44 lines
1.1 KiB
TypeScript
44 lines
1.1 KiB
TypeScript
//// [spreadUnion3.ts]
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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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//// [spreadUnion3.js]
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var __assign = (this && this.__assign) || Object.assign || function(t) {
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for (var s, i = 1, n = arguments.length; i < n; i++) {
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s = arguments[i];
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for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
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t[p] = s[p];
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}
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return t;
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};
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function f(x) {
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return __assign({ y: 123 }, x); // y: string | number
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}
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f(undefined);
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function g(t) {
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var b = __assign({}, t);
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var c = 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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var x = __assign({}, nullAndUndefinedUnion, nullAndUndefinedUnion);
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var y = __assign({}, nullAndUndefinedUnion);
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