This completes the work that started in PR #33069, and fixes #32835. There are probably two additional related changes that are needed to make this more complete: * Fix the code that composes the error message (see the first two `FIXME`s in `callWithSpread3.ts`). * Fix the code that checks the argument types (second two `FIXME`s). * There is also an error in `genericRestParameters1.ts` which changed but should not be an error in the first place. Added a `FIXME` there too. (Probably will work if the previous iterm is done.) In addition, `getEffectiveCallArguments` munges the arguments in case of a spread in the last argument which might be better to avoid. (I think that there are cases where it wouldn't work anyway, such as a spread of an array followed by a spread of an empty array.)
167 lines
5.4 KiB
TypeScript
167 lines
5.4 KiB
TypeScript
// @strict: true
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// @declaration: true
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declare let f1: (...x: [number, string, boolean]) => void;
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declare let f2: (x0: number, x1: string, x2: boolean) => void;
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f1 = f2;
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f2 = f1;
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declare const t3: [number, string, boolean];
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declare const t2: [string, boolean];
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declare const t1: [boolean];
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declare const t0: [];
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declare const ns: [number, string];
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declare const sn: [string, number];
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f1(42, "hello", true);
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f1(t3[0], t3[1], t3[2]);
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f1(...t3);
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f1(42, ...t2);
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f1(42, "hello", ...t1);
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f1(42, "hello", true, ...t0);
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f1(ns[0], ns[1], true);
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f1(...ns, true); // FIXME: Error, since ...ns is considered as string|number here
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f2(42, "hello", true);
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f2(t3[0], t3[1], t3[2]);
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f2(...t3);
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f2(42, ...t2);
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f2(42, "hello", ...t1);
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f2(42, "hello", true, ...t0);
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f2(ns[0], ns[1], true);
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f2(...ns, true); // FIXME: Error, since ...ns is considered as string|number here
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declare function f10<T extends unknown[]>(...args: T): T;
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const x10 = f10(42, "hello", true); // [number, string, boolean]
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const x11 = f10(42, "hello"); // [number, string]
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const x12 = f10(42); // [number]
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const x13 = f10(); // []
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const x14 = f10(...t3); // [number, string, boolean]
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const x15 = f10(42, ...t2); // [number, string, boolean]
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const x16 = f10(42, "hello", ...t1); // [number, string, boolean]
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const x17 = f10(42, "hello", true, ...t0); // [number, string, boolean]
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const x18 = f10(...ns, true); // (string | number | boolean)[]
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function g10<U extends string[], V extends [number, number]>(u: U, v: V) {
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let x1 = f10(...u); // U
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let x2 = f10(...v); // V
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let x3 = f10(1, ...u); // [number, ...string[]]
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let x4 = f10(...u, ...v); // (string | number)[]
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}
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declare function f11<T extends (string | number | boolean)[]>(...args: T): T;
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const z10 = f11(42, "hello", true); // [42, "hello", true]
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const z11 = f11(42, "hello"); // [42, "hello"]
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const z12 = f11(42); // [42]
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const z13 = f11(); // []
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const z14 = f11(...t3); // [number, string, boolean]
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const z15 = f11(42, ...t2); // [42, string, boolean]
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const z16 = f11(42, "hello", ...t1); // [42, "hello", boolean]
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const z17 = f11(42, "hello", true, ...t0); // [42, "hello", true]
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const z18 = f11(...ns, true); // (string | number | true)[]
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function g11<U extends string[], V extends [number, number]>(u: U, v: V) {
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let x1 = f11(...u); // U
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let x2 = f11(...v); // V
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let x3 = f11(1, ...u); // [1, ...string[]]
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let x4 = f11(...u, ...v); // (string | number)[]
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}
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function call<T extends unknown[], U>(f: (...args: T) => U, ...args: T) {
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return f(...args);
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}
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function callr<T extends unknown[], U>(args: T, f: (...args: T) => U) {
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return f(...args);
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}
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declare function f15(a: string, b: number): string | number;
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declare function f16<A, B>(a: A, b: B): A | B;
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let x20 = call((x, y) => x + y, 10, 20); // number
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let x21 = call((x, y) => x + y, 10, "hello"); // string
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let x22 = call(f15, "hello", 42); // string | number
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let x23 = call(f16, "hello", 42); // unknown
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let x24 = call<[string, number], string | number>(f16, "hello", 42); // string | number
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let x30 = callr(sn, (x, y) => x + y); // string
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let x31 = callr(sn, f15); // string | number
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let x32 = callr(sn, f16); // string | number
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function bind<T, U extends unknown[], V>(f: (x: T, ...rest: U) => V, x: T) {
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return (...rest: U) => f(x, ...rest);
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}
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declare const f20: (x: number, y: string, z: boolean) => string[];
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const f21 = bind(f20, 42); // (y: string, z: boolean) => string[]
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const f22 = bind(f21, "hello"); // (z: boolean) => string[]
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const f23 = bind(f22, true); // () => string[]
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f20(42, "hello", true);
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f21("hello", true);
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f22(true);
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f23();
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declare const g20: (x: number, y?: string, z?: boolean) => string[];
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const g21 = bind(g20, 42); // (y: string, z: boolean) => string[]
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const g22 = bind(g21, "hello"); // (z: boolean) => string[]
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const g23 = bind(g22, true); // () => string[]
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g20(42, "hello", true);
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g20(42, "hello");
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g20(42);
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g21("hello", true);
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g21("hello");
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g21();
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g22(true);
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g22();
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g23();
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declare function f30<T, U extends ((x: T) => any)[]>(x: T, ...args: U): U;
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const c30 = f30(42, x => "" + x, x => x + 1); // [(x: number) => string, (x: number) => number]
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type T01 = Parameters<(x: number, y: string, z: boolean) => void>;
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type T02 = Parameters<(...args: [number, string, boolean]) => void>;
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type T03 = ConstructorParameters<new (x: number, y: string, z: boolean) => void>;
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type T04 = ConstructorParameters<new (...args: [number, string, boolean]) => void>;
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type T05<T> = Parameters<(...args: T[]) => void>;
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type T06<T> = ConstructorParameters<new (...args: []) => void>;
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type T07<T extends any[]> = Parameters<(...args: T) => void>;
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type T08<T extends any[]> = ConstructorParameters<new (...args: T) => void>;
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type T09 = Parameters<Function>;
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type Record1 = {
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move: [number, 'left' | 'right'];
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jump: [number, 'up' | 'down'];
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stop: string;
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done: [];
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}
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type EventType<T> = {
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emit<K extends keyof T = keyof T>(e: K, ...payload: T[K] extends any[] ? T[K] : [T[K]]): void;
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}
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declare var events: EventType<Record1>;
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events.emit('move', 10, 'left');
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events.emit('jump', 20, 'up');
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events.emit('stop', 'Bye!');
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events.emit('done');
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// Repro from #25871
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declare var ff1: (... args: any[]) => void;
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declare var ff2: () => void;
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declare var ff3: (...args: []) => void;
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declare var ff4: (a: never) => void;
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ff1 = ff2;
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ff1 = ff3;
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ff1 = ff4; // Error
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