import PCancelable from 'p-cancelable';

export type Value<T> = T | PromiseLike<T>;
export type CancelablePromise<T> = PCancelable<T>;

export class FilterError extends Error {}

export interface Options<T> {
	/**
	Number of promises from `input` that have to be fulfilled until the returned promise is fulfilled. Minimum: `1`.
	*/
	readonly count: number;

	/**
	Used to filter out values that don't satisfy a condition.

	@param value - The value resolved by the promise.
	*/
	readonly filter?: (value: T) => boolean;
}

/**
Wait for a specified number of promises to be fulfilled.

@param values - An `Iterable` collection of promises/values to wait for. If you pass in cancelable promises, specifically promises with a `.cancel()` method, that method will be called for the promises that are still unfulfilled when the returned `Promise` is either fulfilled or rejected.
@returns A [cancelable `Promise`](https://github.com/sindresorhus/p-cancelable) that is fulfilled when `count` promises from `input` are fulfilled. The fulfilled value is an `Array` of the values from the `input` promises in the order they were fulfilled. If it becomes impossible to satisfy `count`, for example, too many promises rejected, it will reject with an [`AggregateError`](https://github.com/sindresorhus/aggregate-error) error.

@example
```
import got from 'got';
import pSome from 'p-some';

const input = [
	got.head('github.com').then(() => 'github'),
	got.head('google.com').then(() => 'google'),
	got.head('twitter.com').then(() => 'twitter'),
	got.head('medium.com').then(() => 'medium')
];

const [first, second] = await pSome(input, {count: 2});

console.log(first, second);
//=> 'google twitter'
```
*/
export default function pSome<T>(
	values: Iterable<Value<T>>,
	options: Options<T>
): CancelablePromise<T[]>;

export {default as AggregateError} from 'aggregate-error';