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4.9 regression: unexpected error using in operator on generic object intersected with {}Β #51549
Description
Bug Report
π Search Terms
inoperator- generic
- object
π Version & Regression Information
- This changed between versions 4.8 and 4.9
β― Playground Link
Playground link with relevant code
π» Code
const f = <P extends object>(a: P & {}) => {
// Unexpected error:
// Type 'P & {}' may represent a primitive value, which is not permitted as the right operand of the 'in' operator.ts(2638)
"foo" in a;
};π Actual behavior
See code comment above.
π Expected behavior
See code comment above.
Activity
fatcerberus commentedon Nov 16, 2022
Duplicate of #51501 (
NonNullable<T>is defined asT & {}so it's the same issue) and the fix is #51502Andarist commentedon Nov 16, 2022
I can confirm that my PR fixes this issue. I've pushed out this repro case as an additional test case: 42ac98e