=== tests/cases/conformance/types/mapped/mappedTypeAsClauses.ts ===
// Mapped type 'as N' clauses

type Getters<T> = { [P in keyof T & string as `get${Capitalize<P>}`]: () => T[P] };
>Getters : Getters<T>

type TG1 = Getters<{ foo: string, bar: number, baz: { z: boolean } }>;
>TG1 : { getFoo: () => string; getBar: () => number; getBaz: () => { z: boolean; }; }
>foo : string
>bar : number
>baz : { z: boolean; }
>z : boolean

// Mapped type with 'as N' clause has no constraint on 'in T' clause

type PropDef<K extends keyof any, T> = { name: K, type: T };
>PropDef : PropDef<K, T>
>name : K
>type : T

type TypeFromDefs<T extends PropDef<keyof any, any>> = { [P in T as P['name']]: P['type'] };
>TypeFromDefs : TypeFromDefs<T>

type TP1 = TypeFromDefs<{ name: 'a', type: string } | { name: 'b', type: number } | { name: 'a', type: boolean }>;
>TP1 : { a: string | boolean; b: number; }
>name : "a"
>type : string
>name : "b"
>type : number
>name : "a"
>type : boolean

// No array or tuple type mapping when 'as N' clause present

type TA1 = Getters<string[]>;
>TA1 : { getConcat: () => { (...items: ConcatArray<string>[]): string[]; (...items: (string | ConcatArray<string>)[]): string[]; }; getIndexOf: () => (searchElement: string, fromIndex?: number | undefined) => number; getLastIndexOf: () => (searchElement: string, fromIndex?: number | undefined) => number; getSlice: () => (start?: number | undefined, end?: number | undefined) => string[]; getLength: () => number; getToString: () => () => string; getToLocaleString: () => () => string; getPop: () => () => string | undefined; getPush: () => (...items: string[]) => number; getJoin: () => (separator?: string | undefined) => string; getReverse: () => () => string[]; getShift: () => () => string | undefined; getSort: () => (compareFn?: ((a: string, b: string) => number) | undefined) => string[]; getSplice: () => { (start: number, deleteCount?: number | undefined): string[]; (start: number, deleteCount: number, ...items: string[]): string[]; }; getUnshift: () => (...items: string[]) => number; getEvery: () => { <S extends string>(predicate: (value: string, index: number, array: string[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: string, index: number, array: string[]) => unknown, thisArg?: any): boolean; }; getSome: () => (predicate: (value: string, index: number, array: string[]) => unknown, thisArg?: any) => boolean; getForEach: () => (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void; getMap: () => <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any) => U[]; getFilter: () => { <S extends string>(predicate: (value: string, index: number, array: string[]) => value is S, thisArg?: any): S[]; (predicate: (value: string, index: number, array: string[]) => unknown, thisArg?: any): string[]; }; getReduce: () => { (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: string[]) => string): string; (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: string[]) => string, initialValue: string): string; <U>(callbackfn: (previousValue: U, currentValue: string, currentIndex: number, array: string[]) => U, initialValue: U): U; }; getReduceRight: () => { (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: string[]) => string): string; (callbackfn: (previousValue: string, currentValue: string, currentIndex: number, array: string[]) => string, initialValue: string): string; <U>(callbackfn: (previousValue: U, currentValue: string, currentIndex: number, array: string[]) => U, initialValue: U): U; }; }

