broadcast-channel - npm Package Compare versions

Comparing version 3.4.1 to 3.5.0

CHANGELOG.md

@@ -5,2 +5,7 @@ # CHANGELOG
 
+## 3.5.0 (11 March 2021)
+
+Features:
+  - Added `LeaderElector.onduplicate`
+
 ## 3.4.0 (24 January 2021)
@@ -7,0 +12,0 @@

dist/es/index.es5.js

@@ -9,3 +9,3 @@ /**
  */
-import { BroadcastChannel, createLeaderElection, clearNodeFolder, enforceOptions } from './index.js';
+import { BroadcastChannel, createLeaderElection, clearNodeFolder, enforceOptions, beLeader } from './index.js';
 module.exports = {
@@ -15,3 +15,4 @@ BroadcastChannel: BroadcastChannel,
   clearNodeFolder: clearNodeFolder,
-  enforceOptions: enforceOptions
+  enforceOptions: enforceOptions,
+  beLeader: beLeader
 };

dist/es/index.js

 export { BroadcastChannel, clearNodeFolder, enforceOptions } from './broadcast-channel';
-export { createLeaderElection } from './leader-election';
+export { createLeaderElection, beLeader } from './leader-election';

dist/es/leader-election.js

@@ -19,2 +19,7 @@ import { sleep, randomToken } from './util.js';
   this._invs = []; // _intervals
+
+  this._dpL = function () {}; // onduplicate listener
+
+
+  this._dpLC = false; // true when onduplicate called
 };
@@ -71,3 +76,3 @@
     }).then(function () {
-      return _beLeader(_this);
+      return beLeader(_this);
     }) // no one disagreed -> this one is now leader
@@ -101,2 +106,7 @@ .then(function () {
   },
+
+  set onduplicate(fn) {
+    this._dpL = fn;
+  },
+
   die: function die() {
@@ -129,4 +139,7 @@ var _this2 = this;
 
-    var finish = function finish() {
-      if (resolved) return;
+    function finish() {
+      if (resolved) {
+        return;
+      }
+
       resolved = true;
@@ -138,7 +151,9 @@ clearInterval(interval);
       res(true);
-    }; // try once now
+    } // try once now
 
 
     leaderElector.applyOnce().then(function () {
-      if (leaderElector.isLeader) finish();
+      if (leaderElector.isLeader) {
+        finish();
+      }
     }); // try on fallbackInterval
@@ -148,3 +163,5 @@
       leaderElector.applyOnce().then(function () {
-        if (leaderElector.isLeader) finish();
+        if (leaderElector.isLeader) {
+          finish();
+        }
       });
@@ -183,3 +200,3 @@ }, leaderElector._options.fallbackInterval);
 
-function _beLeader(leaderElector) {
+export function beLeader(leaderElector) {
   leaderElector.isLeader = true;
@@ -196,2 +213,20 @@ var unloadFn = unload.add(function () {
     }
+
+    if (msg.context === 'leader' && msg.action === 'tell' && !leaderElector._dpLC) {
+      /**
+       * another instance is also leader!
+       * This can happen on rare events
+       * like when the CPU is at 100% for long time
+       * or the tabs are open very long and the browser throttles them.
+       * @link https://github.com/pubkey/broadcast-channel/issues/414
+       * @link https://github.com/pubkey/broadcast-channel/issues/385
+       */
+      leaderElector._dpLC = true;
+
+      leaderElector._dpL(); // message the lib user so the app can handle the problem
+
+
+      _sendMessage(leaderElector, 'tell'); // ensure other leader also knows the problem
+
+    }
   };
@@ -198,0 +233,0 @@

dist/lib/browser.js

@@ -277,3 +277,4 @@ (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
   clearNodeFolder: _index.clearNodeFolder,
-  enforceOptions: _index.enforceOptions
+  enforceOptions: _index.enforceOptions,
+  beLeader: _index.beLeader
 };
@@ -310,2 +311,8 @@ },{"./index.js":4}],4:[function(require,module,exports){
 });
+Object.defineProperty(exports, "beLeader", {
+  enumerable: true,
+  get: function get() {
+    return _leaderElection.beLeader;
+  }
+});
 
@@ -323,2 +330,3 @@ var _broadcastChannel = require("./broadcast-channel");
 });
+exports.beLeader = beLeader;
 exports.createLeaderElection = createLeaderElection;
@@ -345,2 +353,7 @@
   this._invs = []; // _intervals
+
+  this._dpL = function () {}; // onduplicate listener
+
+
+  this._dpLC = false; // true when onduplicate called
 };
@@ -397,3 +410,3 @@
     }).then(function () {
-      return _beLeader(_this);
+      return beLeader(_this);
     }) // no one disagreed -> this one is now leader
@@ -427,2 +440,7 @@ .then(function () {
   },
+
+  set onduplicate(fn) {
+    this._dpL = fn;
+  },
+
   die: function die() {
@@ -455,4 +473,7 @@ var _this2 = this;
 
