import { OperatorFunction } from '../interfaces'; /** * Maps each source value (an object) to its specified nested property. * * Like {@link map}, but meant only for picking one of * the nested properties of every emitted object. * * * * Given a list of strings describing a path to an object property, retrieves * the value of a specified nested property from all values in the source * Observable. If a property can't be resolved, it will return `undefined` for * that value. * * @example Map every click to the tagName of the clicked target element * var clicks = Rx.Observable.fromEvent(document, 'click'); * var tagNames = clicks.pluck('target', 'tagName'); * tagNames.subscribe(x => console.log(x)); * * @see {@link map} * * @param {...string} properties The nested properties to pluck from each source * value (an object). * @return {Observable} A new Observable of property values from the source values. * @method pluck * @owner Observable */ export declare function pluck(...properties: string[]): OperatorFunction;