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Merge pull request #30215 from Microsoft/higherOrderFunctionTypeInfer…
…ence Higher order function type inference
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tests/baselines/reference/genericFunctionInference1.errors.txt
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tests/cases/compiler/genericFunctionInference1.ts(83,14): error TS2345: Argument of type '<a>(value: { key: a; }) => a' is not assignable to parameter of type '(value: Data) => string'. | ||
Type 'number' is not assignable to type 'string'. | ||
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==== tests/cases/compiler/genericFunctionInference1.ts (1 errors) ==== | ||
declare function pipe<A extends any[], B>(ab: (...args: A) => B): (...args: A) => B; | ||
declare function pipe<A extends any[], B, C>(ab: (...args: A) => B, bc: (b: B) => C): (...args: A) => C; | ||
declare function pipe<A extends any[], B, C, D>(ab: (...args: A) => B, bc: (b: B) => C, cd: (c: C) => D): (...args: A) => D; | ||
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declare function list<T>(a: T): T[]; | ||
declare function box<V>(x: V): { value: V }; | ||
declare function foo<T extends { value: T }>(x: T): T; | ||
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const f00 = pipe(list); | ||
const f01 = pipe(list, box); | ||
const f02 = pipe(box, list); | ||
const f03 = pipe(x => list(x), box); | ||
const f04 = pipe(list, x => box(x)); | ||
const f05 = pipe(x => list(x), x => box(x)) | ||
const f06 = pipe(list, pipe(box)); | ||
const f07 = pipe(x => list(x), pipe(box)); | ||
const f08 = pipe(x => list(x), pipe(x => box(x))); | ||
const f09 = pipe(list, x => x.length); | ||
const f10 = pipe(foo); | ||
const f11 = pipe(foo, foo); | ||
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const g00: <T>(x: T) => T[] = pipe(list); | ||
const g01: <T>(x: T) => { value: T[] } = pipe(list, box); | ||
const g02: <T>(x: T) => { value: T }[] = pipe(box, list); | ||
const g03: <T>(x: T) => { value: T[] } = pipe(x => list(x), box); | ||
const g04: <T>(x: T) => { value: T[] } = pipe(list, x => box(x)); | ||
const g05: <T>(x: T) => { value: T[] } = pipe(x => list(x), x => box(x)) | ||
const g06: <T>(x: T) => { value: T[] } = pipe(list, pipe(box)); | ||
const g07: <T>(x: T) => { value: T[] } = pipe(x => list(x), pipe(box)); | ||
const g08: <T>(x: T) => { value: T[] } = pipe(x => list(x), pipe(x => box(x))); | ||
const g09: <T>(x: T) => number = pipe(list, x => x.length); | ||
const g10: <T extends { value: T }>(x: T) => T = pipe(foo); | ||
const g12: <T extends { value: T }>(x: T) => T = pipe(foo, foo); | ||
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declare function pipe2<A, B, C, D>(ab: (a: A) => B, cd: (c: C) => D): (a: [A, C]) => [B, D]; | ||
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const f20 = pipe2(list, box); | ||
const f21 = pipe2(box, list); | ||
const f22 = pipe2(list, list); | ||
const f23 = pipe2(box, box); | ||
const f24 = pipe2(f20, f20); | ||
const f25 = pipe2(foo, foo); | ||
const f26 = pipe2(f25, f25); | ||
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declare function pipe3<A, B, C>(ab: (a: A) => B, ac: (a: A) => C): (a: A) => [B, C]; | ||
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const f30 = pipe3(list, box); | ||
const f31 = pipe3(box, list); | ||
const f32 = pipe3(list, list); | ||
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declare function pipe4<A, B, C>(funcs: [(a: A) => B, (b: B) => C]): (a: A) => C; | ||
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const f40 = pipe4([list, box]); | ||
const f41 = pipe4([box, list]); | ||
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declare function pipe5<A, B>(f: (a: A) => B): { f: (a: A) => B }; | ||
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const f50 = pipe5(list); // No higher order inference | ||
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// #417 | ||
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function mirror<A, B>(f: (a: A) => B): (a: A) => B { return f; } | ||
var identityM = mirror(identity); | ||
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var x = 1; | ||
var y = identity(x); | ||
var z = identityM(x); | ||
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// #3038 | ||
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export function keyOf<a>(value: { key: a; }): a { | ||
return value.key; | ||
} | ||
export interface Data { | ||
key: number; | ||
value: Date; | ||
} | ||
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var data: Data[] = []; | ||
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declare function toKeys<a>(values: a[], toKey: (value: a) => string): string[]; | ||
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toKeys(data, keyOf); // Error | ||
~~~~~ | ||
!!! error TS2345: Argument of type '<a>(value: { key: a; }) => a' is not assignable to parameter of type '(value: Data) => string'. | ||
!!! error TS2345: Type 'number' is not assignable to type 'string'. | ||
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// #9366 | ||
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function flip<a, b, c>(f: (a: a, b: b) => c): (b: b, a: a) => c { | ||
return (b: b, a: a) => f(a, b); | ||
} | ||
function zip<T, U>(x: T, y: U): [T, U] { | ||
return [x, y]; | ||
} | ||
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var expected: <T, U>(y: U, x: T) => [T, U] = flip(zip); | ||
var actual = flip(zip); | ||
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// #9366 | ||
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const map = <T, U>(transform: (t: T) => U) => | ||
(arr: T[]) => arr.map(transform) | ||
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const identityStr = (t: string) => t; | ||
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const arr: string[] = map(identityStr)(['a']); | ||
const arr1: string[] = map(identity)(['a']); | ||
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// #9949 | ||
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function of2<a, b>(one: a, two: b): [a, b] { | ||
return [one, two]; | ||
} | ||
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const flipped = flip(of2); | ||
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// #29904.1 | ||
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type Component<P> = (props: P) => {}; | ||
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declare const myHoc1: <P>(C: Component<P>) => Component<P>; | ||
declare const myHoc2: <P>(C: Component<P>) => Component<P>; | ||
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declare const MyComponent1: Component<{ foo: 1 }>; | ||
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const enhance = pipe( | ||
myHoc1, | ||
myHoc2, | ||
); | ||
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const MyComponent2 = enhance(MyComponent1); | ||
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// #29904.2 | ||
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const fn20 = pipe((_a?: {}) => 1); | ||
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// #29904.3 | ||
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type Fn = (n: number) => number; | ||
const fn30: Fn = pipe( | ||
x => x + 1, | ||
x => x * 2, | ||
); | ||
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const promise = Promise.resolve(1); | ||
promise.then( | ||
pipe( | ||
x => x + 1, | ||
x => x * 2, | ||
), | ||
); | ||
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// #29904.4 | ||
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declare const getString: () => string; | ||
declare const orUndefined: (name: string) => string | undefined; | ||
declare const identity: <T>(value: T) => T; | ||
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const fn40 = pipe( | ||
getString, | ||
string => orUndefined(string), | ||
identity, | ||
); | ||
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// #29904.6 | ||
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declare const getArray: () => string[]; | ||
declare const first: <T>(ts: T[]) => T; | ||
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const fn60 = pipe( | ||
getArray, | ||
x => x, | ||
first, | ||
); | ||
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const fn61 = pipe( | ||
getArray, | ||
identity, | ||
first, | ||
); | ||
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const fn62 = pipe( | ||
getArray, | ||
x => x, | ||
x => first(x), | ||
); | ||
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