A fast CLI tool to convert JavaScript and JSX files to TypeScript files using Bun.
.js and .jsx files after converting them to .ts and .tsx files respectively.
bun installbun index.ts /path/to/your/projectbun index.ts /path/to/your/project dist build tempbun index.ts /path/to/your/project [ignore-pattern1] [ignore-pattern2] ...bun run build
./js2ts /path/to/your/project [ignore-patterns...]bun link
js2ts /path/to/your/project [ignore-patterns...]- 🚀 Fast file discovery using
Bun.glob() - 📁 Recursive directory traversal
- ⚡ Parallel file processing
- 💻 CLI executable
- 🚫 Ignore patterns support (node_modules, dist, build, out ignored by default)
- 🔄 Converts and removes: Creates
.ts/.tsxfiles and removes original.js/.jsxfiles - 🎯 Supports both:
.js→.tsand.jsx→.tsxconversions - 🧠 Smart JSX detection: Automatically detects JSX syntax in
.jsfiles and converts to.tsx - 📝 Simple: copies content then deletes originals
.jsfiles →.tsfiles (or.tsxif JSX syntax is detected).jsxfiles →.tsxfiles
The tool automatically detects JSX syntax in JavaScript files by looking for:
- JSX components (
<Component>) - HTML elements (
<div>,<span>, etc.) - JSX fragments (
<>,</>) - Self-closing tags (
<Component />)
If JSX syntax is found in a .js file, it will be converted to .tsx instead of .ts.
By default, node_modules, dist, build, and out are always ignored. You can specify additional directories or files to ignore:
js2ts ./src temp coverage __tests__This would ignore:
node_modules/(default)dist/(default)build/(default)out/(default)temp/coverage/__tests__/
$ js2ts ./my-project
🚫 Ignoring patterns: node_modules, dist, build, out
🔍 Found 8 file(s) to convert (5 .js, 3 .jsx)
⚠️ Original .js/.jsx files will be removed after conversion
✅ Converted: ./my-project/index.js -> ./my-project/index.ts
✅ Converted: ./my-project/utils.js -> ./my-project/utils.ts
✅ Converted: ./my-project/components/Button.jsx -> ./my-project/components/Button.tsx
✅ Converted: ./my-project/components/Header.jsx -> ./my-project/components/Header.tsx
✅ Converted: ./my-project/components/App.js -> ./my-project/components/App.tsx
✅ Converted: ./my-project/lib/helper.js -> ./my-project/lib/helper.ts
🎉 Conversion complete - all .js/.jsx files converted to .ts/.tsx and originals removed.$ js2ts ./my-project temp coverage
🚫 Ignoring patterns: node_modules, dist, build, out, temp, coverage
🔍 Found 6 file(s) to convert (4 .js, 2 .jsx)
⚠️ Original .js/.jsx files will be removed after conversion
✅ Converted: ./my-project/src/index.js -> ./my-project/src/index.ts
✅ Converted: ./my-project/src/utils.js -> ./my-project/src/utils.ts
✅ Converted: ./my-project/src/App.jsx -> ./my-project/src/App.tsx
✅ Converted: ./my-project/lib/helper.js -> ./my-project/lib/helper.ts
🎉 Conversion complete - all .js/.jsx files converted to .ts/.tsx and originals removed.This tool permanently removes your original .js and .jsx files after conversion. Make sure to:
- Backup your code or use version control before running
- Test in a safe environment first
- Review the file list shown before proceeding
The tool only removes .js/.jsx files after successfully creating the corresponding .ts/.tsx files.
This project was created using bun init in bun v1.2.15. Bun is a fast all-in-one JavaScript runtime.