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TypeScript 7.1 Beta introduces modular APIs and ES2026 support

Published: October 20, 2026

Microsoft released TypeScript 7.1 Beta with new native compiler APIs and JavaScript language support. Try the preview with:

Terminal window
npm install -D typescript@beta

What changed

  • --target es2026 and --lib es2026 are now supported as stable options, with updated standard-library declarations.
  • New API entry points include typescript/sync, typescript/async, typescript/fs, and typescript/ast. API and Program objects must be disposed, for example with using.
  • Source-phase imports (import source and import.source()) support module-source objects, including WebAssembly use cases, with appropriate --module and esnext settings.
  • Content mappers can expose embedded TypeScript in files such as .vue and .svelte. Command-line execution requires --runExternalCode.
  • Microsoft reports faster builds and lower memory use than TypeScript 7.0 in its published benchmarks.

Availability

This is a beta, not a stable release. Check framework and tooling compatibility before upgrading. The import-attribute support in ambient modules was covered in a separate news article.

Source

Read the official announcement: Announcing TypeScript 7.1 Beta.