import { Function } from './Function.js';
import { Unique } from './Unique.js';

/**
 * Tuple of all possible overloads of a function. This is useful when you want to
 * destructure the parameters and return type of a function.
 *
 * For this to work, you must enable `strictFunctionTypes` in your `tsconfig.json`.
 * Otherwise, this type will infer the overloads incorrectly.
 *
 * @template T The type of the function.
 * @returns The union of all overloads.
 * @example
 * declare function foo(x: number): boolean
 * declare function foo(x: string): boolean
 * Overloads<typeof foo> // [(x: number) => boolean, (x: string) => boolean]
 */
type Overloads<T extends Function<any, any[]>> = T extends {
    (...p: infer P1): infer R1;
    (...p: infer P2): infer R2;
    (...p: infer P3): infer R3;
    (...p: infer P4): infer R4;
    (...p: infer P5): infer R5;
    (...p: infer P6): infer R6;
    (...p: infer P7): infer R7;
    (...p: infer P8): infer R8;
    (...p: infer P9): infer R9;
    (...p: infer P10): infer R10;
} ? Unique<[
    (...p: P1) => R1,
    (...p: P2) => R2,
    (...p: P3) => R3,
    (...p: P4) => R4,
    (...p: P5) => R5,
    (...p: P6) => R6,
    (...p: P7) => R7,
    (...p: P8) => R8,
    (...p: P9) => R9,
    (...p: P10) => R10
]> : never;

export type { Overloads };