65 lines
2.1 KiB
TypeScript
65 lines
2.1 KiB
TypeScript
//// [arrayOfSubtypeIsAssignableToReadonlyArray.ts]
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class A { a }
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class B extends A { b }
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class C<T> extends Array<T> { c }
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declare var ara: A[];
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declare var arb: B[];
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declare var cra: C<A>;
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declare var crb: C<B>;
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declare var rra: ReadonlyArray<A>;
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declare var rrb: ReadonlyArray<B>;
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rra = ara;
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rrb = arb; // OK, Array<B> is assignable to ReadonlyArray<A>
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rra = arb;
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rrb = ara; // error: 'A' is not assignable to 'B'
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rra = cra;
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rra = crb; // OK, C<B> is assignable to ReadonlyArray<A>
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rrb = crb;
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rrb = cra; // error: 'A' is not assignable to 'B'
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//// [arrayOfSubtypeIsAssignableToReadonlyArray.js]
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
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return extendStatics(d, b);
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};
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return function (d, b) {
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if (typeof b !== "function" && b !== null)
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throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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var A = /** @class */ (function () {
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function A() {
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}
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return A;
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}());
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var B = /** @class */ (function (_super) {
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__extends(B, _super);
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function B() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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return B;
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}(A));
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var C = /** @class */ (function (_super) {
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__extends(C, _super);
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function C() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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return C;
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}(Array));
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rra = ara;
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rrb = arb; // OK, Array<B> is assignable to ReadonlyArray<A>
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rra = arb;
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rrb = ara; // error: 'A' is not assignable to 'B'
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rra = cra;
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rra = crb; // OK, C<B> is assignable to ReadonlyArray<A>
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rrb = crb;
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rrb = cra; // error: 'A' is not assignable to 'B'
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