multitude/dist/push/operators/schedule/delay.js

Comprehensive streams for push and pull

"use strict";

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

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

var _typeCore = require("type-core");

function delay(due) {
  const options = !due || _typeCore.TypeGuard.isNumber(due) ? {
    due
  } : due;
  const condition = options.condition;
  const signals = options.signals || false;
  const ms = options.due || 0;
  return (0, _operate.operate)(obs => {
    const pending = [];
    const timeouts = new Set();

    function queue(delay, fn) {
      if (delay) {
        schedule(fn);
      } else {
        if (timeouts.size) pending.push(fn);else fn();
      }
    }

    function schedule(fn) {
      const timeout = setTimeout(() => {
        timeouts.delete(timeout);
        fn();

        if (!timeouts.size) {
          while (pending.length) {
            const item = pending.shift();
            item();
          }
        }
      }, ms);
      timeouts.add(timeout);
    }

    let index = 0;
    let final = false;
    return [null, condition ? value => queue(condition(value, index++), obs.next.bind(obs, value)) : value => queue(true, obs.next.bind(obs, value)), function error(error) {
      final = true;
      queue(signals, obs.error.bind(obs, error));
    }, function complete() {
      final = true;
      queue(signals, obs.complete.bind(obs));
    }, function teardown() {
      if (final) return;

      for (const timeout of timeouts) {
        clearTimeout(timeout);
      }
    }];
  });
}
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