microsoft / microsoft/TypeScript

Better type printing for JSX IntrinsicElements

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Description

Search Terms

JSX IntrinsicElements print

Suggestion

When printing JSX IntrinsicElements related types, prefer the tag name

Use Cases

Examples

const z1 = <a class="" />;

Now:

Type '{ class: string; }' is not assignable to type 'DetailedHTMLProps<AnchorHTMLAttributes<HTMLAnchorElement>, HTMLAnchorElement>'.

Suggest:

Type '{ class: string; }' is not assignable to type '<a />'.

This will make the error message easier to understand

Checklist

My suggestion meets these guidelines:

  • This wouldn't be a breaking change in existing TypeScript/JavaScript code
  • This wouldn't change the runtime behavior of existing JavaScript code
  • This could be implemented without emitting different JS based on the types of the expressions
  • This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
  • This feature would agree with the rest of TypeScript's Design Goals.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

The issue names no files, tests, or entry points. Start by locating the compiler's JSX IntrinsicElements diagnostic and type-printing paths, then compare their output for the provided example. Done means the diagnostic uses the tag-name form while preserving the requested type-checking behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
25/100

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