.com/standard-things/esm#getting-started
-require = require(`esm`)(module); // eslint-disable-line no-global-assign
-
-const {
+import {
   scaleDmxValue,
   scaleDmxRange,
-} = require(`../lib/scale-dmx-values.js`);
+} from '../lib/scale-dmx-values.js';
 
 
 let errorCount = 0;
diff --git a/tests/external-links.js b/tests/external-links.js
index 0afb928583..c2fd9aa970 100755
--- a/tests/external-links.js
+++ b/tests/external-links.js
@@ -1,18 +1,18 @@
 #!/usr/bin/env node
 
-const http = require(`http`);
-const https = require(`https`);
-const path = require(`path`);
-const chalk = require(`chalk`);
-const { Octokit } = require(`@octokit/rest`);
+import http from 'http';
+import https from 'https';
+import chalk from 'chalk';
+import userAgent from 'default-user-agent';
+import { Octokit } from '@octokit/rest';
 
-require(`../lib/load-env-file.js`);
+import '../lib/load-env-file.js';
 
-const USER_AGENT = require(`default-user-agent`)();
+const USER_AGENT = userAgent();
 const GITHUB_COMMENT_HEADING = `## Broken links update`;
 const TIMEOUT = 30_000;
 
-const SiteCrawler = require(`../lib/site-crawler.js`);
+import SiteCrawler from '../lib/site-crawler.js';
 
 const excludedUrls = [
   `https://open-fixture-library.org`, // exclude canonical URLs
@@ -368,8 +368,9 @@ async function updateGithubIssue(urlResults) {
    * @returns {String} The new issue body (in Markdown and HTML) from the given link data.
    */
   function getBodyFromLinkData(linkData) {
+    const scriptName = import.meta.url.split(`/`).slice(-2).join(`/`);
     const lines = [
-      `*Auto-generated content by \`${path.relative(path.join(__dirname, `..`), __filename)}\`.*`,
+      `*Auto-generated content by \`${scriptName}\`.*`,
       ``,
       `**Last updated:** ${new Date().toISOString()}`,
       ``,
diff --git a/tests/fixture-valid.js b/tests/fixture-valid.js
index a7c9b15611..7440fff9a3 100644
--- a/tests/fixture-valid.js
+++ b/tests/fixture-valid.js
@@ -1,25 +1,22 @@
-const { inspect } = require(`util`);
+import { inspect } from 'util';
 
-// see https://github.com/standard-things/esm#getting-started
-require = require(`esm`)(module); // eslint-disable-line no-global-assign
-
-const getAjvValidator = require(`../lib/ajv-validator.js`);
-const schemaProperties = require(`../lib/schema-properties.js`).default;
-const { manufacturerFromRepository, getResourceFromString } = require(`../lib/model.js`);
-const getAjvErrorMessages = require(`../lib/get-ajv-error-messages.js`);
-const importJson = require(`../lib/import-json.js`);
+import getAjvValidator from '../lib/ajv-validator.js';
+import schemaProperties from '../lib/schema-properties.js';
+import { manufacturerFromRepository, getResourceFromString } from '../lib/model.js';
+import getAjvErrorMessages from '../lib/get-ajv-error-messages.js';
+import importJson from '../lib/import-json.js';
 
 /** @typedef {import('../lib/model/AbstractChannel.js').default} AbstractChannel */
 /** @typedef {import('../lib/model/Capability.js').default} Capability */
 /** @typedef {import('../lib/model/CoarseChannel.js').default} CoarseChannel */
-const { FineChannel } = require(`../lib/model.js`);
-const { Fixture } = require(`../lib/model.js`);
+import { FineChannel } from '../lib/model.js';
+import { Fixture } from '../lib/model.js';
 /** @typedef {import('../lib/model/Matrix.js').default} Matrix */
 /** @typedef {import('../lib/model/Meta.js').default} Meta */
-const { NullChannel } = require(`../lib/model.js`);
+import { NullChannel } from '../lib/model.js';
 /** @typedef {import('../lib/model/Physical.js').default} Physical */
 /** @typedef {import('../lib/model/TemplateChannel.js').default} TemplateChannel */
-const { SwitchingChannel } = require(`../lib/model.js`);
+import { SwitchingChannel } from '../lib/model.js';
 /** @typedef {import('../lib/model/Wheel.js').default} Wheel */
 
 let initialized = false;
@@ -34,10 +31,10 @@ let plugins;
  * @param {UniqueValues|null} [uniqueValues=null] Values that have to be unique are checked and all new occurrences are appended.
  * @returns {Promise.<ResultData>} A Promise that resolves to the result object containing errors and warnings, if any.
  */
-async function checkFixture(manufacturerKey, fixtureKey, fixtureJson, uniqueValues = null) {
+export async function checkFixture(manufacturerKey, fixtureKey, fixtureJson, uniqueValues = null) {
   if (!initialized) {
-    register = await importJson(`../fixtures/register.json`, __dirname);
-    plugins = await importJson(`../plugins/plugins.json`, __dirname);
+    register = await importJson(`../fixtures/register.json`, import.meta.url);
+    plugins = await importJson(`../plugins/plugins.json`, import.meta.url);
 
     initialized = true;
   }
@@ -1192,7 +1189,7 @@ async function checkFixture(manufacturerKey, fixtureKey, fixtureJson, uniqueValu
  * @param {ResultData} result The object to add the error message to (if any).
  * @param {String} messageIfNotUnique If the value is not unique, add this message to errors.
  */
-function checkUniqueness(set, value, result, messageIfNotUnique) {
+export function checkUniqueness(set, value, result, messageIfNotUnique) {
   if (set.has(value.toLowerCase())) {
     result.errors.push(messageIfNotUnique);
   }
@@ -1205,7 +1202,7 @@ function checkUniqueness(set, value, result, messageIfNotUnique) {
  * @param {*} error An error object to append to the message.
  * @returns {String} A string containing the message and a deep inspection of the given error object.
  */
-function getErrorString(description, error) {
+export function getErrorString(description, error) {
   if (typeof error === `string`) {
     return `${description} ${error}`;
   }
@@ -1229,10 +1226,3 @@ function arraysEqual(a, b) {
 
   return a.every((value, index) => value === b[index]);
 }
-
-
-module.exports = {
-  checkFixture,
-  checkUniqueness,
-  getErrorString,
-};
diff --git a/tests/fixtures-valid.js b/tests/fixtures-valid.js
index 58d337a6a6..f6bbcbe6bf 100755
--- a/tests/fixtures-valid.js
+++ b/tests/fixtures-valid.js
@@ -1,14 +1,14 @@
 #!/usr/bin/env node
 
