diff --git a/commitlint.config.mjs b/commitlint.config.js
similarity index 100%
rename from commitlint.config.mjs
rename to commitlint.config.js
diff --git a/eslint.config.mjs b/eslint.config.js
similarity index 100%
rename from eslint.config.mjs
rename to eslint.config.js
diff --git a/package.json b/package.json
index 6df2c637b19..d140369babe 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
   },
   "license": "GPL-3.0-or-later",
   "author": "Jeroen de Bruijn",
+  "type": "module",
   "main": "src/index.ts",
   "scripts": {
     "build": "run-s clean compile",
diff --git a/src/input.ts b/src/input.ts
index 41c1d00d0f4..5d23443f2a9 100644
--- a/src/input.ts
+++ b/src/input.ts
@@ -1,5 +1,5 @@
 import { getInput } from '@actions/core';
-import path from 'path';
+import path from 'node:path';
 
 export interface EnvironmentVariable {
   key: string;
diff --git a/src/renovate.ts b/src/renovate.ts
index 345504d1cd7..39ba75c59ef 100644
--- a/src/renovate.ts
+++ b/src/renovate.ts
@@ -1,8 +1,8 @@
 import { Docker } from './docker';
 import { Input } from './input';
 import { exec } from '@actions/exec';
-import fs from 'fs/promises';
-import path from 'path';
+import fs from 'node:fs/promises';
+import path from 'node:path';
 
 export class Renovate {
   static dockerGroupRegex = /^docker:x:(?<groupId>[1-9][0-9]*):/m;
diff --git a/tools/cjs-shim.ts b/tools/cjs-shim.ts
new file mode 100644
index 00000000000..48bcca48061
--- /dev/null
+++ b/tools/cjs-shim.ts
@@ -0,0 +1,8 @@
+// https://github.com/evanw/esbuild/issues/1921#issuecomment-1898197331
+import { createRequire } from 'node:module';
+import path from 'node:path';
+import url from 'node:url';
+
+globalThis.require = createRequire(import.meta.url);
+globalThis.__filename = url.fileURLToPath(import.meta.url);
+globalThis.__dirname = path.dirname(__filename);
diff --git a/tools/compile.js b/tools/compile.js
index 8668d15a461..a7e32f84e42 100644
--- a/tools/compile.js
+++ b/tools/compile.js
@@ -9,6 +9,7 @@ await build({
   minify: !!env['CI'],
   tsconfig: 'tsconfig.dist.json',
   sourcemap: true,
-  // format: 'esm', // TODO: later PR
+  format: 'esm',
   outdir: './dist/',
+  inject: ['tools/cjs-shim.ts'], // https://github.com/evanw/esbuild/issues/1921#issuecomment-1898197331
 });
diff --git a/tools/package.json b/tools/package.json
deleted file mode 100644
index 3dbc1ca591c..00000000000
--- a/tools/package.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "type": "module"
-}