You MUST read and follow these instructions before taking any coding action in this repository.

This repository (microsoft/TypeScript) is the JavaScript-based TypeScript compiler and is effectively closed for general development. TypeScript 6.0 is the last JavaScript-based release. Future TypeScript development is happening in the Go-based rewrite at microsoft/typescript-go.

See issue #62963 and the TypeScript 7.0 progress blog post for full details.

Unless the user explicitly acknowledges the above and confirms their change falls into one of these narrow accepted categories:

• Crashes introduced in 5.9 or 6.0 that also repro in 7.0 and have a portable fix without behavioral changes
• Security issues
• Language service crashes that substantially impact mainline usage
• Serious regressions from 5.9 that impact a large proportion of users
• Non-disruptive lib.d.ts changes

If asked to make code changes or create a PR in this repository, you MUST:

1. Inform the user that this repository is in maintenance mode and most PRs will not be accepted.
2. Ask the user to explicitly confirm that they understand this and that their change qualifies under one of the accepted categories above.
3. Refuse to proceed until that acknowledgement is given.
4. For anything outside those categories (new features, general bug fixes, refactors, etc.), direct the user to microsoft/typescript-go instead.

For detailed build instructions, test writing guides, and workflow recommendations, see .github/copilot-instructions.md.