-const { readdir } = require(`fs/promises`);
-const path = require(`path`);
-const chalk = require(`chalk`);
-const minimist = require(`minimist`);
+import { readdir } from 'fs/promises';
+import path from 'path';
+import chalk from 'chalk';
+import minimist from 'minimist';
 
-const getAjvValidator = require(`../lib/ajv-validator.js`);
-const getAjvErrorMessages = require(`../lib/get-ajv-error-messages.js`);
-const { checkFixture, checkUniqueness } = require(`./fixture-valid.js`);
-const importJson = require(`../lib/import-json.js`);
+import getAjvValidator from '../lib/ajv-validator.js';
+import getAjvErrorMessages from '../lib/get-ajv-error-messages.js';
+import { checkFixture, checkUniqueness } from './fixture-valid.js';
+import importJson from '../lib/import-json.js';
 
 
 const cliArguments = minimist(process.argv.slice(2), {
@@ -16,10 +16,11 @@ const cliArguments = minimist(process.argv.slice(2), {
   alias: { h: `help`, a: `all-fixtures` },
 });
 
+const scriptName = import.meta.url.split(`/`).pop();
 
 const helpMessage = [
   `Check validity of some/all fixtures`,
-  `Usage: node ${path.relative(process.cwd(), __filename)} -a | -h | fixtures [...]`,
+  `Usage: node ${scriptName} -a | -h | fixtures [...]`,
   `Options:`,
   `  fixtures: a list of fixtures contained in the fixtures/ directory.`,
   `     has to resolve to the form 'manufacturer/fixture'`,
@@ -56,7 +57,7 @@ const uniqueValues = {
   fixShortNames: new Set(),
 };
 
-const fixtureDirectory = path.join(__dirname, `..`, `fixtures/`);
+const fixtureDirectoryUrl = new URL(`../fixtures/`, import.meta.url);
 
 /**
  * @returns {Promise.<Array.<Object>>} A Promise that resolves to an array of result objects.
@@ -65,13 +66,13 @@ async function runTests() {
   const promises = [];
 
   if (cliArguments.a) {
-    const directoryEntries = await readdir(fixtureDirectory, { withFileTypes: true });
+    const directoryEntries = await readdir(fixtureDirectoryUrl, { withFileTypes: true });
     const manufacturerKeys = directoryEntries.filter(entry => entry.isDirectory()).map(entry => entry.name);
 
     for (const manufacturerKey of manufacturerKeys) {
-      const manufacturersDirectory = path.join(fixtureDirectory, manufacturerKey);
+      const manufacturersDirectoryUrl = new URL(manufacturerKey, fixtureDirectoryUrl);
 
-      for (const file of await readdir(manufacturersDirectory)) {
+      for (const file of await readdir(manufacturersDirectoryUrl)) {
         if (path.extname(file) === `.json`) {
           const fixtureKey = path.basename(file, `.json`);
           promises.push(checkFixtureFile(manufacturerKey, fixtureKey));
@@ -117,7 +118,7 @@ async function checkFixtureFile(manufacturerKey, fixtureKey) {
   };
 
   try {
-    const fixtureJson = await importJson(filename, fixtureDirectory);
+    const fixtureJson = await importJson(filename, fixtureDirectoryUrl);
     Object.assign(result, await checkFixture(manufacturerKey, fixtureKey, fixtureJson, uniqueValues));
   }
   catch (error) {
@@ -138,7 +139,7 @@ async function checkManufacturers() {
   };
 
   try {
-    const manufacturers = await importJson(result.name, fixtureDirectory);
+    const manufacturers = await importJson(result.name, fixtureDirectoryUrl);
     const validate = await getAjvValidator(`manufacturers`);
     const valid = validate(manufacturers);
     if (!valid) {
diff --git a/tests/github/export-diff.js b/tests/github/export-diff.js
index 07cc3c4d91..731028b813 100755
--- a/tests/github/export-diff.js
+++ b/tests/github/export-diff.js
@@ -1,12 +1,10 @@
 #!/usr/bin/env node
 
-const path = require(`path`);
+import diffPluginOutputs from '../../lib/diff-plugin-outputs.js';
+import importJson from '../../lib/import-json.js';
+import * as pullRequest from './pull-request.js';
 
-const diffPluginOutputs = require(`../../lib/diff-plugin-outputs.js`);
-const importJson = require(`../../lib/import-json.js`);
-const pullRequest = require(`./pull-request.js`);
-
-require(`../../lib/load-env-file.js`);
+import '../../lib/load-env-file.js';
 
