Changelog

microsoft/typescript-go · · 1 commit

Better typing for `this.xxx` assignment declarations

TypeScript-Go now handles self-referential `this` property assignments more precisely, improving inferred property types and avoiding bad widening.

ahejlsberg

Improve this.xxx assignment declaration typing (ahejlsberg2f6504c)

Type inference for assignment declarations now treats this-property assignments more like the JS implementation: self-referential writes are excluded from the declared type, and empty-array cases are widened to any[] with an implicit-any diagnostic when needed. This should fix class property inference in common patterns like this.foo = [this.foo[0] * 2] and avoid producing never/empty unions when no usable initializer type is present.

Other misc changes

  • Added regression coverage for this property assignment typing.
  • Updated baseline outputs for errors, symbols, and types.