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20 lines
511 B
TypeScript
20 lines
511 B
TypeScript
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// @strictNullChecks: true
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function f(x: { y: string } | undefined): { y: string } {
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return { y: 123, ...x } // y: string | number
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}
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f(undefined)
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function g(t?: { a: number } | null): void {
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let b = { ...t };
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let c: number = b.a; // might not have 'a'
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}
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g()
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g(undefined)
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g(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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var x = { ...nullAndUndefinedUnion, ...nullAndUndefinedUnion };
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var y = { ...nullAndUndefinedUnion };
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