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No excess properties error on function return type #37017
Description
TypeScript Version: Nightly, 3.7.5
Search Terms: excess property, computed property
Code
const a = <T>(shape: T | (() => T)): T => {
return shape instanceof Function ? shape() : shape;
}
//Case 1
a<{ x: string }>(() => ({ x: '', o: '' })); // I expect this to fail
//Case 2
a<{ x: string }>({ x: '', o: '' }); // Fails as expectedExpected behavior:
I expect Case 1 to show error similar to Case 2 because returned object contains more properties than described in generic type.
Actual behavior:
Case 1 is a valid typescript
Playground Link: Playground Link
Activity
IllusionMH commentedon Feb 25, 2020
Duplicate of #12632 which requires #241
(Sorry if couple of comments were posted - GH had issues with API)
typescript-bot commentedon Feb 28, 2020
This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.