2016-09-26 18:33:08 +02:00
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// @target: es5
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let o = { a: 1, b: 'no' }
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/// private propagates
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class PrivateOptionalX {
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private x?: number;
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}
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class PublicX {
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public x: number;
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}
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let privateOptionalx: PrivateOptionalX;
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let publicx: PublicX;
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let o3 = { ...publicx, ...privateOptionalx };
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let sn: string | number = o3.x; // error, x is private
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let optionalString: { sn?: string };
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let optionalNumber: { sn?: number };
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let allOptional: { sn: string | number } = { ...optionalString, ...optionalNumber };
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// error, 'sn' is optional in source, required in target
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// assignability as target
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interface Bool { b: boolean };
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interface Str { s: string };
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let spread: { ...Bool, ...Str } = { s: 'foo' }; // error, missing 'b'
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let b: Bool;
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spread = b; // error, missing 's'
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// expressions are not allowed
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let o1 = { ...1 + 1 };
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let o2 = { ...(1 + 1) };
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// literal repeats are not allowed, but spread repeats are fine
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let duplicated = { b: 'bad', ...o, b: 'bad', ...o2, b: 'bad' }
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let duplicatedSpread = { ...o, ...o }
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// write-only properties get skipped
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let setterOnly = { ...{ set b (bad: number) { } } };
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setterOnly.b = 12; // error, 'b' does not exist
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// methods are skipped because they aren't enumerable
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class C { p = 1; m() { } }
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let c: C = new C()
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let spreadC = { ...c }
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spreadC.m(); // error 'm' is not in '{ ... c }'
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let callableConstructableSpread: { ...PublicX, (n: number): number, new (p: number) };
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callableConstructableSpread(12); // error, no call signature
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new callableConstructableSpread(12); // error, no construct signature
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let callableSpread = { ...publicx, ...(n => n + 1) }; // error, can't spread functions
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2016-10-04 00:49:23 +02:00
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// { ...U } is not assignable to U
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function override<U>(initial: U, override: U): U {
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return { ...initial, ...override };
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}
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