 /**
  * @typedef {Object} Task
@@ -26,7 +24,7 @@ require(`../../lib/load-env-file.js`);
 
     if (tasks.length === 0) {
       await pullRequest.updateComment({
-        filename: path.relative(path.join(__dirname, `../../`), __filename),
+        fileUrl: new URL(import.meta.url),
         name: `Plugin export diff`,
         lines: [],
       });
@@ -55,7 +53,7 @@ require(`../../lib/load-env-file.js`);
     }
 
     await pullRequest.updateComment({
-      filename: path.relative(path.join(__dirname, `../../`), __filename),
+      fileUrl: new URL(import.meta.url),
       name: `Plugin export diff`,
       lines,
     });
@@ -73,11 +71,11 @@ require(`../../lib/load-env-file.js`);
  * @returns {Promise.<Array.<Task>>} A Promise that resolves to an array of diff tasks to perform.
  */
 async function getDiffTasks(changedComponents) {
-  const testFixtures = (await importJson(`../test-fixtures.json`, __dirname)).map(
+  const testFixtures = (await importJson(`../test-fixtures.json`, import.meta.url)).map(
     fixture => `${fixture.man}/${fixture.key}`,
   );
 
-  const plugins = await importJson(`../../plugins/plugins.json`, __dirname);
+  const plugins = await importJson(`../../plugins/plugins.json`, import.meta.url);
   const usablePlugins = plugins.exportPlugins.filter(
     // don't diff new plugins and the ofl plugin (which essentially exports the source files)
     pluginKey => !changedComponents.added.exports.includes(pluginKey) && pluginKey !== `ofl`,
@@ -153,7 +151,7 @@ async function getDiffTasks(changedComponents) {
     const addedPlugins = changedComponents.added.exports;
     const removedPlugins = changedComponents.removed.exports;
     for (const addedPlugin of addedPlugins) {
-      const pluginData = await importJson(`../../plugins/${addedPlugin}/plugin.json`, __dirname);
+      const pluginData = await importJson(`../../plugins/${addedPlugin}/plugin.json`, import.meta.url);
 
       if (pluginData.previousVersions) {
         const previousVersions = Object.keys(pluginData.previousVersions);
diff --git a/tests/github/exports-valid.js b/tests/github/exports-valid.js
index a8f98e6bf2..04f05ebe48 100644
--- a/tests/github/exports-valid.js
+++ b/tests/github/exports-valid.js
@@ -1,10 +1,10 @@
 #!/usr/bin/env node
 
-const path = require(`path`);
+import { fileURLToPath } from 'url';
 
-const { fixtureFromRepository } = require(`../../lib/model.js`);
-const importJson = require(`../../lib/import-json.js`);
-const pullRequest = require(`./pull-request.js`);
+import { fixtureFromRepository } from '../../lib/model.js';
+import importJson from '../../lib/import-json.js';
+import * as pullRequest from './pull-request.js';
 
 let plugins;
 let exportTests;
@@ -26,7 +26,7 @@ let testErrored = false;
     await pullRequest.init();
     const changedComponents = await pullRequest.fetchChangedComponents();
 
-    plugins = await importJson(`../../plugins/plugins.json`, __dirname);
+    plugins = await importJson(`../../plugins/plugins.json`, import.meta.url);
 
     exportTests = [];
     for (const exportPluginKey of plugins.exportPlugins) {
@@ -37,7 +37,7 @@ let testErrored = false;
       ));
     }
 
-    testFixtures = (await importJson(`../test-fixtures.json`, __dirname)).map(
+    testFixtures = (await importJson(`../test-fixtures.json`, import.meta.url)).map(
       fixture => [fixture.man, fixture.key],
     );
 
@@ -79,7 +79,7 @@ let testErrored = false;
 
     if (tasks.length === 0) {
       await pullRequest.updateComment({
-        filename: path.relative(path.join(__dirname, `../../`), __filename),
+        fileUrl: new URL(import.meta.url),
         name: `Export files validity`,
         lines: [],
       });
@@ -109,7 +109,7 @@ let testErrored = false;
     }
 
     await pullRequest.updateComment({
-      filename: path.relative(path.join(__dirname, `../../`), __filename),
+      fileUrl: new URL(import.meta.url),
       name: `Export files validity`,
       lines,
     });
@@ -221,8 +221,9 @@ function getTasksForFixtures(changedComponents) {
  * @returns {Promise} A promise resolving with an array of message lines.
  */
 async function getTaskPromise(task) {
-  const plugin = require(`../../plugins/${task.pluginKey}/export.js`);
-  const test = require(`../../plugins/${task.pluginKey}/exportTests/${task.testKey}.js`);
+  const plugin = await import(`../../plugins/${task.pluginKey}/export.js`);
+  const { default: test } = await import(`../../plugins/${task.pluginKey}/exportTests/${task.testKey}.js`);
+
   let emoji = `:heavy_check_mark:`;
   const detailListItems = [];
 
@@ -230,7 +231,7 @@ async function getTaskPromise(task) {
     const files = await plugin.exportFixtures(
       [await fixtureFromRepository(task.manufacturerKey, task.fixtureKey)],
       {
-        baseDirectory: path.join(__dirname, `../..`),
+        baseDirectory: fileURLToPath(new URL(`../../`, import.meta.url)),
         date: new Date(),
       },
     );
diff --git a/tests/github/pull-request.js b/tests/github/pull-request.js
index 4bf6325f18..1b902a60cb 100644
--- a/tests/github/pull-request.js
+++ b/tests/github/pull-request.js
@@ -1,7 +1,9 @@
-const chalk = require(`chalk`);
-const { Octokit } = require(`@octokit/rest`);
+import path from 'path';
+import chalk from 'chalk';
+import { Octokit } from '@octokit/rest';
+import { fileURLToPath } from 'url';
 
-require(`../../lib/load-env-file.js`);
+import '../../lib/load-env-file.js';
 
 const requiredEnvironmentVariables = [
   `GITHUB_USER_TOKEN`,
@@ -22,16 +24,20 @@ let prData;
  * Checks if the environment variables for GitHub operations are correct.
  * @returns {Promise} Rejects an error message if the environment is not correct.
  */
-module.exports.checkEnv = async function checkEnv() {
+export async function checkEnv() {
   for (const environmentVariable of requiredEnvironmentVariables) {
     if (!(environmentVariable in process.env)) {
       throw `Environment variable ${environmentVariable} is required for this script. Please define it in your system or in the .env file.`;
     }
   }
-};
+}
 
