multitude/dist/push/operators/combine/mergeMap.js

Comprehensive streams for push and pull

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.mergeMap = mergeMap;

var _operate = require("../../utils/operate");

var _intercept = require("../../utils/intercept");

function mergeMap(projection) {
  return (0, _operate.operate)(obs => {
    let index = 0;
    let parentComplete = false;
    let completeSubscriptions = 0;
    const subscriptions = [];

    function unsubscribe() {
      for (const subscription of subscriptions) {
        subscription.unsubscribe();
      }
    }

    return [null, function next(value) {
      if (obs.closed) return;
      (0, _intercept.intercept)(projection(value, index++), obs, {
        start(subscription) {
          subscriptions.push(subscription);
        },

        error(error) {
          obs.error(error);
          unsubscribe();
        },

        complete() {
          completeSubscriptions++;
          if (!parentComplete) return;

          if (completeSubscriptions >= subscriptions.length) {
            obs.complete();
            unsubscribe();
          }
        }

      });
    }, null, function complete() {
      parentComplete = true;

      if (completeSubscriptions >= subscriptions.length) {
        obs.complete();
      }
    }, function teardown() {
      if (obs.closed || !parentComplete) unsubscribe();
    }];
  });
}
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