import { Observable } from '../Observable';
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import { Falsy, OperatorFunction } from '../types';
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import { operate } from '../util/lift';
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import { createOperatorSubscriber } from './OperatorSubscriber';
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export function every<T>(predicate: BooleanConstructor): OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>;
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/** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
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export function every<T>(
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predicate: BooleanConstructor,
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thisArg: any
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): OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>;
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/** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
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export function every<T, A>(
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predicate: (this: A, value: T, index: number, source: Observable<T>) => boolean,
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thisArg: A
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): OperatorFunction<T, boolean>;
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export function every<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean): OperatorFunction<T, boolean>;
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/**
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* Returns an Observable that emits whether or not every item of the source satisfies the condition specified.
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*
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* <span class="informal">If all values pass predicate before the source completes, emits true before completion,
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* otherwise emit false, then complete.</span>
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*
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* 
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*
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* ## Example
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*
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* A simple example emitting true if all elements are less than 5, false otherwise
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*
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* ```ts
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* import { of, every } from 'rxjs';
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*
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* of(1, 2, 3, 4, 5, 6)
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* .pipe(every(x => x < 5))
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* .subscribe(x => console.log(x)); // -> false
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* ```
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*
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* @param {function} predicate A function for determining if an item meets a specified condition.
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* @param {any} [thisArg] Optional object to use for `this` in the callback.
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* @return A function that returns an Observable of booleans that determines if
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* all items of the source Observable meet the condition specified.
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*/
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export function every<T>(
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predicate: (value: T, index: number, source: Observable<T>) => boolean,
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thisArg?: any
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): OperatorFunction<T, boolean> {
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return operate((source, subscriber) => {
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let index = 0;
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source.subscribe(
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createOperatorSubscriber(
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subscriber,
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(value) => {
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if (!predicate.call(thisArg, value, index++, source)) {
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subscriber.next(false);
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subscriber.complete();
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}
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},
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() => {
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subscriber.next(true);
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subscriber.complete();
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}
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)
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);
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});
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}
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