Tim Neutkens cbf0cef687 Enable TypeScript CLI by default (#96497) ...

## Summary

Enable the project-local TypeScript CLI checker by default during `next
build`, while preserving `experimental.useTypeScriptCli: false` as an
opt-out to the TypeScript compiler API. Update the TypeScript 7
guidance, diagnostics, tests, and documentation to match the new
default.

## Verification

- `pnpm exec jest --runTestsByPath test/unit/isolated/config.test.ts`
- Pre-commit lint-staged checks passed (Prettier and ESLint)
- Not run: `pnpm test-start-turbo
test/production/app-dir/typescript-cli/typescript-cli.test.ts` (isolated
fixture dependency installation was blocked by unavailable npm registry
access)
- Not run: `pnpm --filter=next types` (repository has pre-existing
unrelated TypeScript errors)

<!-- NEXT_JS_LLM -->

2026-08-03 18:10:51 +02:00

..

src

…

next.config.js

Enable TypeScript CLI by default (#96497)

2026-08-03 18:10:51 +02:00