-module.exports.init = async function init() {
-  await module.exports.checkEnv();
+/**
+ * Fetch data about the current pull request from the GitHub API.
+ * @returns {Promise} A Promise that resolves to the returned pull request data.
+ */
+export async function init() {
+  await checkEnv();
 
   repoOwner = process.env.GITHUB_REPOSITORY.split(`/`)[0];
   repoName = process.env.GITHUB_REPOSITORY.split(`/`)[1];
@@ -50,9 +56,12 @@ module.exports.init = async function init() {
   prData = pr.data;
 
   return pr.data;
-};
+}
 
-module.exports.fetchChangedComponents = async function fetchChangedComponents() {
+/**
+ * @returns {Promise} A Promise that resolves to an object which describes the OFL components changed in this pull request.
+ */
+export async function fetchChangedComponents() {
   // fetch changed files in blocks of 100
   const filePromises = [];
   for (let index = 0; index < prData.changed_files / 100; index++) {
@@ -163,27 +172,30 @@ module.exports.fetchChangedComponents = async function fetchChangedComponents()
       ]);
     }
   }
-};
+}
 
 /**
  * Creates a new comment in the PR if test.lines is not empty and if there is not already an exactly equal comment.
- * Deletes old comments from the same test (determined by test.filename).
+ * Deletes old comments from the same test (determined by test.fileUrl).
  * @param {Object} test Information about the test script that wants to update the comment.
- * @param {String} test.filename Relative path from OFL root dir to test file: 'tests/github/test-file-name.js'
+ * @param {URL} test.fileUrl URL of the test file.
  * @param {String} test.name Heading to be used in the comment
  * @param {Array.<String>} test.lines The comment's lines of text
  * @returns {Promise} A Promise that is fulfilled as soon as all GitHub operations have finished
  */
-module.exports.updateComment = async function updateComment(test) {
+export async function updateComment(test) {
   if (prData.head.repo.full_name !== prData.base.repo.full_name) {
     console.warn(chalk.yellow(`Warning:`), `This PR is created from a forked repository, so there is no write permission for the repo.`);
     return undefined;
   }
 
+  const oflRootPath = fileURLToPath(new URL(`../../`, import.meta.url));
+  const relativeFilePath = path.relative(oflRootPath, fileURLToPath(test.fileUrl));
+
   const lines = [
-    `<!-- GITHUB-TEST: ${test.filename} -->`,
+    `<!-- GITHUB-TEST: ${relativeFilePath} -->`,
     `# ${test.name}`,
-    `(Output of test script \`${test.filename}\`.)`,
+    `(Output of test script \`${relativeFilePath}\`.)`,
     ``,
     ...test.lines,
   ];
@@ -240,12 +252,4 @@ module.exports.updateComment = async function updateComment(test) {
   }
 
   return Promise.all(promises);
-};
-
-module.exports.getTestFixturesMessage = function getTestFixturesMessage(fixtures) {
-  return [
-    `Tested with the following minimal collection of [test fixtures](https://github.com/OpenLightingProject/open-fixture-library/blob/master/docs/fixture-features.md) that cover all fixture features:`,
-    ...fixtures.map(fixture => `- ${fixture}`),
-    ``,
-  ];
-};
+}
diff --git a/tests/github/schema-version-reminder.js b/tests/github/schema-version-reminder.js
index 7ad7be75f9..0549a5083e 100644
--- a/tests/github/schema-version-reminder.js
+++ b/tests/github/schema-version-reminder.js
@@ -1,10 +1,8 @@
 #!/usr/bin/env node
 
-const path = require(`path`);
+import * as pullRequest from './pull-request.js';
 
-const pullRequest = require(`./pull-request.js`);
-
-require(`../../lib/load-env-file.js`);
+import '../../lib/load-env-file.js';
 
 (async () => {
   try {
@@ -21,7 +19,7 @@ require(`../../lib/load-env-file.js`);
     }
 
     await pullRequest.updateComment({
-      filename: path.relative(path.join(__dirname, `../../`), __filename),
+      fileUrl: new URL(import.meta.url),
       name: `Schema has changed`,
       lines,
     });
diff --git a/tests/http-status.js b/tests/http-status.js
index 95c7d6089e..5e42779ded 100755
--- a/tests/http-status.js
+++ b/tests/http-status.js
@@ -1,10 +1,10 @@
 #!/usr/bin/env node
 
-const chalk = require(`chalk`);
+import chalk from 'chalk';
 
-require(`../lib/load-env-file.js`);
+import '../lib/load-env-file.js';
 
-const SiteCrawler = require(`../lib/site-crawler.js`);
+import SiteCrawler from '../lib/site-crawler.js';
 
 (async () => {
   const testStartTime = Date.now();
diff --git a/ui/api/download.js b/ui/api/download.js
index 6f98af68f0..431a947c5a 100644
--- a/ui/api/download.js
+++ b/ui/api/download.js
@@ -1,16 +1,16 @@
-const express = require(`express`);
-const JSZip = require(`jszip`);
-
-const { fixtureFromRepository, embedResourcesIntoFixtureJson } = require(`../../lib/model.js`);
-const importJson = require(`../../lib/import-json.js`);
-const Fixture = require(`../../lib/model/Fixture.js`).default;
-const Manufacturer = require(`../../lib/model/Manufacturer.js`).default;
-const { sendJson, sendAttachment } = require(`../../lib/server-response-helpers.js`);
+import express from 'express';
+import JSZip from 'jszip';
+import { fileURLToPath } from 'url';
+
+import { fixtureFromRepository, embedResourcesIntoFixtureJson } from '../../lib/model.js';
+import importJson from '../../lib/import-json.js';
+import Fixture from '../../lib/model/Fixture.js';
+import Manufacturer from '../../lib/model/Manufacturer.js';
+import { sendJson, sendAttachment } from '../../lib/server-response-helpers.js';
 /** @typedef {import('http').ServerResponse} ServerResponse */
 
