conditionalTypes1.types

=== tests/cases/conformance/types/conditional/conditionalTypes1.ts ===
type T00 = Exclude<"a" | "b" | "c" | "d", "a" | "c" | "f">;  // "b" | "d"
>T00 : "b" | "d"

type T01 = Extract<"a" | "b" | "c" | "d", "a" | "c" | "f">;  // "a" | "c"
>T01 : "a" | "c"

type T02 = Exclude<string | number | (() => void), Function>;  // string | number
>T02 : string | number

type T03 = Extract<string | number | (() => void), Function>;  // () => void
>T03 : () => void

type T04 = NonNullable<string | number | undefined>;  // string | number
>T04 : string | number

type T05 = NonNullable<(() => string) | string[] | null | undefined>;  // (() => string) | string[]
>T05 : (() => string) | string[]
>null : null

function f1<T>(x: T, y: NonNullable<T>) {
>f1 : <T>(x: T, y: NonNullable<T>) => void
>x : T
>y : NonNullable<T>

    x = y;
>x = y : NonNullable<T>
>x : T
>y : NonNullable<T>

    y = x;  // Error
>y = x : T
>y : NonNullable<T>
>x : T
}

function f2<T extends string | undefined>(x: T, y: NonNullable<T>) {
>f2 : <T extends string | undefined>(x: T, y: NonNullable<T>) => void
>x : T
>y : NonNullable<T>

    x = y;
>x = y : NonNullable<T>
>x : T
>y : NonNullable<T>

    y = x;  // Error
>y = x : T
>y : NonNullable<T>
>x : T

    let s1: string = x;  // Error
>s1 : string
>x : T

    let s2: string = y;
>s2 : string
>y : NonNullable<T>
}

function f3<T>(x: Partial<T>[keyof T], y: NonNullable<Partial<T>[keyof T]>) {
>f3 : <T>(x: Partial<T>[keyof T], y: NonNullable<Partial<T>[keyof T]>) => void
>x : Partial<T>[keyof T]
>y : NonNullable<Partial<T>[keyof T]>

    x = y;
>x = y : NonNullable<Partial<T>[keyof T]>
>x : Partial<T>[keyof T]
>y : NonNullable<Partial<T>[keyof T]>

    y = x;  // Error
>y = x : Partial<T>[keyof T]
>y : NonNullable<Partial<T>[keyof T]>
>x : Partial<T>[keyof T]
}

function f4<T extends { x: string | undefined }>(x: T["x"], y: NonNullable<T["x"]>) {
>f4 : <T extends { x: string | undefined; }>(x: T["x"], y: NonNullable<T["x"]>) => void
>x : string | undefined
>x : T["x"]
>y : NonNullable<T["x"]>

    x = y;
>x = y : NonNullable<T["x"]>
>x : T["x"]
>y : NonNullable<T["x"]>

    y = x;  // Error
>y = x : T["x"]
>y : NonNullable<T["x"]>
>x : T["x"]

    let s1: string = x;  // Error
>s1 : string
>x : T["x"]

    let s2: string = y;
>s2 : string
>y : NonNullable<T["x"]>
}

type Options = { k: "a", a: number } | { k: "b", b: string } | { k: "c", c: boolean };
>Options : Options
>k : "a"
>a : number
>k : "b"
>b : string
>k : "c"
>c : boolean

type T10 = Exclude<Options, { k: "a" | "b" }>;  // { k: "c", c: boolean }
>T10 : { k: "c"; c: boolean; }
>k : "a" | "b"

type T11 = Extract<Options, { k: "a" | "b" }>;  // { k: "a", a: number } | { k: "b", b: string }
>T11 : { k: "a"; a: number; } | { k: "b"; b: string; }
>k : "a" | "b"

type T12 = Exclude<Options, { k: "a" } | { k: "b" }>;  // { k: "c", c: boolean }
>T12 : { k: "c"; c: boolean; }
>k : "a"
>k : "b"

