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- import { OperatorFunction } from '../interfaces';
- /**
- * Maps each source value (an object) to its specified nested property.
- *
- * <span class="informal">Like {@link map}, but meant only for picking one of
- * the nested properties of every emitted object.</span>
- *
- * <img src="./img/pluck.png" width="100%">
- *
- * 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 <caption>Map every click to the tagName of the clicked target element</caption>
- * 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<T, R>(...properties: string[]): OperatorFunction<T, R>;
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