node_modules/rxjs/dist/esm/internal/operators/map.js

import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
export function map(project, thisArg) {
    return operate((source, subscriber) => {
        let index = 0;
        source.subscribe(createOperatorSubscriber(subscriber, (value) => {
            subscriber.next(project.call(thisArg, value, index++));
        }));
    });
}
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