-const pluginsPromise = importJson(`../../plugins/plugins.json`, __dirname);
-const registerPromise = importJson(`../../fixtures/register.json`, __dirname);
-
+const pluginsPromise = importJson(`../../plugins/plugins.json`, import.meta.url);
+const registerPromise = importJson(`../../fixtures/register.json`, import.meta.url);
 
 /**
  * Instruct Express to initiate a download of one / multiple exported fixture files.
@@ -22,11 +22,11 @@ const registerPromise = importJson(`../../fixtures/register.json`, __dirname);
  * @returns {Promise} A Promise that is resolved when the response is sent.
  */
 async function downloadFixtures(response, pluginKey, fixtures, zipName, errorDesc) {
-  const plugin = require(`../../plugins/${pluginKey}/export.js`);
+  const plugin = await import(`../../plugins/${pluginKey}/export.js`);
 
   try {
     const files = await plugin.exportFixtures(fixtures, {
-      baseDirectory: __dirname,
+      baseDirectory: fileURLToPath(new URL(`../../`, import.meta.url)),
       date: new Date(),
     });
 
@@ -132,7 +132,7 @@ router.get(`/:manufacturerKey/:fixtureKey.:format([a-z0-9_.-]+)`, async (request
 
   if (format === `json`) {
     try {
-      const json = await importJson(`../../fixtures/${manufacturerKey}/${fixtureKey}.json`, __dirname);
+      const json = await importJson(`../../fixtures/${manufacturerKey}/${fixtureKey}.json`, import.meta.url);
       await embedResourcesIntoFixtureJson(json);
       sendJson(response, json);
     }
@@ -157,4 +157,4 @@ router.get(`/:manufacturerKey/:fixtureKey.:format([a-z0-9_.-]+)`, async (request
   downloadFixtures(response, format, fixtures, zipName, errorDesc);
 });
 
-module.exports = router;
+export default router;
diff --git a/ui/api/index.js b/ui/api/index.js
index 7a4b24c823..f662c5a2dd 100644
--- a/ui/api/index.js
+++ b/ui/api/index.js
@@ -1,11 +1,12 @@
-const express = require(`express`);
-const chalk = require(`chalk`);
-const cors = require(`cors`);
-const OpenAPIBackend = require(`openapi-backend`).default;
-const getAjvErrorMessages = require(`../../lib/get-ajv-error-messages.js`);
-const { sendJson } = require(`../../lib/server-response-helpers.js`);
+import express from 'express';
+import chalk from 'chalk';
+import cors from 'cors';
+import { fileURLToPath } from 'url';
+import { OpenAPIBackend } from 'openapi-backend';
+import getAjvErrorMessages from '../../lib/get-ajv-error-messages.js';
+import { sendJson } from '../../lib/server-response-helpers.js';
 
-const routeHandlers = require(`./routes.js`);
+import * as routeHandlers from './routes.js';
 
 /**
  * @typedef {Object} ApiResponse
@@ -42,7 +43,7 @@ app.use(cors({
 const base64Regex = /^(?:[\d+/A-Za-z]{4})*(?:[\d+/A-Za-z]{2}==|[\d+/A-Za-z]{3}=)?$/;
 
 const api = new OpenAPIBackend({
-  definition: `${__dirname}/openapi.json`,
+  definition: fileURLToPath(new URL(`openapi.json`, import.meta.url)),
   strict: process.env.NODE_ENV !== `production`,
   ajvOpts: {
     formats: {
@@ -122,4 +123,4 @@ app.use(async (request, response) => {
   sendJson(response, body);
 });
 
-module.exports = app;
+export default app;
diff --git a/ui/api/routes.js b/ui/api/routes.js
index 8fa3add09d..6472785858 100644
--- a/ui/api/routes.js
+++ b/ui/api/routes.js
@@ -1,11 +1,9 @@
-module.exports = {
-  ...require(`./routes/get-search-results.js`),
-  ...require(`./routes/submit-feedback.js`),
-  ...require(`./routes/fixtures/from-editor.js`),
-  ...require(`./routes/fixtures/import.js`),
-  ...require(`./routes/fixtures/submit.js`),
-  ...require(`./routes/manufacturers/index.js`),
-  ...require(`./routes/manufacturers/_manufacturerKey.js`),
-  ...require(`./routes/plugins/index.js`),
-  ...require(`./routes/plugins/_pluginKey.js`),
-};
+export { getSearchResults } from './routes/get-search-results.js';
+export { createFeedbackIssue } from './routes/submit-feedback.js';
+export { createFixtureFromEditor } from './routes/fixtures/from-editor.js';
+export { importFixtureFile } from './routes/fixtures/import.js';
+export { submitFixtures } from './routes/fixtures/submit.js';
+export { getManufacturers } from './routes/manufacturers/index.js';
+export { getManufacturerByKey } from './routes/manufacturers/_manufacturerKey.js';
+export { getPlugins } from './routes/plugins/index.js';
+export { getPluginByKey } from './routes/plugins/_pluginKey.js';
diff --git a/ui/api/routes/fixtures/from-editor.js b/ui/api/routes/fixtures/from-editor.js
index 041b6771a1..3c4cf235cd 100644
--- a/ui/api/routes/fixtures/from-editor.js
+++ b/ui/api/routes/fixtures/from-editor.js
@@ -1,7 +1,7 @@
-const schemaProperties = require(`../../../../lib/schema-properties.js`).default;
-const { checkFixture } = require(`../../../../tests/fixture-valid.js`);
-const { CoarseChannel } = require(`../../../../lib/model.js`);
-const importJson = require(`../../../../lib/import-json.js`);
+import schemaProperties from '../../../../lib/schema-properties.js';
+import { checkFixture } from '../../../../tests/fixture-valid.js';
+import { CoarseChannel } from '../../../../lib/model.js';
+import importJson from '../../../../lib/import-json.js';
 