type TA2 = Getters<[number, boolean]>;
>TA2 : { getConcat: () => { (...items: ConcatArray<number | boolean>[]): (number | boolean)[]; (...items: (number | boolean | ConcatArray<number | boolean>)[]): (number | boolean)[]; }; getIndexOf: () => (searchElement: number | boolean, fromIndex?: number | undefined) => number; getLastIndexOf: () => (searchElement: number | boolean, fromIndex?: number | undefined) => number; getSlice: () => (start?: number | undefined, end?: number | undefined) => (number | boolean)[]; getLength: () => 2; getToString: () => () => string; getToLocaleString: () => () => string; getPop: () => () => number | boolean | undefined; getPush: () => (...items: (number | boolean)[]) => number; getJoin: () => (separator?: string | undefined) => string; getReverse: () => () => (number | boolean)[]; getShift: () => () => number | boolean | undefined; getSort: () => (compareFn?: ((a: number | boolean, b: number | boolean) => number) | undefined) => [number, boolean]; getSplice: () => { (start: number, deleteCount?: number | undefined): (number | boolean)[]; (start: number, deleteCount: number, ...items: (number | boolean)[]): (number | boolean)[]; }; getUnshift: () => (...items: (number | boolean)[]) => number; getEvery: () => { <S extends number | boolean>(predicate: (value: number | boolean, index: number, array: (number | boolean)[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number | boolean, index: number, array: (number | boolean)[]) => unknown, thisArg?: any): boolean; }; getSome: () => (predicate: (value: number | boolean, index: number, array: (number | boolean)[]) => unknown, thisArg?: any) => boolean; getForEach: () => (callbackfn: (value: number | boolean, index: number, array: (number | boolean)[]) => void, thisArg?: any) => void; getMap: () => <U>(callbackfn: (value: number | boolean, index: number, array: (number | boolean)[]) => U, thisArg?: any) => U[]; getFilter: () => { <S extends number | boolean>(predicate: (value: number | boolean, index: number, array: (number | boolean)[]) => value is S, thisArg?: any): S[]; (predicate: (value: number | boolean, index: number, array: (number | boolean)[]) => unknown, thisArg?: any): (number | boolean)[]; }; getReduce: () => { (callbackfn: (previousValue: number | boolean, currentValue: number | boolean, currentIndex: number, array: (number | boolean)[]) => number | boolean): number | boolean; (callbackfn: (previousValue: number | boolean, currentValue: number | boolean, currentIndex: number, array: (number | boolean)[]) => number | boolean, initialValue: number | boolean): number | boolean; <U>(callbackfn: (previousValue: U, currentValue: number | boolean, currentIndex: number, array: (number | boolean)[]) => U, initialValue: U): U; }; getReduceRight: () => { (callbackfn: (previousValue: number | boolean, currentValue: number | boolean, currentIndex: number, array: (number | boolean)[]) => number | boolean): number | boolean; (callbackfn: (previousValue: number | boolean, currentValue: number | boolean, currentIndex: number, array: (number | boolean)[]) => number | boolean, initialValue: number | boolean): number | boolean; <U>(callbackfn: (previousValue: U, currentValue: number | boolean, currentIndex: number, array: (number | boolean)[]) => U, initialValue: U): U; }; get0: () => number; get1: () => boolean; }

// Filtering using 'as N' clause

type Methods<T> = { [P in keyof T as T[P] extends Function ? P : never]: T[P] };
>Methods : Methods<T>

type TM1 = Methods<{ foo(): number, bar(x: string): boolean, baz: string | number }>;
>TM1 : Methods<{ foo(): number; bar(x: string): boolean; baz: string | number; }>
>foo : () => number
>bar : (x: string) => boolean
>x : string
>baz : string | number

// Mapping to multiple names using 'as N' clause

type DoubleProp<T> = { [P in keyof T & string as `${P}1` | `${P}2`]: T[P] }
>DoubleProp : DoubleProp<T>

type TD1 = DoubleProp<{ a: string, b: number }>;  // { a1: string, a2: string, b1: number, b2: number }
>TD1 : { a1: string; a2: string; b1: number; b2: number; }
>a : string
>b : number

type TD2 = keyof TD1;  // 'a1' | 'a2' | 'b1' | 'b2'
>TD2 : "a1" | "b1" | "a2" | "b2"

type TD3<U> = keyof DoubleProp<U>;  // `${keyof U & string}1` | `${keyof U & string}2`
>TD3 : `${keyof U & string}1` | `${keyof U & string}2`

