85 lines
2.1 KiB
XML
85 lines
2.1 KiB
XML
// @strict: true
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// From #4260
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class X<T> {
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f(t: T) {
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return { a: t };
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}
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}
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declare const x: X<void>;
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x.f() // no error because f expects void
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declare const xUnion: X<void | number>;
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xUnion.f(42) // no error because f accepts number
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xUnion.f() // no error because f accepts void
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declare const xAny: X<any>;
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xAny.f() // error, any still expects an argument
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declare const xUnknown: X<unknown>;
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xUnknown.f() // error, unknown still expects an argument
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declare const xNever: X<never>;
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xNever.f() // error, never still expects an argument
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// Promise has previously been updated to work without arguments, but to show this fixes the issue too.
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class MyPromise<X> {
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constructor(executor: (resolve: (value: X) => void) => void) {
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}
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}
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new MyPromise<void>(resolve => resolve()); // no error
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new MyPromise<void | number>(resolve => resolve()); // no error
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new MyPromise<any>(resolve => resolve()); // error, `any` arguments cannot be omitted
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new MyPromise<unknown>(resolve => resolve()); // error, `unknown` arguments cannot be omitted
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new MyPromise<never>(resolve => resolve()); // error, `never` arguments cannot be omitted
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// Multiple parameters
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function a(x: number, y: string, z: void): void {
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}
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a(4, "hello"); // ok
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a(4, "hello", void 0); // ok
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a(4); // not ok
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function b(x: number, y: string, z: void, what: number): void {
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}
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b(4, "hello", void 0, 2); // ok
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b(4, "hello"); // not ok
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b(4, "hello", void 0); // not ok
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b(4); // not ok
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function c(x: number | void, y: void, z: void | string | number): void {
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}
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c(3, void 0, void 0); // ok
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c(3, void 0); // ok
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c(3); // ok
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c(); // ok
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// Spread Parameters
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declare function call<TS extends unknown[]>(
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handler: (...args: TS) => unknown,
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...args: TS): void;
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call((x: number, y: number) => x + y) // error
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call((x: number, y: number) => x + y, 4, 2) // ok
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call((x: number, y: void) => x, 4, void 0) // ok
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call((x: number, y: void) => x, 4) // ok
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call((x: void, y: void) => 42) // ok
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call((x: number | void, y: number | void) => 42) // ok
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call((x: number | void, y: number | void) => 42, 4) // ok
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call((x: number | void, y: number | void) => 42, 4, 2) // ok
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