raid-addons/lib/lock.js

Add-ons functions for use with Raid

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.lock = void 0;

/**
 * @param {Raid::Signal} signal - the Raid::Signal to attach to
 * @returns {Func} void - a function to dispose the current update function
 */
var lock = function lock(signal) {
  var dispose = null;
  var cached = [];
  return function (fn) {
    if (dispose) {
      dispose();
    }

    cached.push(fn);
    dispose = signal.register(fn);
    return function () {
      // Dispose from signal, dump from cached update array
      dispose();
      cached.pop(); // If there was a previous one, reinstate it

      var last = cached.pop();

      if (last) {
        dispose = signal.register(last);
      }
    };
  };
};

exports.lock = lock;