import bind = require('function-bind');

const string = String(Math.random());
const number = Math.random();
const boolean = Math.random() >= 0.5;

/**
 * The `expectType` function from https://www.npmjs.com/package/tsd,
 * except instead of returning `void`, it returns `T`.
 */
declare function expectType<T>(value: T): T;

// $ExpectType (thisArg: any, start?: number | undefined, end?: number | undefined) => any[]
const slice = expectType<(thisArg: any, start?: number, end?: number) => any[]>(
	bind.call(Function.call, Array.prototype.slice),
);

// $ExpectType (start?: number | undefined, end?: number | undefined) => any[]
const sliceBoundThis = expectType<(start?: number, end?: number) => any[]>(
	bind.call(Function.call, Array.prototype.slice, null),
);

// $ExpectType (end?: number | undefined) => any[]
const sliceBoundThisAndStart = expectType<(end?: number) => any[]>(
	bind.call(Function.call, Array.prototype.slice, ['a'], 1),
);

slice(['a']);

// $ExpectType (...args: string[]) => boolean
expectType<(...args: string[]) => boolean>(bind.call(Boolean, null, String(), '2', '3', '4', '5'));

// $ExpectType (...args: string[]) => boolean
expectType<(...args: string[]) => boolean>(bind.apply(Boolean, [null, '1', '2', '3', '4', '5']));

// Class compatibility:
class Foo {
	constructor(public string: string, public number: number) {}
}

// bind.call():
// $ExpectType new (string: string, number: number) => Foo
bind.call(Foo, null);
// Foo.bind(null);

// $ExpectType new (number: number) => Foo
bind.call(Foo, null, string);
// Foo.bind(null, string);

// $ExpectType new () => Foo
bind.call(Foo, null, string, number);
// Foo.bind(null, string, number);

// $ExpectType new () => Foo
bind.call(Foo, null, string, number, boolean);
// Foo.bind(null, string, number, boolean);

// $ExpectType new () => Foo
bind.call(Foo, null, string, number, boolean, undefined);
// Foo.bind(null, string, number, boolean, undefined);

// bind.apply():
// $ExpectType new (string: string, number: number) => Foo
bind.apply(Foo, [null]);
// Foo.bind(...[null]);

// $ExpectType new (number: number) => Foo
bind.apply(Foo, [null, string]);
// Foo.bind(...[null, string]);

// $ExpectType new () => Foo
bind.apply(Foo, [null, string, number]);
// Foo.bind(...[null, string, number]);

// $ExpectType new () => Foo
bind.apply(Foo, [null, string, number, boolean]);
// Foo.bind(...[null, string, number, boolean]);

// $ExpectType new () => Foo
bind.apply(Foo, [null, string, number, boolean, undefined]);
// Foo.bind(...[null, string, number, boolean, undefined]);