35 lines
1.7 KiB
Text
35 lines
1.7 KiB
Text
=== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithOptionalProperties.ts ===
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// subtyping is not transitive due to optional properties but the subtyping algorithm assumes it is for the 99% case
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// returns { s?: number; }
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function f<T>(a: T) {
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>f : Symbol(f, Decl(subtypingWithOptionalProperties.ts, 0, 0))
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>T : Symbol(T, Decl(subtypingWithOptionalProperties.ts, 3, 11))
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>a : Symbol(a, Decl(subtypingWithOptionalProperties.ts, 3, 14))
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>T : Symbol(T, Decl(subtypingWithOptionalProperties.ts, 3, 11))
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var b: { s?: number } = a;
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>b : Symbol(b, Decl(subtypingWithOptionalProperties.ts, 4, 7))
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>s : Symbol(s, Decl(subtypingWithOptionalProperties.ts, 4, 12))
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>a : Symbol(a, Decl(subtypingWithOptionalProperties.ts, 3, 14))
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return b;
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>b : Symbol(b, Decl(subtypingWithOptionalProperties.ts, 4, 7))
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}
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var r = f({ s: new Object() }); // ok
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>r : Symbol(r, Decl(subtypingWithOptionalProperties.ts, 8, 3))
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>f : Symbol(f, Decl(subtypingWithOptionalProperties.ts, 0, 0))
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>s : Symbol(s, Decl(subtypingWithOptionalProperties.ts, 8, 11))
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>Object : Symbol(Object, Decl(lib.d.ts, 92, 1), Decl(lib.d.ts, 223, 11))
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r.s && r.s.toFixed(); // would blow up at runtime
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>r.s : Symbol(s, Decl(subtypingWithOptionalProperties.ts, 4, 12))
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>r : Symbol(r, Decl(subtypingWithOptionalProperties.ts, 8, 3))
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>s : Symbol(s, Decl(subtypingWithOptionalProperties.ts, 4, 12))
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>r.s.toFixed : Symbol(Number.toFixed, Decl(lib.d.ts, 463, 37))
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>r.s : Symbol(s, Decl(subtypingWithOptionalProperties.ts, 4, 12))
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>r : Symbol(r, Decl(subtypingWithOptionalProperties.ts, 8, 3))
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>s : Symbol(s, Decl(subtypingWithOptionalProperties.ts, 4, 12))
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>toFixed : Symbol(Number.toFixed, Decl(lib.d.ts, 463, 37))
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