// Repro from #40619

type Lazyify<T> = {
>Lazyify : Lazyify<T>

    [K in keyof T as `get${Capitalize<K & string>}`]: () => T[K]
};

interface Person {
    readonly name: string;
>name : string

    age: number;
>age : number

    location?: string;
>location : string | undefined
}

type LazyPerson = Lazyify<Person>;
>LazyPerson : Lazyify<Person>

// Repro from #40833

type Example = {foo: string, bar: number};
>Example : { foo: string; bar: number; }
>foo : string
>bar : number

type PickByValueType<T, U> = {
>PickByValueType : PickByValueType<T, U>

  [K in keyof T as T[K] extends U ? K : never]: T[K]
};

type T1 = PickByValueType<Example, string>;
>T1 : PickByValueType<Example, string>

const e1: T1 = {
>e1 : PickByValueType<Example, string>
>{    foo: "hello"} : { foo: string; }

    foo: "hello"
>foo : string
>"hello" : "hello"

};
type T2 = keyof T1;
>T2 : "foo"

const e2: T2 = "foo";
>e2 : "foo"
>"foo" : "foo"

// Repro from #41133

interface Car {
    name: string;
>name : string

    seats: number;
>seats : number

    engine: Engine;
>engine : Engine

    wheels: Wheel[];
>wheels : Wheel[]
}

interface Engine {
    manufacturer: string;
>manufacturer : string

    horsepower: number;
>horsepower : number
}

interface Wheel {
    type: "summer" | "winter";
>type : "summer" | "winter"

    radius: number;
>radius : number
}

type Primitive = string | number | boolean;
>Primitive : string | number | boolean

type OnlyPrimitives<T> = { [K in keyof T as T[K] extends Primitive ? K : never]: T[K] };
>OnlyPrimitives : OnlyPrimitives<T>

let primitiveCar: OnlyPrimitives<Car>;  // { name: string; seats: number; }
>primitiveCar : OnlyPrimitives<Car>

let keys: keyof OnlyPrimitives<Car>;  //  "name" | "seats"
>keys : "name" | "seats"

type KeysOfPrimitives<T> = keyof OnlyPrimitives<T>;
>KeysOfPrimitives : keyof OnlyPrimitives<T>

let carKeys: KeysOfPrimitives<Car>;  // "name" | "seats"
>carKeys : "name" | "seats"

// Repro from #41453

type Equal<A, B> = (<T>() => T extends A ? 1 : 2) extends (<T>() => T extends B ? 1 : 2) ? true : false;
>Equal : Equal<A, B>
>true : true
>false : false

type If<Cond extends boolean, Then, Else> = Cond extends true ? Then : Else;
>If : If<Cond, Then, Else>
>true : true

type GetKey<S, V> = keyof { [TP in keyof S as Equal<S[TP], V> extends true ? TP : never]: any };
>GetKey : keyof { [TP in keyof S as Equal<S[TP], V> extends true ? TP : never]: any; }
>true : true

type GetKeyWithIf<S, V> = keyof { [TP in keyof S as If<Equal<S[TP], V>, TP, never>]: any };
>GetKeyWithIf : keyof { [TP in keyof S as If<Equal<S[TP], V>, TP, never>]: any; }

type GetObjWithIf<S, V> = { [TP in keyof S as If<Equal<S[TP], V>, TP, never>]: any };
>GetObjWithIf : GetObjWithIf<S, V>

type Task = {
>Task : { isDone: boolean; }

  isDone: boolean;
>isDone : boolean

};

type Schema = {
>Schema : { root: {    title: string;    task: Task;}; Task: Task; }

  root: {
>root : { title: string; task: Task; }

    title: string;
>title : string

    task: Task;
>task : Task
  }
  Task: Task;
>Task : Task

};

type Res1 = GetKey<Schema, Schema['root']['task']>;  // "Task"
>Res1 : "Task"

type Res2 = GetKeyWithIf<Schema, Schema['root']['task']>;  // "Task"
>Res2 : "Task"

type Res3 = keyof GetObjWithIf<Schema, Schema['root']['task']>;  // "Task"
>Res3 : "Task"

