* Make never rest type top-like * Add higher-order test * properly support types which reduce to never Co-authored-by: Wesley Wigham <wwigham@gmail.com>
57 lines
1.8 KiB
TypeScript
57 lines
1.8 KiB
TypeScript
//// [genericRestTypes.ts]
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// Repro from #25793
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// Gets the parameters of a function type as a tuple
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// Removes the first element from a tuple
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type Tail<T extends any[]> = ((...args: T) => any) extends ((head: any, ...tail: infer U) => any) ? U : never;
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type MyFunctionType = (foo: number, bar: string) => boolean;
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type Explicit = (...args: Tail<Parameters<MyFunctionType>>) => ReturnType<MyFunctionType>; // (bar: string) => boolean
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type Bind1<T extends (head: any, ...tail: any[]) => any> = (...args: Tail<Parameters<T>>) => ReturnType<T>;
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type Generic = Bind1<MyFunctionType>; // (bar: string) => boolean
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function assignmentWithComplexRest<T extends any[]>() {
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const fn1: (x: string, ...rest: T) => void = (x, ..._) => x;
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const fn2: (...args: never) => void = fn1;
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}
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function assignmentWithComplexRest2<T extends any[]>() {
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const fn1: (cb: (x: string, ...rest: T) => void) => void = (cb) => {};
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const fn2: (cb: (...args: never) => void) => void = fn1;
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}
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function assignmentWithComplexRest3<T extends any[]>() {
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const fn1: (x: string, ...rest: T) => void = (x, ..._) => x;
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const fn2: (...args: {x: "a"} & {x: "b"}) => void = fn1;
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}
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//// [genericRestTypes.js]
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"use strict";
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// Repro from #25793
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function assignmentWithComplexRest() {
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var fn1 = function (x) {
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var _ = [];
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for (var _i = 1; _i < arguments.length; _i++) {
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_[_i - 1] = arguments[_i];
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}
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return x;
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};
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var fn2 = fn1;
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}
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function assignmentWithComplexRest2() {
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var fn1 = function (cb) { };
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var fn2 = fn1;
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}
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function assignmentWithComplexRest3() {
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var fn1 = function (x) {
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var _ = [];
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for (var _i = 1; _i < arguments.length; _i++) {
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_[_i - 1] = arguments[_i];
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}
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return x;
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};
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var fn2 = fn1;
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}
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