enable tests by adding babel ts tranform plugin

remove flow plugin

.babelrc-deno.json

@@ -1,7 +1,7 @@
 {
   "plugins": [
-    "@babel/plugin-transform-flow-strip-types",
-    ["./resources/add-extension-to-import-paths", { "extension": "js" }],
+    "@babel/plugin-transform-typescript",
+    ["./resources/add-extension-to-import-paths", { "extension": "ts" }],
     "./resources/inline-invariant"
   ]
 }

.babelrc-npm.json

@@ -1,6 +1,6 @@
 {
   "plugins": [
-    "@babel/plugin-transform-flow-strip-types",
+    "@babel/plugin-transform-typescript",
     "./resources/inline-invariant"
   ],
   "env": {

.babelrc.json

@@ -1,9 +1,4 @@
 {
-  "plugins": ["@babel/plugin-transform-flow-strip-types"],
-  "presets": [
-    [
-      "@babel/preset-env",
-      { "bugfixes": true, "targets": { "node": "current" } }
-    ]
-  ]
+  "plugins": ["@babel/plugin-transform-typescript"],
+  "presets": [["@babel/preset-env", { "targets": { "node": "current" } }]]
 }

.mocharc.yml

@@ -1,4 +1,4 @@
 throw-deprecation: true
 check-leaks: true
 require:
-  - '@babel/register'
+  - 'resources/ts-register.js'

package.json

@@ -26,13 +26,13 @@
   "scripts": {
     "preversion": ". ./resources/checkgit.sh && npm ci",
     "version": "node resources/gen-version.js && npm test && git add src/version.js",
-    "fuzzonly": "mocha --full-trace src/**/__tests__/**/*-fuzz.js",
+    "fuzzonly": "mocha --full-trace src/**/__tests__/**/*-fuzz.ts",
     "changelog": "node resources/gen-changelog.js",
     "benchmark": "node benchmark/benchmark.js",
     "test": "npm run lint && npm run check && npm run testonly && npm run prettier:check && npm run check:spelling && npm run check:integrations",
     "lint": "eslint --cache .",
     "check": "flow check",
-    "testonly": "mocha --full-trace src/**/__tests__/**/*-test.js",
+    "testonly": "mocha --full-trace src/**/__tests__/**/*-test.ts",
     "testonly:cover": "nyc npm run testonly",
     "prettier": "prettier --write --list-different .",
     "prettier:check": "prettier --check .",
@@ -46,7 +46,7 @@
   "devDependencies": {
     "@babel/core": "7.14.0",
     "@babel/eslint-parser": "7.13.14",
-    "@babel/plugin-transform-flow-strip-types": "7.13.0",
+    "@babel/plugin-transform-typescript": "7.13.0",
     "@babel/preset-env": "7.14.1",
     "@babel/register": "7.13.16",
     "@typescript-eslint/eslint-plugin": "4.22.1",

resources/build-deno.js

@@ -22,7 +22,7 @@ if (require.main === module) {
     const destPath = path.join('./denoDist', filepath);
 
     fs.mkdirSync(path.dirname(destPath), { recursive: true });
-    if (filepath.endsWith('.js')) {
+    if (filepath.endsWith('.ts') && !filepath.endsWith('.d.ts')) {
       const options = { babelrc: false, configFile: './.babelrc-deno.json' };
       const output = babel.transformFileSync(srcPath, options).code + '\n';
       writeGeneratedFile(destPath, output);

resources/build-npm.js

@@ -23,16 +23,12 @@ if (require.main === module) {
     const destPath = path.join('./npmDist', filepath);
 
     fs.mkdirSync(path.dirname(destPath), { recursive: true });
-    if (filepath.endsWith('.js')) {
-      const flowBody =
-        '// @flow strict\n\n' + fs.readFileSync(srcPath, 'utf-8');
-      fs.writeFileSync(destPath + '.flow', flowBody);
-
+    if (filepath.endsWith('.ts') && !filepath.endsWith('.d.ts')) {
       const cjs = babelBuild(srcPath, { envName: 'cjs' });
-      writeGeneratedFile(destPath, cjs);
+      writeGeneratedFile(destPath.replace(/\.ts$/, '.js'), cjs);
 
       const mjs = babelBuild(srcPath, { envName: 'mjs' });
-      writeGeneratedFile(destPath.replace(/\.js$/, '.mjs'), mjs);
+      writeGeneratedFile(destPath.replace(/\.ts$/, '.mjs'), mjs);
     } else if (filepath.endsWith('.d.ts')) {
       fs.copyFileSync(srcPath, destPath);
     }

resources/ts-register.js

@@ -0,0 +1,3 @@
+'use strict';
+
+require('@babel/register')({ extensions: ['.ts'] });