// Repro from #44019

type KeysExtendedBy<T, U> = keyof { [K in keyof T as U extends T[K] ? K : never] : T[K] };
>KeysExtendedBy : keyof { [K in keyof T as U extends T[K] ? K : never]: T[K]; }

interface M {
    a: boolean;
>a : boolean

    b: number;
>b : number
}

function f(x: KeysExtendedBy<M, number>) {
>f : (x: KeysExtendedBy<M, number>) => "b"
>x : "b"

    return x;
>x : "b"
}

f("a");  // Error, should allow only "b"
>f("a") : "b"
>f : (x: "b") => "b"
>"a" : "a"

type NameMap = { 'a': 'x', 'b': 'y', 'c': 'z' };
>NameMap : { a: 'x'; b: 'y'; c: 'z'; }
>'a' : "x"
>'b' : "y"
>'c' : "z"

// Distributive, will be simplified

type TS0<T> = keyof { [P in keyof T as keyof Record<P, number>]: string };
>TS0 : keyof { [P in keyof T as P]: string; }

type TS1<T> = keyof { [P in keyof T as Extract<P, 'a' | 'b' | 'c'>]: string };
>TS1 : keyof { [P in keyof T as Extract<P, "a" | "b" | "c">]: string; }

type TS2<T> = keyof { [P in keyof T as P & ('a' | 'b' | 'c')]: string };
>TS2 : keyof { [P in keyof T as P & ("a" | "b" | "c")]: string; }

type TS3<T> = keyof { [P in keyof T as Exclude<P, 'a' | 'b' | 'c'>]: string };
>TS3 : keyof { [P in keyof T as Exclude<P, "a" | "b" | "c">]: string; }

type TS4<T> = keyof { [P in keyof T as NameMap[P & keyof NameMap]]: string };
>TS4 : keyof { [P in keyof T as NameMap[P & keyof NameMap]]: string; }

type TS5<T> = keyof { [P in keyof T & keyof NameMap as NameMap[P]]: string };
>TS5 : NameMap[keyof T & "a"] | NameMap[keyof T & "b"] | NameMap[keyof T & "c"]

type TS6<T, U, V> = keyof { [ K in keyof T as V & (K extends U ? K : never)]: string };
>TS6 : keyof { [K in keyof T as V & (K extends U ? K : never)]: string; }

// Non-distributive, won't be simplified

type TN0<T> = keyof { [P in keyof T as T[P] extends number ? P : never]: string };
>TN0 : keyof { [P in keyof T as T[P] extends number ? P : never]: string; }

type TN1<T> = keyof { [P in keyof T as number extends T[P] ? P : never]: string };
>TN1 : keyof { [P in keyof T as number extends T[P] ? P : never]: string; }

type TN2<T> = keyof { [P in keyof T as 'a' extends P ? 'x' : 'y']: string };
>TN2 : keyof { [P in keyof T as "a" extends P ? "x" : "y"]: string; }

type TN3<T> = keyof { [P in keyof T as Exclude<Exclude<Exclude<P, 'c'>, 'b'>, 'a'>]: string };
>TN3 : keyof { [P in keyof T as Exclude<Exclude<Exclude<P, "c">, "b">, "a">]: string; }

type TN4<T, U> = keyof { [K in keyof T as (K extends U ? T[K] : never) extends T[K] ? K : never]: string };
>TN4 : keyof { [K in keyof T as (K extends U ? T[K] : never) extends T[K] ? K : never]: string; }

type TN5<T, U> = keyof { [K in keyof T as keyof { [P in K as T[P] extends U ? K : never]: true }]: string };
>TN5 : keyof { [K in keyof T as keyof { [P in K as T[P] extends U ? K : never]: true; }]: string; }
>true : true