@dnb/eufemia/shared/helpers/EventEmitter.js

DNB Eufemia Design System UI Library

import _defineProperty from "@babel/runtime-corejs3/helpers/esm/defineProperty";
import _pushInstanceProperty from "core-js-pure/stable/instance/push.js";
class EventEmitter {
  static createInstance(id) {
    return new EventEmitter(id);
  }
  constructor(id) {
    var _context;
    _defineProperty(this, "update", data => {
      this.set(data);
      scope.__EEE__[this.id].instances.forEach(instance => {
        instance.listeners.forEach(fn => {
          if (typeof fn === 'function') {
            fn(instance.get());
          }
        });
      });
    });
    _defineProperty(this, "set", data => {
      scope.__EEE__[this.id].data = {
        ...scope.__EEE__[this.id].data,
        ...data
      };
    });
    _defineProperty(this, "get", () => {
      return scope.__EEE__[this.id].data;
    });
    scope.__EEE__ = scope.__EEE__ || {};
    if (!scope.__EEE__[id]) {
      scope.__EEE__[id] = {
        instances: [],
        count: 0,
        data: {}
      };
    }
    scope.__EEE__[id].count = scope.__EEE__[id].count + 1;
    _pushInstanceProperty(_context = scope.__EEE__[id].instances).call(_context, this);
    this.id = id;
    this.listeners = [];
    return this;
  }
  listen(fn) {
    if (!this.listeners.includes(fn)) {
      var _context2;
      _pushInstanceProperty(_context2 = this.listeners).call(_context2, fn);
    }
    return this;
  }
  unlisten(fn) {
    for (let i = 0, l = this.listeners.length; i < l; i++) {
      if (!fn || fn && fn === this.listeners[i]) {
        this.listeners[i] = null;
      }
    }
  }
  remove() {
    this.unlisten();
    scope.__EEE__[this.id].count = scope.__EEE__[this.id].count - 1;
    if (scope.__EEE__[this.id].count <= 0) {
      delete scope[this.id];
    }
  }
}
const scope = typeof window !== 'undefined' ? window : EventEmitter;
export default EventEmitter;
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