type T13 = Extract<Options, { k: "a" } | { k: "b" }>;  // { k: "a", a: number } | { k: "b", b: string }
>T13 : { k: "a"; a: number; } | { k: "b"; b: string; }
>k : "a"
>k : "b"

type T14 = Exclude<Options, { q: "a" }>;  // Options
>T14 : Options
>q : "a"

type T15 = Extract<Options, { q: "a" }>;  // never
>T15 : never
>q : "a"

declare function f5<T extends Options, K extends string>(p: K): Extract<T, { k: K }>;
>f5 : <T extends Options, K extends string>(p: K) => Extract<T, { k: K; }>
>p : K
>k : K

let x0 = f5("a");  // { k: "a", a: number }
>x0 : { k: "a"; a: number; }
>f5("a") : { k: "a"; a: number; }
>f5 : <T extends Options, K extends string>(p: K) => Extract<T, { k: K; }>
>"a" : "a"

type OptionsOfKind<K extends Options["k"]> = Extract<Options, { k: K }>;
>OptionsOfKind : Extract<{ k: "a"; a: number; }, { k: K; }> | Extract<{ k: "b"; b: string; }, { k: K; }> | Extract<{ k: "c"; c: boolean; }, { k: K; }>
>k : K

type T16 = OptionsOfKind<"a" | "b">;  // { k: "a", a: number } | { k: "b", b: string }
>T16 : { k: "a"; a: number; } | { k: "b"; b: string; }

type Select<T, K extends keyof T, V extends T[K]> = Extract<T, { [P in K]: V }>;
>Select : Extract<T, { [P in K]: V; }>

type T17 = Select<Options, "k", "a" | "b">;  // // { k: "a", a: number } | { k: "b", b: string }
>T17 : { k: "a"; a: number; } | { k: "b"; b: string; }

type TypeName<T> =
>TypeName : TypeName<T>

    T extends string ? "string" :
    T extends number ? "number" :
    T extends boolean ? "boolean" :
    T extends undefined ? "undefined" :
    T extends Function ? "function" :
    "object";

type T20 = TypeName<string | (() => void)>;  // "string" | "function"
>T20 : "string" | "function"

type T21 = TypeName<any>;  // "string" | "number" | "boolean" | "undefined" | "function" | "object"
>T21 : "string" | "number" | "boolean" | "undefined" | "object" | "function"

type T22 = TypeName<never>;  // never
>T22 : never

type T23 = TypeName<{}>;  // "object"
>T23 : "object"

type KnockoutObservable<T> = { object: T };
>KnockoutObservable : KnockoutObservable<T>
>object : T

type KnockoutObservableArray<T> = { array: T };
>KnockoutObservableArray : KnockoutObservableArray<T>
>array : T

type KnockedOut<T> = T extends any[] ? KnockoutObservableArray<T[number]> : KnockoutObservable<T>;
>KnockedOut : KnockedOut<T>

type KnockedOutObj<T> = {
>KnockedOutObj : KnockedOutObj<T>

    [P in keyof T]: KnockedOut<T[P]>;
}

interface Item {
    id: number;
>id : number

    name: string;
>name : string

    subitems: string[];
>subitems : string[]
}

type KOItem = KnockedOutObj<Item>;
>KOItem : KnockedOutObj<Item>

interface Part {
    id: number;
>id : number

    name: string;
>name : string

    subparts: Part[];
>subparts : Part[]

    updatePart(newName: string): void;
>updatePart : (newName: string) => void
>newName : string
}

type FunctionPropertyNames<T> = { [K in keyof T]: T[K] extends Function ? K : never }[keyof T];
>FunctionPropertyNames : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]

type FunctionProperties<T> = Pick<T, FunctionPropertyNames<T>>;
>FunctionProperties : Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>

type NonFunctionPropertyNames<T> = { [K in keyof T]: T[K] extends Function ? never : K }[keyof T];
>NonFunctionPropertyNames : { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]

