Fixed an issue with in not being able to be used on narrowed down expression of a generic nullable type#51502
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ahejlsberg merged 3 commits intomicrosoft:mainfrom Nov 22, 2022
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…xpression of a generic nullable type
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It's the right fix, but shorter with the suggested change.
src/compiler/checker.ts
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| const constraint = getBaseConstraintOfType(rightType); | ||
| if (!constraint || isEmptyAnonymousObjectType(constraint)) { | ||
| error(right, Diagnostics.Type_0_may_represent_a_primitive_value_which_is_not_permitted_as_the_right_operand_of_the_in_operator, typeToString(rightType)); | ||
| } |
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Instead of adding these lines of code, I'd suggest modifying hasEmptyObjectIntersection to
function hasEmptyObjectIntersection(type: Type): boolean {
return someType(type, t => t === unknownEmptyObjectType || !!(t.flags & TypeFlags.Intersection) && isEmptyAnonymousObjectType(getBaseConstraintOrType(t)));
}Accomplishes the same thing with less code.
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Nice, I've pushed out the requested change.
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Could/should this be cherry picked to 4.9 branch? |
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fixes #51501
fixes #51549