microsoft / microsoft/TypeScript
Ignore __proto__
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Description
TypeScript Version: 2.2.0
Code:
{ __proto__: {} } as { [key: string]: string }
Expected behavior:
Ok
Actual behavior:
Type '{ __proto__: {}; }' cannot be converted to type '{ [key: string]: string; }'.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the TypeScript 2.2.0 example { __proto__: {} } as { [key: string]: string } and trace how the type checker handles this object property during the assertion. Done means the example is accepted without weakening the expected index-signature checks.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100