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import { Falsy, MonoTypeOperatorFunction, OperatorFunction } from '../types';
import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
export function skipWhile<T>(predicate: BooleanConstructor): OperatorFunction<T, Extract<T, Falsy> extends never ? never : T>;
export function skipWhile<T>(predicate: (value: T, index: number) => true): OperatorFunction<T, never>;
export function skipWhile<T>(predicate: (value: T, index: number) => boolean): MonoTypeOperatorFunction<T>;
/**
* Returns an Observable that skips all items emitted by the source Observable as long as a specified condition holds
* true, but emits all further source items as soon as the condition becomes false.
*
* 
*
* Skips all the notifications with a truthy predicate. It will not skip the notifications when the predicate is falsy.
* It can also be skipped using index. Once the predicate is true, it will not be called again.
*
* ## Example
*
* Skip some super heroes
*
* ```ts
* import { from, skipWhile } from 'rxjs';
*
* const source = from(['Green Arrow', 'SuperMan', 'Flash', 'SuperGirl', 'Black Canary'])
* // Skip the heroes until SuperGirl
* const example = source.pipe(skipWhile(hero => hero !== 'SuperGirl'));
* // output: SuperGirl, Black Canary
* example.subscribe(femaleHero => console.log(femaleHero));
* ```
*
* Skip values from the array until index 5
*
* ```ts
* import { from, skipWhile } from 'rxjs';
*
* const source = from([1, 2, 3, 4, 5, 6, 7, 9, 10]);
* const example = source.pipe(skipWhile((_, i) => i !== 5));
* // output: 6, 7, 9, 10
* example.subscribe(value => console.log(value));
* ```
*
* @see {@link last}
* @see {@link skip}
* @see {@link skipUntil}
* @see {@link skipLast}
*
* @param {Function} predicate - A function to test each item emitted from the source Observable.
* @return A function that returns an Observable that begins emitting items
* emitted by the source Observable when the specified predicate becomes false.
*/
export function skipWhile<T>(predicate: (value: T, index: number) => boolean): MonoTypeOperatorFunction<T> {
return operate((source, subscriber) => {
let taking = false;
let index = 0;
source.subscribe(
createOperatorSubscriber(subscriber, (value) => (taking || (taking = !predicate(value, index++))) && subscriber.next(value))
);
});
}