5 lines
273 B
TypeScript
5 lines
273 B
TypeScript
function foo(x: { id: number; name?: string; }): void;
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foo({ id: 1234 }); // Ok
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foo({ id: 1234, name: "hello" }); // Ok
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foo({ id: 1234, name: false }); // Error, name of wrong type
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foo({ name: "hello" }); // Error, id required but missing
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