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import { Observable } from '../Observable';
import { OperatorFunction } from '../types';
/**
* Returns an Observable that emits whether or not every item of the source satisfies the condition specified.
*
* ## Example
* A simple example emitting true if all elements are less than 5, false otherwise
* ```ts
* import { of } from 'rxjs';
* import { every } from 'rxjs/operators';
*
* of(1, 2, 3, 4, 5, 6).pipe(
* every(x => x < 5),
* )
* .subscribe(x => console.log(x)); // -> false
* ```
*
* @param {function} predicate A function for determining if an item meets a specified condition.
* @param {any} [thisArg] Optional object to use for `this` in the callback.
* @return {Observable} An Observable of booleans that determines if all items of the source Observable meet the condition specified.
* @method every
* @owner Observable
*/
export declare function every<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any): OperatorFunction<T, boolean>;