 /** @typedef {import('openapi-backend').Context} OpenApiBackendContext */
 /** @typedef {import('../../index.js').ApiResponse} ApiResponse */
@@ -12,7 +12,7 @@ const importJson = require(`../../../../lib/import-json.js`);
  * @param {OpenApiBackendContext} ctx Passed from OpenAPI Backend.
  * @returns {Promise.<ApiResponse>} The handled response.
  */
-async function createFixtureFromEditor({ request }) {
+export async function createFixtureFromEditor({ request }) {
   try {
     const fixtureCreateResult = await getFixtureCreateResult(request.requestBody);
     return {
@@ -43,7 +43,7 @@ async function getFixtureCreateResult(fixtures) {
     errors: {},
   };
 
-  const manufacturers = await importJson(`../../../../fixtures/manufacturers.json`, __dirname);
+  const manufacturers = await importJson(`../../../../fixtures/manufacturers.json`, import.meta.url);
 
   // { 'uuid 1': 'new channel key 1', ... }
   const channelKeyMapping = {};
@@ -433,5 +433,3 @@ function getComboboxInput(property, from) {
 function slugify(string) {
   return string.toLowerCase().replace(/[^\da-z-]+/g, ` `).trim().replace(/\s+/g, `-`);
 }
-
-module.exports = { createFixtureFromEditor };
diff --git a/ui/api/routes/fixtures/import.js b/ui/api/routes/fixtures/import.js
index 22dd4e90cf..92b8eed3d6 100644
--- a/ui/api/routes/fixtures/import.js
+++ b/ui/api/routes/fixtures/import.js
@@ -1,5 +1,5 @@
-const importJson = require(`../../../../lib/import-json.js`);
-const { checkFixture } = require(`../../../../tests/fixture-valid.js`);
+import importJson from '../../../../lib/import-json.js';
+import { checkFixture } from '../../../../tests/fixture-valid.js';
 
 /** @typedef {import('openapi-backend').Context} OpenApiBackendContext */
 /** @typedef {import('../../index.js').ApiResponse} ApiResponse */
@@ -18,7 +18,7 @@ const { checkFixture } = require(`../../../../tests/fixture-valid.js`);
  * @param {OpenApiBackendContext} ctx Passed from OpenAPI Backend.
  * @returns {ApiResponse} The handled response.
  */
-async function importFixtureFile({ request }) {
+export async function importFixtureFile({ request }) {
   try {
     const fixtureCreateResult = await importFixture(request.requestBody);
     return {
@@ -42,13 +42,13 @@ async function importFixtureFile({ request }) {
  * @returns {FixtureCreateResult} The imported fixtures (and manufacturers) with warnings and errors.
  */
 async function importFixture(body) {
-  const { importPlugins } = await importJson(`../../../../plugins/plugins.json`, __dirname);
+  const { importPlugins } = await importJson(`../../../../plugins/plugins.json`, import.meta.url);
 
   if (!body.plugin || !importPlugins.includes(body.plugin)) {
     throw new Error(`'${body.plugin}' is not a valid import plugin.`);
   }
 
-  const plugin = require(`../../../../plugins/${body.plugin}/import.js`);
+  const plugin = await import(`../../../../plugins/${body.plugin}/import.js`);
   const { manufacturers, fixtures, warnings } = await plugin.importFixtures(
     Buffer.from(body.fileContentBase64, `base64`),
     body.fileName,
@@ -66,7 +66,7 @@ async function importFixture(body) {
     errors: {},
   };
 
-  const oflManufacturers = await importJson(`../../../../fixtures/manufacturers.json`, __dirname);
+  const oflManufacturers = await importJson(`../../../../fixtures/manufacturers.json`, import.meta.url);
 
   for (const [key, fixture] of Object.entries(result.fixtures)) {
     const [manufacturerKey, fixtureKey] = key.split(`/`);
@@ -83,5 +83,3 @@ async function importFixture(body) {
 
   return result;
 }
-
-module.exports = { importFixtureFile };
diff --git a/ui/api/routes/fixtures/submit.js b/ui/api/routes/fixtures/submit.js
index 4adea1ef55..17153215eb 100644
--- a/ui/api/routes/fixtures/submit.js
+++ b/ui/api/routes/fixtures/submit.js
@@ -1,4 +1,4 @@
-const createPullRequest = require(`../../../../lib/create-github-pr.js`);
+import createPullRequest from '../../../../lib/create-github-pr.js';
 
 /** @typedef {import('openapi-backend').Context} OpenApiBackendContext */
 /** @typedef {import('../../index.js').ApiResponse} ApiResponse */
@@ -17,7 +17,7 @@ const createPullRequest = require(`../../../../lib/create-github-pr.js`);
  * @param {OpenApiBackendContext} ctx Passed from OpenAPI Backend.
  * @returns {ApiResponse} The handled response.
  */
-async function submitFixtures({ request }) {
+export async function submitFixtures({ request }) {
   try {
     const pullRequestUrl = await createPullRequest(
       request.requestBody.fixtureCreateResult,
@@ -40,5 +40,3 @@ async function submitFixtures({ request }) {
     };
   }
 }
-
-module.exports = { submitFixtures };
diff --git a/ui/api/routes/get-search-results.js b/ui/api/routes/get-search-results.js
index 3f025ebe3d..5fc0d7969a 100644
--- a/ui/api/routes/get-search-results.js
+++ b/ui/api/routes/get-search-results.js
@@ -1,4 +1,4 @@
-const importJson = require(`../../../lib/import-json.js`);
+import importJson from '../../../lib/import-json.js';
 
 let register;
 let manufacturers;
@@ -11,11 +11,11 @@ let manufacturers;
  * @param {OpenApiBackendContext} ctx Passed from OpenAPI Backend.
  * @returns {Promise.<ApiResponse>} The handled response.
  */
-async function getSearchResults({ request }) {
+export async function getSearchResults({ request }) {
   const { searchQuery, manufacturersQuery, categoriesQuery } = request.requestBody;
 
