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-import { OperatorFunction } from '../types';
-import { operate } from '../util/lift';
-import { createOperatorSubscriber } from './OperatorSubscriber';
-
-export function map<T, R>(project: (value: T, index: number) => R): OperatorFunction<T, R>;
-/** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
-export function map<T, R, A>(project: (this: A, value: T, index: number) => R, thisArg: A): OperatorFunction<T, R>;
-
-/**
- * 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>
- *
- * ![](map.png)
- *
- * 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
- *
- * Map every click to the `clientX` position of that click
- *
- * ```ts
- * import { fromEvent, map } from 'rxjs';
- *
- * const clicks = fromEvent<PointerEvent>(document, 'click');
- * const positions = clicks.pipe(map(ev => ev.clientX));
- *
- * positions.subscribe(x => console.log(x));
- * ```
- *
- * @see {@link mapTo}
- * @see {@link pluck}
- *
- * @param 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 thisArg An optional argument to define what `this` is in the
- * `project` function.
- * @return A function that returns an Observable that emits the values from the
- * source Observable transformed by the given `project` function.
- */
-export function map<T, R>(project: (value: T, index: number) => R, thisArg?: any): OperatorFunction<T, R> {
- return operate((source, subscriber) => {
- // The index of the value from the source. Used with projection.
- let index = 0;
- // Subscribe to the source, all errors and completions are sent along
- // to the consumer.
- source.subscribe(
- createOperatorSubscriber(subscriber, (value: T) => {
- // Call the projection function with the appropriate this context,
- // and send the resulting value to the consumer.
- subscriber.next(project.call(thisArg, value, index++));
- })
- );
- });
-}
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