type NonFunctionProperties<T> = Pick<T, NonFunctionPropertyNames<T>>;
>NonFunctionProperties : Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>

type T30 = FunctionProperties<Part>;
>T30 : Pick<Part, "updatePart">

type T31 = NonFunctionProperties<Part>;
>T31 : Pick<Part, "id" | "name" | "subparts">

function f7<T>(x: T, y: FunctionProperties<T>, z: NonFunctionProperties<T>) {
>f7 : <T>(x: T, y: Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>, z: Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>) => void
>x : T
>y : Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>
>z : Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>

    x = y;  // Error
>x = y : Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>
>x : T
>y : Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>

    x = z;  // Error
>x = z : Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>
>x : T
>z : Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>

    y = x;
>y = x : T
>y : Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>
>x : T

    y = z;  // Error
>y = z : Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>
>y : Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>
>z : Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>

    z = x;
>z = x : T
>z : Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>
>x : T

    z = y;  // Error
>z = y : Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>
>z : Pick<T, { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]>
>y : Pick<T, { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]>
}

function f8<T>(x: keyof T, y: FunctionPropertyNames<T>, z: NonFunctionPropertyNames<T>) {
>f8 : <T>(x: keyof T, y: { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T], z: { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]) => void
>x : keyof T
>y : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]
>z : { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]

    x = y;
>x = y : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]
>x : keyof T
>y : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]

    x = z;
>x = z : { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]
>x : keyof T
>z : { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]

    y = x;  // Error
>y = x : keyof T
>y : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]
>x : keyof T

    y = z;  // Error
>y = z : { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]
>y : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]
>z : { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]

    z = x;  // Error
>z = x : keyof T
>z : { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]
>x : keyof T

    z = y;  // Error
>z = y : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]
>z : { [K in keyof T]: T[K] extends Function ? never : K; }[keyof T]
>y : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]
}

type DeepReadonly<T> =
>DeepReadonly : DeepReadonly<T>

    T extends any[] ? DeepReadonlyArray<T[number]> :
    T extends object ? DeepReadonlyObject<T> :
    T;

interface DeepReadonlyArray<T> extends ReadonlyArray<DeepReadonly<T>> {}

type DeepReadonlyObject<T> = {
>DeepReadonlyObject : DeepReadonlyObject<T>

    readonly [P in NonFunctionPropertyNames<T>]: DeepReadonly<T[P]>;
};

function f10(part: DeepReadonly<Part>) {
>f10 : (part: DeepReadonlyObject<Part>) => void
>part : DeepReadonlyObject<Part>

    let name: string = part.name;
>name : string
>part.name : string
>part : DeepReadonlyObject<Part>
>name : string

    let id: number = part.subparts[0].id;
>id : number
>part.subparts[0].id : number
>part.subparts[0] : DeepReadonlyObject<Part>
>part.subparts : DeepReadonlyArray<Part>
>part : DeepReadonlyObject<Part>
>subparts : DeepReadonlyArray<Part>
>0 : 0
>id : number

    part.id = part.id;  // Error
>part.id = part.id : number
>part.id : any
>part : DeepReadonlyObject<Part>
>id : any
>part.id : number
>part : DeepReadonlyObject<Part>
>id : number

    part.subparts[0] = part.subparts[0];  // Error
>part.subparts[0] = part.subparts[0] : DeepReadonlyObject<Part>
>part.subparts[0] : DeepReadonlyObject<Part>
>part.subparts : DeepReadonlyArray<Part>
>part : DeepReadonlyObject<Part>
>subparts : DeepReadonlyArray<Part>
>0 : 0
>part.subparts[0] : DeepReadonlyObject<Part>
>part.subparts : DeepReadonlyArray<Part>
>part : DeepReadonlyObject<Part>
>subparts : DeepReadonlyArray<Part>
>0 : 0

