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import { OperatorFunction } from '../types'; /** * Emits the given constant value on the output Observable every time the source * Observable emits a value. * * <span class="informal">Like {@link map}, but it maps every source value to * the same output value every time.</span> * *  * * Takes a constant `value` as argument, and emits that whenever the source * Observable emits a value. In other words, ignores the actual source value, * and simply uses the emission moment to know when to emit the given `value`. * * ## Example * Map every click to the string 'Hi' * ```ts * import { fromEvent } from 'rxjs'; * import { mapTo } from 'rxjs/operators'; * * const clicks = fromEvent(document, 'click'); * const greetings = clicks.pipe(mapTo('Hi')); * greetings.subscribe(x => console.log(x)); * ``` * * @see {@link map} * * @param {any} value The value to map each source value to. * @return {Observable} An Observable that emits the given `value` every time * the source Observable emits something. * @method mapTo * @owner Observable */ export declare function mapTo<T, R>(value: R): OperatorFunction<T, R>;
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