18 lines
959 B
TypeScript
18 lines
959 B
TypeScript
// In a typed function call, argument expressions are contextually typed by their corresponding parameter types.
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function foo({x: [a, b], y: {c, d, e}}) { }
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function bar({x: [a, b = 10], y: {c, d, e = { f:1 }}}) { }
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function baz(x: [string, number, boolean]) { }
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var o = { x: ["string", 1], y: { c: true, d: "world", e: 3 } };
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var o1: { x: [string, number], y: { c: boolean, d: string, e: number } } = { x: ["string", 1], y: { c: true, d: "world", e: 3 } };
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foo(o1); // Not error since x has contextual type of tuple namely [string, number]
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foo({ x: ["string", 1], y: { c: true, d: "world", e: 3 } }); // Not error
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var array = ["string", 1, true];
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var tuple: [string, number, boolean] = ["string", 1, true];
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baz(tuple);
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baz(["string", 1, true]);
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baz(array); // Error
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baz(["string", 1, true, ...array]); // Error
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foo(o); // Error because x has an array type namely (string|number)[]
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