    part.subparts[0].id = part.subparts[0].id;  // Error
>part.subparts[0].id = part.subparts[0].id : number
>part.subparts[0].id : any
>part.subparts[0] : DeepReadonlyObject<Part>
>part.subparts : DeepReadonlyArray<Part>
>part : DeepReadonlyObject<Part>
>subparts : DeepReadonlyArray<Part>
>0 : 0
>id : any
>part.subparts[0].id : number
>part.subparts[0] : DeepReadonlyObject<Part>
>part.subparts : DeepReadonlyArray<Part>
>part : DeepReadonlyObject<Part>
>subparts : DeepReadonlyArray<Part>
>0 : 0
>id : number

    part.updatePart("hello");  // Error
>part.updatePart("hello") : any
>part.updatePart : any
>part : DeepReadonlyObject<Part>
>updatePart : any
>"hello" : "hello"
}

type ZeroOf<T extends number | string | boolean> = T extends number ? 0 : T extends string ? "" : false;
>ZeroOf : ZeroOf<T>
>false : false

function zeroOf<T extends number | string | boolean>(value: T) {
>zeroOf : <T extends string | number | boolean>(value: T) => ZeroOf<T>
>value : T

    return <ZeroOf<T>>(typeof value === "number" ? 0 : typeof value === "string" ? "" : false);
><ZeroOf<T>>(typeof value === "number" ? 0 : typeof value === "string" ? "" : false) : ZeroOf<T>
>(typeof value === "number" ? 0 : typeof value === "string" ? "" : false) : false | "" | 0
>typeof value === "number" ? 0 : typeof value === "string" ? "" : false : false | "" | 0
>typeof value === "number" : boolean
>typeof value : "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function"
>value : T
>"number" : "number"
>0 : 0
>typeof value === "string" ? "" : false : false | ""
>typeof value === "string" : boolean
>typeof value : "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function"
>value : T
>"string" : "string"
>"" : ""
>false : false
}

function f20<T extends string>(n: number, b: boolean, x: number | boolean, y: T) {
>f20 : <T extends string>(n: number, b: boolean, x: number | boolean, y: T) => void
>n : number
>b : boolean
>x : number | boolean
>y : T

    zeroOf(5);  // 0
>zeroOf(5) : 0
>zeroOf : <T extends string | number | boolean>(value: T) => ZeroOf<T>
>5 : 5

    zeroOf("hello");  // ""
>zeroOf("hello") : ""
>zeroOf : <T extends string | number | boolean>(value: T) => ZeroOf<T>
>"hello" : "hello"

    zeroOf(true);  // false
>zeroOf(true) : false
>zeroOf : <T extends string | number | boolean>(value: T) => ZeroOf<T>
>true : true

    zeroOf(n);  // 0
>zeroOf(n) : 0
>zeroOf : <T extends string | number | boolean>(value: T) => ZeroOf<T>
>n : number

    zeroOf(b);  // False
>zeroOf(b) : false
>zeroOf : <T extends string | number | boolean>(value: T) => ZeroOf<T>
>b : boolean

    zeroOf(x);  // 0 | false
>zeroOf(x) : false | 0
>zeroOf : <T extends string | number | boolean>(value: T) => ZeroOf<T>
>x : number | boolean

    zeroOf(y);  // ZeroOf<T>
>zeroOf(y) : ZeroOf<T>
>zeroOf : <T extends string | number | boolean>(value: T) => ZeroOf<T>
>y : T
}

function f21<T extends number | string>(x: T, y: ZeroOf<T>) {
>f21 : <T extends string | number>(x: T, y: ZeroOf<T>) => void
>x : T
>y : ZeroOf<T>

    let z1: number | string = y;
>z1 : string | number
>y : ZeroOf<T>

    let z2: 0 | "" = y;
>z2 : "" | 0
>y : ZeroOf<T>

    x = y;  // Error
>x = y : ZeroOf<T>
>x : T
>y : ZeroOf<T>

    y = x;  // Error
>y = x : T
>y : ZeroOf<T>
>x : T
}

type T35<T extends { a: string, b: number }> = T[];
>T35 : T[]
>a : string
>b : number