-  register = await importJson(`../../../fixtures/register.json`, __dirname);
-  manufacturers = await importJson(`../../../fixtures/manufacturers.json`, __dirname);
+  register = await importJson(`../../../fixtures/register.json`, import.meta.url);
+  manufacturers = await importJson(`../../../fixtures/manufacturers.json`, import.meta.url);
 
   const results = Object.keys(register.filesystem).filter(
     key => queryMatch(searchQuery, key) && manufacturerMatch(manufacturersQuery, key) && categoryMatch(categoriesQuery, key),
@@ -65,5 +65,3 @@ function categoryMatch(categoriesQuery, fixtureKey) {
       cat => cat in register.categories && register.categories[cat].includes(fixtureKey),
     );
 }
-
-module.exports = { getSearchResults };
diff --git a/ui/api/routes/manufacturers/_manufacturerKey.js b/ui/api/routes/manufacturers/_manufacturerKey.js
index da5bad3eb4..69e2406758 100644
--- a/ui/api/routes/manufacturers/_manufacturerKey.js
+++ b/ui/api/routes/manufacturers/_manufacturerKey.js
@@ -1,4 +1,4 @@
-const importJson = require(`../../../../lib/import-json.js`);
+import importJson from '../../../../lib/import-json.js';
 
 /** @typedef {import('openapi-backend').Context} OpenApiBackendContext */
 /** @typedef {import('../../index.js').ApiResponse} ApiResponse */
@@ -8,10 +8,10 @@ const importJson = require(`../../../../lib/import-json.js`);
  * @param {OpenApiBackendContext} ctx Passed from OpenAPI Backend.
  * @returns {Promise.<ApiResponse>} The handled response.
  */
-async function getManufacturerByKey({ request }) {
+export async function getManufacturerByKey({ request }) {
   const { manufacturerKey } = request.params;
 
-  const manufacturers = await importJson(`../../../../fixtures/manufacturers.json`, __dirname);
+  const manufacturers = await importJson(`../../../../fixtures/manufacturers.json`, import.meta.url);
   if (!(manufacturerKey in manufacturers) || manufacturerKey === `$schema`) {
     return {
       statusCode: 404,
@@ -21,7 +21,7 @@ async function getManufacturerByKey({ request }) {
     };
   }
 
-  const register = await importJson(`../../../../fixtures/register.json`, __dirname);
+  const register = await importJson(`../../../../fixtures/register.json`, import.meta.url);
   const manufacturer = Object.assign({}, manufacturers[manufacturerKey], {
     key: manufacturerKey,
     color: register.colors[manufacturerKey],
@@ -40,6 +40,3 @@ async function getManufacturerByKey({ request }) {
     body: manufacturer,
   };
 }
-
-
-module.exports = { getManufacturerByKey };
diff --git a/ui/api/routes/manufacturers/index.js b/ui/api/routes/manufacturers/index.js
index f099b3c22b..2faf6da56a 100644
--- a/ui/api/routes/manufacturers/index.js
+++ b/ui/api/routes/manufacturers/index.js
@@ -1,4 +1,4 @@
-const importJson = require(`../../../../lib/import-json.js`);
+import importJson from '../../../../lib/import-json.js';
 
 /** @typedef {import('openapi-backend').Context} OpenApiBackendContext */
 /** @typedef {import('../../index.js').ApiResponse} ApiResponse */
@@ -8,9 +8,9 @@ const importJson = require(`../../../../lib/import-json.js`);
  * @param {OpenApiBackendContext} context Passed from OpenAPI Backend.
  * @returns {Promise.<ApiResponse>} The handled response.
  */
-async function getManufacturers(context) {
-  const manufacturers = await importJson(`../../../../fixtures/manufacturers.json`, __dirname);
-  const register = await importJson(`../../../../fixtures/register.json`, __dirname);
+export async function getManufacturers(context) {
+  const manufacturers = await importJson(`../../../../fixtures/manufacturers.json`, import.meta.url);
+  const register = await importJson(`../../../../fixtures/register.json`, import.meta.url);
 
   const manufacturerData = {};
 
@@ -28,6 +28,3 @@ async function getManufacturers(context) {
     body: manufacturerData,
   };
 }
-
-
-module.exports = { getManufacturers };
diff --git a/ui/api/routes/plugins/_pluginKey.js b/ui/api/routes/plugins/_pluginKey.js
index 9996c5863d..9e80bf463d 100644
--- a/ui/api/routes/plugins/_pluginKey.js
+++ b/ui/api/routes/plugins/_pluginKey.js
@@ -1,4 +1,4 @@
-const importJson = require(`../../../../lib/import-json.js`);
+import importJson from '../../../../lib/import-json.js';
 
 /** @typedef {import('openapi-backend').Context} OpenApiBackendContext */
 /** @typedef {import('../../index.js').ApiResponse} ApiResponse */
@@ -8,10 +8,10 @@ const importJson = require(`../../../../lib/import-json.js`);
  * @param {OpenApiBackendContext} ctx Passed from OpenAPI Backend.
  * @returns {Promise.<ApiResponse>} The handled response.
  */
-async function getPluginByKey({ request }) {
+export async function getPluginByKey({ request }) {
   let { pluginKey } = request.params;
 
