d45e422b46
typeMaybeAssignableTo. typeMaybeAssignableTo decomposed unions at the top level of the assigned type but didn't properly handle other unions that arose during assignability checking, e.g., in the constraint of a generic lookup type. Fixes #26130.
41 lines
2.1 KiB
Plaintext
41 lines
2.1 KiB
Plaintext
=== tests/cases/conformance/expressions/assignmentOperator/assignmentGenericLookupTypeNarrowing.ts ===
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// Repro from #26130
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let mappedObject: {[K in "foo"]: null | {x: string}} = {foo: {x: "hello"}};
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>mappedObject : Symbol(mappedObject, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 3))
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>K : Symbol(K, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 20))
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>x : Symbol(x, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 41))
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>foo : Symbol(foo, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 56))
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>x : Symbol(x, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 62))
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declare function foo<T>(x: T): null | T;
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>foo : Symbol(foo, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 75))
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>T : Symbol(T, Decl(assignmentGenericLookupTypeNarrowing.ts, 3, 21))
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>x : Symbol(x, Decl(assignmentGenericLookupTypeNarrowing.ts, 3, 24))
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>T : Symbol(T, Decl(assignmentGenericLookupTypeNarrowing.ts, 3, 21))
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>T : Symbol(T, Decl(assignmentGenericLookupTypeNarrowing.ts, 3, 21))
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function bar<K extends "foo">(key: K) {
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>bar : Symbol(bar, Decl(assignmentGenericLookupTypeNarrowing.ts, 3, 40))
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>K : Symbol(K, Decl(assignmentGenericLookupTypeNarrowing.ts, 5, 13))
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>key : Symbol(key, Decl(assignmentGenericLookupTypeNarrowing.ts, 5, 30))
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>K : Symbol(K, Decl(assignmentGenericLookupTypeNarrowing.ts, 5, 13))
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const element = foo(mappedObject[key]);
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>element : Symbol(element, Decl(assignmentGenericLookupTypeNarrowing.ts, 6, 7))
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>foo : Symbol(foo, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 75))
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>mappedObject : Symbol(mappedObject, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 3))
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>key : Symbol(key, Decl(assignmentGenericLookupTypeNarrowing.ts, 5, 30))
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if (element == null)
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>element : Symbol(element, Decl(assignmentGenericLookupTypeNarrowing.ts, 6, 7))
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return;
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const x = element.x;
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>x : Symbol(x, Decl(assignmentGenericLookupTypeNarrowing.ts, 9, 7))
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>element.x : Symbol(x, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 41))
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>element : Symbol(element, Decl(assignmentGenericLookupTypeNarrowing.ts, 6, 7))
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>x : Symbol(x, Decl(assignmentGenericLookupTypeNarrowing.ts, 2, 41))
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}
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