74 lines
1.6 KiB
TypeScript
74 lines
1.6 KiB
TypeScript
// @strictNullChecks: true
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// @declaration: true
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type Box<T> = {
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};
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type Boxified<T> = {
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[P in keyof T]: Box<T[P]>;
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};
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function boxify<T>(obj: T): Boxified<T> {
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if (typeof obj === "object") {
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let result = {} as Boxified<T>;
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for (let k in obj) {
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result[k] = { value: obj[k] };
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}
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return result;
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}
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return <any>obj;
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}
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type A = { a: string };
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type B = { b: string };
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type C = { c: string };
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function f1(x: A | B | C | undefined) {
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return boxify(x);
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}
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type T00 = Partial<A | B | C>;
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type T01 = Readonly<A | B | C | null | undefined>;
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type T02 = Boxified<A | B[] | C | string>
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type T03 = Readonly<string | number | boolean | null | undefined | void>;
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type T04 = Boxified<string | number | boolean | null | undefined | void>;
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type T05 = Partial<"hello" | "world" | 42>;
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type BoxifiedWithSentinel<T, U> = {
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[P in keyof T]: Box<T[P]> | U;
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}
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type T10 = BoxifiedWithSentinel<A | B | C, null>;
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type T11 = BoxifiedWithSentinel<A | B | C, undefined>;
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type T12 = BoxifiedWithSentinel<string, undefined>;
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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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type Foo = {
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x: number;
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y: { a: string, b: number };
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z: boolean;
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};
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type DeepReadonlyFoo = {
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readonly x: number;
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readonly y: { readonly a: string, readonly b: number };
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readonly z: boolean;
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};
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var x1: DeepReadonly<Foo>;
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var x1: DeepReadonlyFoo;
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// Repro from #13232
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type Z = { a: number };
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type Clone<T> = {
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[P in keyof (T & {})]: T[P];
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};
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type M = Clone<Z>; // M should be { a: number }
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var z1: Z;
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var z1: Clone<Z>;
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