66 lines
1.7 KiB
Text
66 lines
1.7 KiB
Text
=== tests/cases/conformance/types/spread/spreadUnion3.ts ===
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function f(x: { y: string } | undefined): { y: string } {
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>f : (x: { y: string; } | undefined) => { y: string; }
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>x : { y: string; } | undefined
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>y : string
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>y : string
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return { y: 123, ...x } // y: string | number
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>{ y: 123, ...x } : { y: number; } | { y: string; }
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>y : number
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>123 : 123
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>x : { y: string; } | undefined
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}
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f(undefined)
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>f(undefined) : { y: string; }
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>f : (x: { y: string; } | undefined) => { y: string; }
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>undefined : undefined
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function g(t?: { a: number } | null): void {
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>g : (t?: { a: number; } | null | undefined) => void
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>t : { a: number; } | null | undefined
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>a : number
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>null : null
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let b = { ...t };
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>b : {}
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>{ ...t } : {} | {} | { a: number; }
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>t : { a: number; } | null | undefined
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let c: number = b.a; // might not have 'a'
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>c : number
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>b.a : any
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>b : {}
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>a : any
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}
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g()
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>g() : void
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>g : (t?: { a: number; } | null | undefined) => void
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g(undefined)
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>g(undefined) : void
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>g : (t?: { a: number; } | null | undefined) => void
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>undefined : undefined
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g(null)
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>g(null) : void
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>g : (t?: { a: number; } | null | undefined) => void
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>null : null
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// spreading nothing but null and undefined is not allowed
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declare const nullAndUndefinedUnion: null | undefined;
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>nullAndUndefinedUnion : null | undefined
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>null : null
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var x = { ...nullAndUndefinedUnion, ...nullAndUndefinedUnion };
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>x : any
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>{ ...nullAndUndefinedUnion, ...nullAndUndefinedUnion } : any
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>nullAndUndefinedUnion : null | undefined
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>nullAndUndefinedUnion : null | undefined
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var y = { ...nullAndUndefinedUnion };
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>y : any
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>{ ...nullAndUndefinedUnion } : any
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>nullAndUndefinedUnion : null | undefined
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