type T36<T> = T extends { a: string } ? T extends { b: number } ? T35<T> : never : never;
>T36 : T36<T>
>a : string
>b : number

type T37<T> = T extends { b: number } ? T extends { a: string } ? T35<T> : never : never;
>T37 : T37<T>
>b : number
>a : string

type T38<T> = [T] extends [{ a: string }] ? [T] extends [{ b: number }] ? T35<T> : never : never;
>T38 : T38<T>
>a : string
>b : number

type Extends<T, U> = T extends U ? true : false;
>Extends : Extends<T, U>
>true : true
>false : false

type If<C extends boolean, T, F> = C extends true ? T : F;
>If : If<C, T, F>
>true : true

type Not<C extends boolean> = If<C, false, true>;
>Not : If<C, false, true>
>false : false
>true : true

type And<A extends boolean, B extends boolean> = If<A, B, false>;
>And : If<A, B, false>
>false : false

type Or<A extends boolean, B extends boolean> = If<A, true, B>;
>Or : If<A, true, B>
>true : true

type IsString<T> = Extends<T, string>;
>IsString : Extends<T, string>

type Q1 = IsString<number>;  // false
>Q1 : false

type Q2 = IsString<"abc">;  // true
>Q2 : true

type Q3 = IsString<any>;  // boolean
>Q3 : boolean

type Q4 = IsString<never>;  // never
>Q4 : never

type N1 = Not<false>;  // true
>N1 : true
>false : false

type N2 = Not<true>;  // false
>N2 : false
>true : true

type N3 = Not<boolean>;  // boolean
>N3 : boolean

type A1 = And<false, false>;  // false
>A1 : false
>false : false
>false : false

type A2 = And<false, true>;  // false
>A2 : false
>false : false
>true : true

type A3 = And<true, false>;  // false
>A3 : false
>true : true
>false : false

type A4 = And<true, true>;  // true
>A4 : true
>true : true
>true : true

type A5 = And<boolean, false>;  // false
>A5 : false
>false : false

type A6 = And<false, boolean>;  // false
>A6 : false
>false : false

type A7 = And<boolean, true>;  // boolean
>A7 : boolean
>true : true

type A8 = And<true, boolean>;  // boolean
>A8 : boolean
>true : true

type A9 = And<boolean, boolean>;  // boolean
>A9 : boolean

type O1 = Or<false, false>;  // false
>O1 : false
>false : false
>false : false

type O2 = Or<false, true>;  // true
>O2 : true
>false : false
>true : true

type O3 = Or<true, false>;  // true
>O3 : true
>true : true
>false : false

type O4 = Or<true, true>;  // true
>O4 : true
>true : true
>true : true

type O5 = Or<boolean, false>;  // boolean
>O5 : boolean
>false : false

type O6 = Or<false, boolean>;  // boolean
>O6 : boolean
>false : false

type O7 = Or<boolean, true>;  // true
>O7 : true
>true : true

type O8 = Or<true, boolean>;  // true
>O8 : true
>true : true

type O9 = Or<boolean, boolean>;  // boolean
>O9 : boolean

type T40 = never extends never ? true : false;  // true
>T40 : true
>true : true
>false : false

type T41 = number extends never ? true : false;  // false
>T41 : false
>true : true
>false : false

type T42 = never extends number ? true : false;  // true
>T42 : true
>true : true
>false : false

type IsNever<T> = [T] extends [never] ? true : false;
>IsNever : IsNever<T>
>true : true
>false : false

type T50 = IsNever<never>;  // true
>T50 : true

type T51 = IsNever<number>;  // false
>T51 : false

type T52 = IsNever<any>;  // false
>T52 : false

function f22<T>(x: T extends (infer U)[] ? U[] : never) {
>f22 : <T>(x: T extends (infer U)[] ? U[] : never) => void
>x : T extends (infer U)[] ? U[] : never

    let e = x[0];  // {}
>e : unknown
>x[0] : unknown
>x : T extends (infer U)[] ? U[] : never
>0 : 0
}

function f23<T extends string[]>(x: T extends (infer U)[] ? U[] : never) {
>f23 : <T extends string[]>(x: T extends (infer U)[] ? U[] : never) => void
>x : T extends (infer U)[] ? U[] : never

    let e = x[0];  // string
>e : string
>x[0] : string
>x : T extends (infer U)[] ? U[] : never
>0 : 0
}

