import { Observable } from '../Observable';
/**
 * Returns an Observable that emits whether or not every item of the source satisfies the condition specified.
 * @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
 * @returns {Observable} an Observable of booleans that determines if all items of the source Observable meet the condition specified.
 */
export declare function every<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any): Observable<boolean>;