update

node_modules/rxjs/operator/map.d.ts

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+import { Observable } from '../Observable';
+/**
+ * Applies a given `project` function to each value emitted by the source
+ * Observable, and emits the resulting values as an Observable.
+ *
+ * <span class="informal">Like [Array.prototype.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map),
+ * it passes each source value through a transformation function to get
+ * corresponding output values.</span>
+ *
+ * <img src="./img/map.png" width="100%">
+ *
+ * Similar to the well known `Array.prototype.map` function, this operator
+ * applies a projection to each value and emits that projection in the output
+ * Observable.
+ *
+ * @example <caption>Map every click to the clientX position of that click</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var positions = clicks.map(ev => ev.clientX);
+ * positions.subscribe(x => console.log(x));
+ *
+ * @see {@link mapTo}
+ * @see {@link pluck}
+ *
+ * @param {function(value: T, index: number): R} project The function to apply
+ * to each `value` emitted by the source Observable. The `index` parameter is
+ * the number `i` for the i-th emission that has happened since the
+ * subscription, starting from the number `0`.
+ * @param {any} [thisArg] An optional argument to define what `this` is in the
+ * `project` function.
+ * @return {Observable<R>} An Observable that emits the values from the source
+ * Observable transformed by the given `project` function.
+ * @method map
+ * @owner Observable
+ */
+export declare function map<T, R>(this: Observable<T>, project: (value: T, index: number) => R, thisArg?: any): Observable<R>;