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