96 lines
2.3 KiB
TypeScript
96 lines
2.3 KiB
TypeScript
// @strictNullChecks: true
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// @declaration: true
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function verifyLibTypes<T, K extends keyof T, U>() {
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var x1: Partial<T>;
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var x1: { [P in keyof T]?: T[P] };
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var x2: Readonly<T>;
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var x2: { readonly [P in keyof T]: T[P] };
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var x3: Pick<T, K>;
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var x3: { [P in K]: T[P] };
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var x4: Record<K, U>;
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var x4: { [P in K]: U };
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}
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type Proxy<T> = {
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get(): T;
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set(value: T): void;
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}
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type Proxify<T> = {
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[P in keyof T]: Proxy<T[P]>;
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}
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type DeepReadonly<T> = {
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readonly [P in keyof T]: DeepReadonly<T[P]>;
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};
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declare function assign<T>(obj: T, props: Partial<T>): void;
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declare function freeze<T>(obj: T): Readonly<T>;
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declare function pick<T, K extends keyof T>(obj: T, ...keys: K[]): Pick<T, K>;
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declare function mapObject<K extends string, T, U>(obj: Record<K, T>, f: (x: T) => U): Record<K, U>;
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declare function proxify<T>(obj: T): Proxify<T>;
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interface Point {
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x: number;
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y: number;
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}
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interface Shape {
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name: string;
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width: number;
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height: number;
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location: Point;
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}
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interface PartialShape {
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name?: string;
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width?: number;
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height?: number;
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location?: Point;
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}
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interface ReadonlyShape {
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readonly name: string;
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readonly width: number;
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readonly height: number;
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readonly location: Point;
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}
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function f0(s1: Shape, s2: Shape) {
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assign(s1, { name: "circle" });
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assign(s2, { width: 10, height: 20 });
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}
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function f1(shape: Shape) {
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var frozen: ReadonlyShape;
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var frozen: Readonly<Shape>;
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var frozen = freeze(shape);
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}
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function f2(shape: Shape) {
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var partial: PartialShape;
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var partial: Partial<Shape>;
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var partial: Partial<Shape> = {};
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}
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function f3(shape: Shape) {
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const x = pick(shape, "name", "location"); // { name: string, location: Point }
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}
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function f4() {
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const rec = { foo: "hello", bar: "world", baz: "bye" };
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const lengths = mapObject(rec, s => s.length); // { foo: number, bar: number, baz: number }
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}
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function f5(shape: Shape) {
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const p = proxify(shape);
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let name = p.name.get();
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p.width.set(42);
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}
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function f6(shape: DeepReadonly<Shape>) {
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let name = shape.name; // string
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let location = shape.location; // DeepReadonly<Point>
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let x = location.x; // number
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} |