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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…xpression of a generic nullable type
typescript-bot
added
the
For Uncommitted Bug
ahejlsberg
requested changes
Nov 21, 2022
src/compiler/checker.ts
Outdated
| 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.
typescript-bot
added
For Milestone Bug
ahejlsberg
approved these changes
Nov 21, 2022
|
Could/should this be cherry picked to 4.9 branch? |
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fixes #51501
fixes #51549