typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Pick<T, Exclude<keyof T, K>> & Pick<T, Extract<keyof T, K>> should be assignable to T
- Array.length type guard for array spreading
- Allow ignoring certain TS suggestion-level diagnostic codes
- USVString type definition
- Inconsistency of mapped type and `Parameters<T>` between TS and JS
- Add a --strictNaNChecks option, and a NaN / integer / float type to avoid runtime NaN errors
- Compiler warning for always true/false strict inequality expression
- Autocomplete on extends keyof generic
- Object.defineProperty doesn't define properties on 'this'
- In JS, don't complain about a better inferred type if there's no code action
- Docs
- TypeScript not yet supported