// Repros from #21664

type Eq<T, U> = T extends U ? U extends T ? true : false : false;
>Eq : Eq<T, U>
>true : true
>false : false
>false : false

type T60 = Eq<true, true>;  // true
>T60 : true
>true : true
>true : true

type T61 = Eq<true, false>;  // false
>T61 : false
>true : true
>false : false

type T62 = Eq<false, true>;  // false
>T62 : false
>false : false
>true : true

type T63 = Eq<false, false>;  // true
>T63 : true
>false : false
>false : false

type Eq1<T, U> = Eq<T, U> extends false ? false : true;
>Eq1 : Eq1<T, U>
>false : false
>false : false
>true : true

type T70 = Eq1<true, true>;  // true
>T70 : true
>true : true
>true : true

type T71 = Eq1<true, false>;  // false
>T71 : false
>true : true
>false : false

type T72 = Eq1<false, true>;  // false
>T72 : false
>false : false
>true : true

type T73 = Eq1<false, false>;  // true
>T73 : true
>false : false
>false : false

type Eq2<T, U> = Eq<T, U> extends true ? true : false;
>Eq2 : Eq2<T, U>
>true : true
>true : true
>false : false

type T80 = Eq2<true, true>;  // true
>T80 : true
>true : true
>true : true

type T81 = Eq2<true, false>;  // false
>T81 : false
>true : true
>false : false

type T82 = Eq2<false, true>;  // false
>T82 : false
>false : false
>true : true

type T83 = Eq2<false, false>;  // true
>T83 : true
>false : false
>false : false

// Repro from #21756

type Foo<T> = T extends string ? boolean : number;
>Foo : Foo<T>

type Bar<T> = T extends string ? boolean : number;
>Bar : Bar<T>

const convert = <U>(value: Foo<U>): Bar<U> => value;
>convert : <U>(value: Foo<U>) => Bar<U>
><U>(value: Foo<U>): Bar<U> => value : <U>(value: Foo<U>) => Bar<U>
>value : Foo<U>
>value : Foo<U>

type Baz<T> = Foo<T>;
>Baz : Foo<T>

const convert2 = <T>(value: Foo<T>): Baz<T> => value;
>convert2 : <T>(value: Foo<T>) => Foo<T>
><T>(value: Foo<T>): Baz<T> => value : <T>(value: Foo<T>) => Foo<T>
>value : Foo<T>
>value : Foo<T>

function f31<T>() {
>f31 : <T>() => void

    type T1 = T extends string ? boolean : number;
>T1 : T extends string ? boolean : number

    type T2 = T extends string ? boolean : number;
>T2 : T extends string ? boolean : number

    var x: T1;
>x : T extends string ? boolean : number

    var x: T2;
>x : T extends string ? boolean : number
}

function f32<T, U>() {
>f32 : <T, U>() => void

    type T1 = T & U extends string ? boolean : number;
>T1 : T & U extends string ? boolean : number

    type T2 = Foo<T & U>;
>T2 : Foo<T & U>

    var z: T1;
>z : T & U extends string ? boolean : number

    var z: T2;  // Error, T2 is distributive, T1 isn't
>z : T & U extends string ? boolean : number
}

