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=== tests/cases/conformance/types/mapped/recursiveMappedTypes.ts ===
// Recursive mapped types simply appear empty
type Recurse = {
>Recurse : any
[K in keyof Recurse]: Recurse[K]
}
type Recurse1 = {
>Recurse1 : any
[K in keyof Recurse2]: Recurse2[K]
}
type Recurse2 = {
>Recurse2 : any
[K in keyof Recurse1]: Recurse1[K]
}
// Repro from #27881
export type Circular<T> = {[P in keyof T]: Circular<T>};
>Circular : Circular<T>
type tup = [number, number, number, number];
>tup : [number, number, number, number]
function foo(arg: Circular<tup>): tup {
>foo : (arg: any) => tup
>arg : any
return arg;
>arg : any
}
// Repro from #29442
type DeepMap<T extends unknown[], R> = {
>DeepMap : DeepMap<T, R>
[K in keyof T]: T[K] extends unknown[] ? DeepMap<T[K], R> : R;
};
type tpl = [string, [string, [string]]];
>tpl : [string, [string, [string]]]
type arr = string[][];
>arr : string[][]
type t1 = DeepMap<tpl, number>; // [number, [number, [number]]]
>t1 : [number, [number, [number]]]
type t2 = DeepMap<arr, number>; // number[][]
>t2 : number[][]
// Repro from #29577
type Transform<T> = { [K in keyof T]: Transform<T[K]> };
>Transform : Transform<T>
interface User {
avatar: string;
>avatar : string
}
interface Guest {
displayName: string;
>displayName : string
}
interface Product {
users: (User | Guest)[];
>users : (User | Guest)[]
}
declare var product: Transform<Product>;
>product : Transform<Product>
product.users; // (Transform<User> | Transform<Guest>)[]
>product.users : Transform<User | Guest>[]
>product : Transform<Product>
>users : Transform<User | Guest>[]
// Repro from #29702
type Remap1<T> = { [P in keyof T]: Remap1<T[P]>; };
>Remap1 : Remap1<T>
type Remap2<T> = T extends object ? { [P in keyof T]: Remap2<T[P]>; } : T;
>Remap2 : Remap2<T>
type a = Remap1<string[]>; // string[]
>a : string[]
type b = Remap2<string[]>; // string[]
>b : string[]
// Repro from #29992
type NonOptionalKeys<T> = { [P in keyof T]: undefined extends T[P] ? never : P }[keyof T];
>NonOptionalKeys : NonOptionalKeys<T>
type Child<T> = { [P in NonOptionalKeys<T>]: T[P] }
>Child : Child<T>
export interface ListWidget {
"type": "list",
>"type" : "list"
"minimum_count": number,
>"minimum_count" : number
"maximum_count": number,
>"maximum_count" : number
"collapsable"?: boolean, //default to false, means all expanded
>"collapsable" : boolean
"each": Child<ListWidget>;
>"each" : any
}
type ListChild = Child<ListWidget>
>ListChild : { [x: string]: any; }
declare let x: ListChild;
>x : ListChild
x.type;
>x.type : any
>x : ListChild
>type : any
// Repros from #41790
export type TV<T, K extends keyof T> = T[K] extends Record<infer E, any> ? E : never;
>TV : TV<T, K>
export type ObjectOrArray<T, K extends keyof any = keyof any> = T[] | Record<K, T | Record<K, T> | T[]>;
>ObjectOrArray : ObjectOrArray<T, K>
export type ThemeValue<K extends keyof ThemeType, ThemeType, TVal = any> =
>ThemeValue : ThemeValue<K, ThemeType, TVal>
ThemeType[K] extends TVal[] ? number :
ThemeType[K] extends Record<infer E, TVal> ? E :
ThemeType[K] extends ObjectOrArray<infer F> ? F : never;
export type Foo<T> = T extends { [P in infer E]: any } ? E : never;
>Foo : Foo<T>
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