39 lines
2.9 KiB
TypeScript
39 lines
2.9 KiB
TypeScript
//// [destructuringVariableDeclaration2.ts]
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// The type T associated with a destructuring variable declaration is determined as follows:
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// If the declaration includes a type annotation, T is that type.
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var {a1, a2}: { a1: number, a2: string } = { a1: true, a2: 1 } // Error
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var [a3, [[a4]], a5]: [number, [[string]], boolean] = [1, [[false]], true]; // Error
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// The type T associated with a destructuring variable declaration is determined as follows:
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// Otherwise, if the declaration includes an initializer expression, T is the type of that initializer expression.
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var temp = { t1: true, t2: "false" };
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var [b0 = 3, b1 = true, b2 = temp] = [3, false, { t1: false, t2: 5}]; // Error
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// The type T associated with a binding element is determined as follows:
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// If the binding element is a rest element, T is an array type with
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// an element type E, where E is the type of the numeric index signature of S.
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var [c1, c2, { c3: c4, c5 }, , ...c6] = [1, 2, { c3: 4, c5: 0 }]; // Error
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// When a destructuring variable declaration, binding property, or binding element specifies
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// an initializer expression, the type of the initializer expression is required to be assignable
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// to the widened form of the type associated with the destructuring variable declaration, binding property, or binding element.
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var {d: {d1 = ["string", null]}}: { d: { d1: number[] } } = { d: { d1: [1, 2] } }; // Error
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//// [destructuringVariableDeclaration2.js]
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// The type T associated with a destructuring variable declaration is determined as follows:
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// If the declaration includes a type annotation, T is that type.
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var _a = { a1: true, a2: 1 }, a1 = _a.a1, a2 = _a.a2; // Error
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var _b = [1, [[false]], true], a3 = _b[0], a4 = _b[1][0][0], a5 = _b[2]; // Error
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// The type T associated with a destructuring variable declaration is determined as follows:
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// Otherwise, if the declaration includes an initializer expression, T is the type of that initializer expression.
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var temp = { t1: true, t2: "false" };
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var _c = [3, false, { t1: false, t2: 5 }], _d = _c[0], b0 = _d === void 0 ? 3 : _d, _e = _c[1], b1 = _e === void 0 ? true : _e, _f = _c[2], b2 = _f === void 0 ? temp : _f; // Error
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// The type T associated with a binding element is determined as follows:
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// If the binding element is a rest element, T is an array type with
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// an element type E, where E is the type of the numeric index signature of S.
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var _g = [1, 2, { c3: 4, c5: 0 }], c1 = _g[0], c2 = _g[1], _h = _g[2], c4 = _h.c3, c5 = _h.c5, c6 = _g.slice(4); // Error
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// When a destructuring variable declaration, binding property, or binding element specifies
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// an initializer expression, the type of the initializer expression is required to be assignable
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// to the widened form of the type associated with the destructuring variable declaration, binding property, or binding element.
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var _j = { d: { d1: [1, 2] } }.d.d1, d1 = _j === void 0 ? ["string", null] : _j; // Error
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