82 lines
1.8 KiB
TypeScript
82 lines
1.8 KiB
TypeScript
// @declaration: true
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// Recursive mapped types simply appear empty
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type Recurse = {
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[K in keyof Recurse]: Recurse[K]
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}
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type Recurse1 = {
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[K in keyof Recurse2]: Recurse2[K]
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}
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type Recurse2 = {
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[K in keyof Recurse1]: Recurse1[K]
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}
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// Repro from #27881
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export type Circular<T> = {[P in keyof T]: Circular<T>};
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type tup = [number, number, number, number];
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function foo(arg: Circular<tup>): tup {
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return arg;
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}
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// Repro from #29442
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type DeepMap<T extends unknown[], R> = {
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[K in keyof T]: T[K] extends unknown[] ? DeepMap<T[K], R> : R;
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};
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type tpl = [string, [string, [string]]];
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type arr = string[][];
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type t1 = DeepMap<tpl, number>; // [number, [number, [number]]]
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type t2 = DeepMap<arr, number>; // number[][]
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// Repro from #29577
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type Transform<T> = { [K in keyof T]: Transform<T[K]> };
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interface User {
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avatar: string;
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}
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interface Guest {
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displayName: string;
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}
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interface Product {
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users: (User | Guest)[];
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}
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declare var product: Transform<Product>;
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product.users; // (Transform<User> | Transform<Guest>)[]
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// Repro from #29702
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type Remap1<T> = { [P in keyof T]: Remap1<T[P]>; };
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type Remap2<T> = T extends object ? { [P in keyof T]: Remap2<T[P]>; } : T;
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type a = Remap1<string[]>; // string[]
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type b = Remap2<string[]>; // string[]
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// Repro from #29992
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type NonOptionalKeys<T> = { [P in keyof T]: undefined extends T[P] ? never : P }[keyof T];
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type Child<T> = { [P in NonOptionalKeys<T>]: T[P] }
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export interface ListWidget {
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"type": "list",
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"minimum_count": number,
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"maximum_count": number,
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"collapsable"?: boolean, //default to false, means all expanded
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"each": Child<ListWidget>;
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}
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type ListChild = Child<ListWidget>
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declare let x: ListChild;
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x.type;
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