multitude/dist/push/creators/interval.js

Comprehensive streams for push and pull

"use strict";

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

var _Observable = require("../classes/Observable");

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

function interval(every) {
  const options = !every || _typeCore.TypeGuard.isNumber(every) ? {
    every
  } : every;
  const cancel = options.cancel;
  const promise = _typeCore.TypeGuard.isPromiseLike(cancel) ? cancel : null;
  const callback = _typeCore.TypeGuard.isFunction(cancel) ? cancel : null;
  return new _Observable.Observable(obs => {
    let index = -1;
    const interval = setInterval(() => {
      index++;
      obs.next(index);
      if (!callback) return;

      try {
        if (callback(index)) {
          obs.complete();
          clearInterval(interval);
        }
      } catch (err) {
        obs.error(err);
      }
    }, options.every || 0);

    if (promise) {
      promise.then(() => {
        clearInterval(interval);
        obs.complete();
      }, err => {
        clearInterval(interval);
        obs.error(err);
      });
    }

    return () => clearInterval(interval);
  });
}
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