js-broadcast-channel/dist/index.js

Broadcast-js

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/index.ts
var index_exports = {};
__export(index_exports, {
  BroadcastJS: () => BroadcastJS
});
module.exports = __toCommonJS(index_exports);

// src/broadcast.ts
var _BroadcastJS = class _BroadcastJS {
  constructor(name, handlers) {
    if (!this.canBrowserSupportBroadcastJS()) {
      throw new Error("BroadcastChannel API is not supported in this browser");
    }
    if (_BroadcastJS.bcJSInstance) {
      return _BroadcastJS.bcJSInstance;
    }
    if (!_BroadcastJS.bcInstance) {
      const broadcast = new BroadcastChannel(name);
      _BroadcastJS.bcInstance = broadcast;
    }
    _BroadcastJS.handlers = handlers || {};
    _BroadcastJS.bcJSInstance = this;
    return _BroadcastJS.bcJSInstance;
  }
  /**
   * Closes the broadcast channel.
   *
   * @returns {void}
   *
   * @example
   * const broadcast = new BroadcastJS("channelName");
   * broadcast.close();
   */
  close() {
    var _a, _b, _c, _d;
    (_b = (_a = _BroadcastJS.handlers).onBeforeClose) == null ? void 0 : _b.call(_a);
    _BroadcastJS.bcInstance.close();
    _BroadcastJS.messageCallbacks.clear();
    _BroadcastJS.handlers = {};
    (_d = (_c = _BroadcastJS.handlers).onAfterClose) == null ? void 0 : _d.call(_c);
  }
  /**
   * Posts a message to the broadcast channel.
   *
   * @param {Message} message - The message to post.
   * @returns {void}
   * 
   * @example
   * const broadcast = new BroadcastJS("channelName");
   * broadcast.postMessage({ message: "message", data: { count: 0 } });
   */
  postMessage(message) {
    var _a, _b, _c, _d;
    const serializedMessage = this.createSerializedMessage(message.message, message.data, false);
    (_b = (_a = _BroadcastJS.handlers).onBeforePostMessage) == null ? void 0 : _b.call(_a, message);
    _BroadcastJS.bcInstance.postMessage(serializedMessage);
    (_d = (_c = _BroadcastJS.handlers).onAfterPostMessage) == null ? void 0 : _d.call(_c, message);
  }
  /**
   * Calls a callback when a message is received.
   *
   * @param {string} messageName - The name of the message to call the callback for.
   * @param {function} onRecieve - The callback to call when a message is received.
   * @returns {void}
   *
   * @example
   * const broadcast = new BroadcastJS("channelName");
   * broadcast.onMessage("name", (message) => {
   *     console.log(message);
   * });
   */
  onMessage(messageName, onRecieve) {
    _BroadcastJS.messageCallbacks.set(messageName, onRecieve);
    _BroadcastJS.bcInstance.onmessage = (event) => {
      var _a, _b, _c, _d, _e, _f, _g;
      const receivedMessage = JSON.parse(event.data);
      const message = this.createMessage(receivedMessage.message, receivedMessage.data, (_a = receivedMessage.isInternal) != null ? _a : false);
      if (message.isInternal) {
        _BroadcastJS.internalMessage(message.message, message);
        return;
      }
      const callback = _BroadcastJS.messageCallbacks.get(receivedMessage.message);
      if (callback) {
        (_c = (_b = _BroadcastJS.handlers).onBeforeSendMessage) == null ? void 0 : _c.call(_b, message);
        callback(message);
        (_e = (_d = _BroadcastJS.handlers).onAfterSendMessage) == null ? void 0 : _e.call(_d, message);
      } else {
        (_g = (_f = _BroadcastJS.handlers).onError) == null ? void 0 : _g.call(_f, message);
        console.error("No callback found for message with name: ", receivedMessage.message);
      }
    };
  }
  removeMessage(messageName) {
    const serializedMessage = this.createSerializedMessage("removeMessage" /* RemoveMessage */, messageName, true);
    _BroadcastJS.bcInstance.postMessage(serializedMessage);
    _BroadcastJS.messageCallbacks.delete(messageName);
  }
  canBrowserSupportBroadcastJS() {
    return typeof BroadcastChannel !== "undefined";
  }
  hasListeners(messageName) {
    return _BroadcastJS.messageCallbacks.has(messageName);
  }
  static internalMessage(messageName, message) {
    let isInternalMessage = false;
    switch (messageName) {
      case "removeMessage" /* RemoveMessage */:
        _BroadcastJS.messageCallbacks.delete(message.data);
        isInternalMessage = true;
        break;
      default:
        isInternalMessage = false;
        break;
    }
    return isInternalMessage;
  }
  // manual serialization to make it predictable
  createMessage(name, data, isInternal) {
    const message = {
      message: name,
      data,
      isInternal
    };
    return message;
  }
  createSerializedMessage(name, data, isInternal) {
    const message = this.createMessage(name, data, isInternal);
    return JSON.stringify(message);
  }
};
_BroadcastJS.messageCallbacks = /* @__PURE__ */ new Map();
_BroadcastJS.handlers = {};
var BroadcastJS = _BroadcastJS;
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  BroadcastJS
});