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What's new in the RC since the beta? A couple of things, but worth calling out are - A rebuilt `--watch` mode - Stability improvements across the board - New ported editor features - Strategies for using less memory in editors

The rebuilt `--watch` mode is powered by a Go port of Parcel's watcher, giving TypeScript 7 efficient, stable cross-platform file watching. Expect much less CPU usage on idle.

Editor support has come a long way since we first debuted: auto-imports, expandable hovers, inlay hints, code lenses, JSX linked editing, semantic highlighting, sort imports, remove unused imports, and more are now available.

18/6/26, 3:28 pm0 reposts12 likes

Not yet mentioned in the blog post: TypeScript 7.0 will release unused type-checkers in the editor after enough idle time. For bigger projects, this should help reduce memory usage after peaking.

Speaking of which: TypeScript 7 also brings more parallelism to builds. ℹ️ Some tips ℹ️ `--checkers` controls the number of type-checking workers, while `--builders` controls parallel project-reference builds. Use more on powerful machines, or scale down to fewer to control memory usage.

For teams moving gradually, `tsc` from TypeScript 7 can run side-by-side with the `tsc6` executable & API from TypeScript 6 using the new `@typescript/typescript6` package.