function f33<T, U>() {
>f33 : <T, U>() => void

    type T1 = Foo<T & U>;
>T1 : Foo<T & U>

    type T2 = Bar<T & U>;
>T2 : Bar<T & U>

    var z: T1;
>z : Foo<T & U>

    var z: T2;
>z : Foo<T & U>
}

// Repro from #21823

type T90<T> = T extends 0 ? 0 : () => 0;
>T90 : T90<T>

type T91<T> = T extends 0 ? 0 : () => 0;
>T91 : T91<T>

const f40 = <U>(a: T90<U>): T91<U> => a;
>f40 : <U>(a: T90<U>) => T91<U>
><U>(a: T90<U>): T91<U> => a : <U>(a: T90<U>) => T91<U>
>a : T90<U>
>a : T90<U>

const f41 = <U>(a: T91<U>): T90<U> => a;
>f41 : <U>(a: T91<U>) => T90<U>
><U>(a: T91<U>): T90<U> => a : <U>(a: T91<U>) => T90<U>
>a : T91<U>
>a : T91<U>

type T92<T> = T extends () => 0 ? () => 1 : () => 2;
>T92 : T92<T>

type T93<T> = T extends () => 0 ? () => 1 : () => 2;
>T93 : T93<T>

const f42 = <U>(a: T92<U>): T93<U> => a;
>f42 : <U>(a: T92<U>) => T93<U>
><U>(a: T92<U>): T93<U> => a : <U>(a: T92<U>) => T93<U>
>a : T92<U>
>a : T92<U>

const f43 = <U>(a: T93<U>): T92<U> => a;
>f43 : <U>(a: T93<U>) => T92<U>
><U>(a: T93<U>): T92<U> => a : <U>(a: T93<U>) => T92<U>
>a : T93<U>
>a : T93<U>

type T94<T> = T extends string ? true : 42;
>T94 : T94<T>
>true : true

type T95<T> = T extends string ? boolean : number;
>T95 : T95<T>

const f44 = <U>(value: T94<U>): T95<U> => value;
>f44 : <U>(value: T94<U>) => T95<U>
><U>(value: T94<U>): T95<U> => value : <U>(value: T94<U>) => T95<U>
>value : T94<U>
>value : T94<U>

const f45 = <U>(value: T95<U>): T94<U> => value;  // Error
>f45 : <U>(value: T95<U>) => T94<U>
><U>(value: T95<U>): T94<U> => value : <U>(value: T95<U>) => T94<U>
>value : T95<U>
>value : T95<U>

// Repro from #21863

function f50() {
>f50 : () => void

    type Eq<T, U> = T extends U ? U extends T ? true : false : false;
>Eq : T extends U ? U extends T ? true : false : false
>true : true
>false : false
>false : false

    type If<S, T, U> = S extends false ? U : T;
>If : S extends false ? U : T
>false : false

    type Omit<T extends object> = { [P in keyof T]: If<Eq<T[P], never>, never, P>; }[keyof T];
>Omit : { [P in keyof T]: (T[P] extends never ? never : false) extends false ? P : never; }[keyof T]

    type Omit2<T extends object, U = never> = { [P in keyof T]: If<Eq<T[P], U>, never, P>; }[keyof T];
>Omit2 : { [P in keyof T]: (T[P] extends U ? U extends T[P] ? true : false : false) extends false ? P : never; }[keyof T]

    type A = Omit<{ a: void; b: never; }>;  // 'a'
>A : "a"
>a : void
>b : never

    type B = Omit2<{ a: void; b: never; }>;  // 'a'
>B : "a"
>a : void
>b : never
}

// Repro from #21862

type OldDiff<T extends keyof any, U extends keyof any> = (
>OldDiff : ({ [P in T]: P; } & { [P in U]: never; } & { [x: string]: never; })[T]

    & { [P in T]: P; }
    & { [P in U]: never; }
    & { [x: string]: never; }
>x : string

)[T];
type NewDiff<T, U> = T extends U ? never : T;
>NewDiff : NewDiff<T, U>

interface A {
    a: 'a';
>a : "a"
}
interface B1 extends A {
    b: 'b';
>b : "b"

    c: OldDiff<keyof this, keyof A>;
>c : ({ [P in keyof this]: P; } & { a: never; } & { [x: string]: never; })[keyof this]
}
interface B2 extends A {
    b: 'b';
>b : "b"

    c: NewDiff<keyof this, keyof A>;
>c : NewDiff<keyof this, "a">
}
type c1 = B1['c']; // 'c' | 'b'
>c1 : "b" | "c"

type c2 = B2['c']; // 'c' | 'b'
>c2 : "b" | "c"