-  const plugins = await importJson(`../../../../plugins/plugins.json`, __dirname);
+  const plugins = await importJson(`../../../../plugins/plugins.json`, import.meta.url);
 
   if (!(pluginKey in plugins.data)) {
     return {
@@ -26,7 +26,7 @@ async function getPluginByKey({ request }) {
     pluginKey = plugins.data[pluginKey].newPlugin;
   }
 
-  const pluginData = await importJson(`../../../../plugins/${pluginKey}/plugin.json`, __dirname);
+  const pluginData = await importJson(`../../../../plugins/${pluginKey}/plugin.json`, import.meta.url);
 
   return {
     body: {
@@ -44,6 +44,3 @@ async function getPluginByKey({ request }) {
     },
   };
 }
-
-
-module.exports = { getPluginByKey };
diff --git a/ui/api/routes/plugins/index.js b/ui/api/routes/plugins/index.js
index 86465fef7e..f0e725f109 100644
--- a/ui/api/routes/plugins/index.js
+++ b/ui/api/routes/plugins/index.js
@@ -1,4 +1,4 @@
-const importJson = require(`../../../../lib/import-json.js`);
+import importJson from '../../../../lib/import-json.js';
 
 /** @typedef {import('openapi-backend').Context} OpenApiBackendContext */
 /** @typedef {import('../../index.js').ApiResponse} ApiResponse */
@@ -8,13 +8,10 @@ const importJson = require(`../../../../lib/import-json.js`);
  * @param {OpenApiBackendContext} context Passed from OpenAPI Backend.
  * @returns {Promise.<ApiResponse>} The handled response.
  */
-async function getPlugins(context) {
-  const plugins = await importJson(`../../../../plugins/plugins.json`, __dirname);
+export async function getPlugins(context) {
+  const plugins = await importJson(`../../../../plugins/plugins.json`, import.meta.url);
 
   return {
     body: plugins,
   };
 }
-
-
-module.exports = { getPlugins };
diff --git a/ui/api/routes/submit-feedback.js b/ui/api/routes/submit-feedback.js
index dc6c604001..4682cd9e9f 100644
--- a/ui/api/routes/submit-feedback.js
+++ b/ui/api/routes/submit-feedback.js
@@ -1,5 +1,5 @@
-const createIssue = require(`../../../lib/create-github-issue.js`);
-const { fixtureFromRepository } = require(`../../../lib/model.js`);
+import createIssue from '../../../lib/create-github-issue.js';
+import { fixtureFromRepository } from '../../../lib/model.js';
 
 /** @typedef {import('openapi-backend').Context} OpenApiBackendContext */
 /** @typedef {import('../index.js').ApiResponse} ApiResponse */
@@ -9,7 +9,7 @@ const { fixtureFromRepository } = require(`../../../lib/model.js`);
  * @param {OpenApiBackendContext} ctx Passed from OpenAPI Backend.
  * @returns {ApiResponse} The handled response.
  */
-async function createFeedbackIssue({ request }) {
+export async function createFeedbackIssue({ request }) {
   const {
     type,
     context,
@@ -71,5 +71,3 @@ async function createFeedbackIssue({ request }) {
     },
   };
 }
-
-module.exports = { createFeedbackIssue };
diff --git a/ui/assets/icons/icons.js b/ui/assets/icons/icons.js
index 680ab1e5e4..b8b33ea1ae 100644
--- a/ui/assets/icons/icons.js
+++ b/ui/assets/icons/icons.js
@@ -1,5 +1,6 @@
 // read all SVG files in this directory (and subdirectories) into icons object
 // see https://webpack.js.org/guides/dependency-management/#requirecontext
+// eslint-disable-next-line unicorn/prefer-module
 const resolve = require.context(`.`, true, /\.svg$/);
 
 const getIconPath = key => key.match(/^\.\/(.+)\.svg$/)[1];
diff --git a/ui/components/A11yDialog.vue b/ui/components/A11yDialog.vue
index fc22d88644..90858fdc35 100644
--- a/ui/components/A11yDialog.vue
+++ b/ui/components/A11yDialog.vue
@@ -151,8 +151,8 @@ export default {
   watch: {
     shown: `update`,
   },
-  mounted() {
-    const A11yDialog = require(`a11y-dialog`).default;
+  async mounted() {
+    const { default: A11yDialog } = await import(`a11y-dialog`);
 
     this.dialog = new A11yDialog(this.$el);
 
diff --git a/ui/components/editor/EditorSubmitDialog.vue b/ui/components/editor/EditorSubmitDialog.vue
index 5b88eb5943..f8229fc3e6 100644
--- a/ui/components/editor/EditorSubmitDialog.vue
+++ b/ui/components/editor/EditorSubmitDialog.vue
@@ -193,8 +193,8 @@
 <script>
 import { clone } from '../../assets/scripts/editor-utils.js';
 
-import Manufacturer from '../../../lib/model/Manufacturer';
-import Fixture from '../../../lib/model/Fixture';
+import Manufacturer from '../../../lib/model/Manufacturer.js';
+import Fixture from '../../../lib/model/Fixture.js';
 
 import A11yDialog from '../A11yDialog.vue';
 import DownloadButton from '../DownloadButton.vue';
diff --git a/ui/plugins/polyfills.js b/ui/plugins/polyfills.js
index b77a5ee102..eb8e142483 100644
--- a/ui/plugins/polyfills.js
+++ b/ui/plugins/polyfills.js
@@ -1,7 +1,7 @@
 /* eslint-disable unicorn/no-abusive-eslint-disable */
 /* eslint-disable */
 
-require('details-polyfill');
+import 'details-polyfill';
 
 // https://tc39.github.io/ecma262/#sec-array.prototype.findIndex
 if (!Array.prototype.findIndex) {