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TypeScript 3.0 improved error UX meta-issue #25310

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DanielRosenwasser opened this Issue Jun 28, 2018 · 0 comments

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DanielRosenwasser commented Jun 28, 2018

In TypeScript 3.0, we're aiming for a better error message experience all around.

One of the related efforts we've been working on is related error spans: #25257.

However, in addition to that, we've received enough constructive feedback about error messages that we can act on.

TypeScript 3.0

  • Better JSX attribute errors (#23117)
  • Better errors on object properties (#22170, #25030)
  • Smarter elaborations when assigning Foo<T> to Foo<U> | Bar<V> (#24776)
  • Smarter elaborations when assigning objects to Foo | Bar[] (#25750 )
  • Better guidance for non-existent deep imports (#24781)
  • Better errors on always true/false conditions (#25245)
  • Smarter elaborations against Foo | null | undefined (#25086)
  • Better truncation on big types (#24778)
  • Better duplicate declaration errors (#25324)

TypeScript 3.x

These suggested improvements didn't make it in time for 3.0, but we'll hopefully continue working on them! Check out #26077 to keep track of them.

  • Better hints for uncalled types (#25308)
  • Better hints for 'cannot find name' errors (#25309)
  • Better errors on weak type intersections like IntrinsicAttributes (#24146 🏃)
  • Better errors when matching implementation signatures (#25488)

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