// Repro from #21929

type NonFooKeys1<T extends object> = OldDiff<keyof T, 'foo'>;
>NonFooKeys1 : ({ [P in keyof T]: P; } & { foo: never; } & { [x: string]: never; })[keyof T]

type NonFooKeys2<T extends object> = Exclude<keyof T, 'foo'>;
>NonFooKeys2 : Exclude<keyof T, "foo">

type Test1 = NonFooKeys1<{foo: 1, bar: 2, baz: 3}>;  // "bar" | "baz"
>Test1 : "bar" | "baz"
>foo : 1
>bar : 2
>baz : 3

type Test2 = NonFooKeys2<{foo: 1, bar: 2, baz: 3}>;  // "bar" | "baz"
>Test2 : "bar" | "baz"
>foo : 1
>bar : 2
>baz : 3

// Repro from #21729

interface Foo2 { foo: string; }
>foo : string

interface Bar2 { bar: string; }
>bar : string

type FooBar = Foo2 | Bar2;
>FooBar : FooBar

declare interface ExtractFooBar<FB extends FooBar> { }

type Extracted<Struct> = {
>Extracted : Extracted<Struct>

    [K in keyof Struct]: Struct[K] extends FooBar ? ExtractFooBar<Struct[K]> : Struct[K];
}

// Repro from #22985

type RecursivePartial<T> = {
>RecursivePartial : RecursivePartial<T>

  [P in keyof T]?: T[P] extends Array<any> ? {[index: number]: RecursivePartial<T[P][0]>} :
>index : number

    T[P] extends object ? RecursivePartial<T[P]> : T[P];
};

declare function assign<T>(o: T, a: RecursivePartial<T>): void;
>assign : <T>(o: T, a: RecursivePartial<T>) => void
>o : T
>a : RecursivePartial<T>

var a = {o: 1, b: 2, c: [{a: 1, c: '213'}]}
>a : { o: number; b: number; c: { a: number; c: string; }[]; }
>{o: 1, b: 2, c: [{a: 1, c: '213'}]} : { o: number; b: number; c: { a: number; c: string; }[]; }
>o : number
>1 : 1
>b : number
>2 : 2
>c : { a: number; c: string; }[]
>[{a: 1, c: '213'}] : { a: number; c: string; }[]
>{a: 1, c: '213'} : { a: number; c: string; }
>a : number
>1 : 1
>c : string
>'213' : "213"

assign(a, {o: 2, c: {0: {a: 2, c: '213123'}}})
>assign(a, {o: 2, c: {0: {a: 2, c: '213123'}}}) : void
>assign : <T>(o: T, a: RecursivePartial<T>) => void
>a : { o: number; b: number; c: { a: number; c: string; }[]; }
>{o: 2, c: {0: {a: 2, c: '213123'}}} : { o: number; c: { 0: { a: number; c: string; }; }; }
>o : number
>2 : 2
>c : { 0: { a: number; c: string; }; }
>{0: {a: 2, c: '213123'}} : { 0: { a: number; c: string; }; }
>0 : { a: number; c: string; }
>{a: 2, c: '213123'} : { a: number; c: string; }
>a : number
>2 : 2
>c : string
>'213123' : "213123"

// Repros from #23843

type Weird1 = (<U extends boolean>(a: U) => never) extends 
>Weird1 : never
>a : U

    (<U extends true>(a: U) => never) ? never : never;
>true : true
>a : U

type Weird2 = (<U extends boolean>(a: U) => U) extends 
>Weird2 : boolean
>a : U

    (<U extends true>(a: U) => infer T) ? T : never;
>true : true
>a : U