next.js

ef6ac79d - feat: detect @typescript/native-preview as alternative TypeScript compiler (#89149)

feat: detect @typescript/native-preview as alternative TypeScript compiler (#89149) ## What? This PR adds support for detecting `@typescript/native-preview` as an alternative TypeScript compiler. When installed, Next.js will no longer automatically install the `typescript` package. ## Why? Fixes #88580 Users who want to use `@typescript/native-preview` (a Go-based native TypeScript compiler) should not be forced to also install the JavaScript-based `typescript` package. This is especially relevant for projects using `next.config.ts` where TypeScript support is provided by Node.js native TS or SWC. ## How? 1. Added `hasNativeTypeScriptPreview()` function to detect if `@typescript/native-preview` is installed 2. Modified the dependency check logic in `verifyTypeScriptSetup()` to skip auto-installing `typescript` when the native preview is present 3. Added an informative log message to notify users that some TypeScript features (like type checking during build) require the standard `typescript` package 4. Added e2e test to verify the behavior ## Test Plan - Added new e2e test at `test/e2e/app-dir/typescript-native-preview/` - The test verifies: - Detection message is shown - `typescript` is not auto-installed - The app still works (SWC/Turbopack handles compilation)