electron-compile/lib/browser-signal.js

Electron supporting package to compile JS and CSS in Electron applications

'use strict';

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

var _Observable = require('rxjs/Observable');

var _Subject = require('rxjs/Subject');

require('rxjs/add/observable/throw');

const isElectron = 'type' in process;
const isBrowser = process.type === 'browser';

const ipc = !isElectron ? null : isBrowser ? require('electron').ipcMain : require('electron').ipcRenderer;

const channelList = {};

function send(channel) {
  for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
    args[_key - 1] = arguments[_key];
  }

  if (isElectron && !isBrowser) {
    ipc.send(channel, ...args);
    return;
  }

  if (!(channel in channelList)) return;

  let subj = channelList[channel].subj;

  subj.next(args);
}

function listen(channel) {
  if (isElectron && !isBrowser) return _Observable.Observable.throw(new Error("Can only call listen from browser"));

  return _Observable.Observable.create(s => {
    if (!(channel in channelList)) {
      let subj = new _Subject.Subject();
      let ipcListener = function (e) {
        for (var _len2 = arguments.length, args = Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
          args[_key2 - 1] = arguments[_key2];
        }

        subj.next(args);
      };

      channelList[channel] = { subj, refcount: 0 };
      if (isElectron && isBrowser) {
        ipc.on(channel, ipcListener);
        channelList[channel].listener = ipcListener;
      }
    }

    channelList[channel].refcount++;

    let disp = channelList[channel].subj.subscribe(s);
    disp.add(() => {
      channelList[channel].refcount--;
      if (channelList[channel].refcount > 0) return;

      if (channelList[channel].listener) {
        ipc.removeListener(channel, channelList[channel].listener);
      }

      delete channelList.channel;
    });

    return disp;
  });
}
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