-    var finish = function finish() {
-      if (resolved) return;
+    function finish() {
+      if (resolved) {
+        return;
+      }
+
       resolved = true;
@@ -464,7 +485,9 @@ clearInterval(interval);
       res(true);
-    }; // try once now
+    } // try once now
 
 
     leaderElector.applyOnce().then(function () {
-      if (leaderElector.isLeader) finish();
+      if (leaderElector.isLeader) {
+        finish();
+      }
     }); // try on fallbackInterval
@@ -474,3 +497,5 @@
       leaderElector.applyOnce().then(function () {
-        if (leaderElector.isLeader) finish();
+        if (leaderElector.isLeader) {
+          finish();
+        }
       });
@@ -509,3 +534,3 @@ }, leaderElector._options.fallbackInterval);
 
-function _beLeader(leaderElector) {
+function beLeader(leaderElector) {
   leaderElector.isLeader = true;
@@ -523,2 +548,20 @@
     }
+
+    if (msg.context === 'leader' && msg.action === 'tell' && !leaderElector._dpLC) {
+      /**
+       * another instance is also leader!
+       * This can happen on rare events
+       * like when the CPU is at 100% for long time
+       * or the tabs are open very long and the browser throttles them.
+       * @link https://github.com/pubkey/broadcast-channel/issues/414
+       * @link https://github.com/pubkey/broadcast-channel/issues/385
+       */
+      leaderElector._dpLC = true;
+
+      leaderElector._dpL(); // message the lib user so the app can handle the problem
+
+
+      _sendMessage(leaderElector, 'tell'); // ensure other leader also knows the problem
+
+    }
   };
@@ -525,0 +568,0 @@

dist/lib/browser.min.js

@@ -1,1 +0,1 @@
-!function r(o,i,s){function a(t,e){if(!i[t]){if(!o[t]){var n="function"==typeof require&&require;if(!e&&n)return n(t,!0);if(u)return u(t,!0);throw(n=new Error("Cannot find module '"+t+"'")).code="MODULE_NOT_FOUND",n}n=i[t]={exports:{}},o[t][0].call(n.exports,function(e){return a(o[t][1][e]||e)},n,n.exports,r,o,i,s)}return i[t].exports}for(var u="function"==typeof require&&require,e=0;e<s.length;e++)a(s[e]);return a}({1:[function(e,t,n){"use strict";Object.defineProperty(n,"__esModule",{value:!0}),n.clearNodeFolder=function(e){e=(0,s.fillOptionsWithDefaults)(e);e=(0,i.chooseMethod)(e);return"node"===e.type?e.clearNodeFolder().then(function(){return!0}):Promise.resolve(!1)},n.enforceOptions=function(e){r=e},n.BroadcastChannel=void 0;var r,o=e("./util.js"),i=e("./method-chooser.js"),s=e("./options.js"),e=function(e,t){var n;this.name=e,r&&(t=r),this.options=(0,s.fillOptionsWithDefaults)(t),this.method=(0,i.chooseMethod)(this.options),this._iL=!1,this._onML=null,this._addEL={message:[],internal:[]},this._befC=[],this._prepP=null,t=(n=this).method.create(n.name,n.options),(0,o.isPromise)(t)?(n._prepP=t).then(function(e){n._state=e}):n._state=t};function a(e,t,n){var r={time:e.method.microSeconds(),type:t,data:n};return(e._prepP||Promise.resolve()).then(function(){return e.method.postMessage(e._state,r)})}function u(e){return 0<e._addEL.message.length||0<e._addEL.internal.length}function c(e,t,n){var r,o,i;e._addEL[t].push(n),!(r=e)._iL&&u(r)&&(o=function(t){r._addEL[t.type].forEach(function(e){t.time>=e.time&&e.fn(t.data)})},i=r.method.microSeconds(),r._prepP?r._prepP.then(function(){r._iL=!0,r.method.onMessage(r._state,o,i)}):(r._iL=!0,r.method.onMessage(r._state,o,i)))}function l(e,t,n){e._addEL[t]=e._addEL[t].filter(function(e){return e!==n}),(t=e)._iL&&!u(t)&&(t._iL=!1,e=t.method.microSeconds(),t.method.onMessage(t._state,null,e))}(n.BroadcastChannel=e)._pubkey=!0,e.prototype={postMessage:function(e){if(this.closed)throw new Error("BroadcastChannel.postMessage(): Cannot post message after channel has closed");return a(this,"message",e)},postInternal:function(e){return a(this,"internal",e)},set onmessage(e){var t={time:this.method.microSeconds(),fn:e};l(this,"message",this._onML),e&&"function"==typeof e?(this._onML=t,c(this,"message",t)):this._onML=null},addEventListener:function(e,t){var n=this.method.microSeconds();c(this,e,{time:n,fn:t})},removeEventListener:function(e,t){var n=this._addEL[e].find(function(e){return e.fn===t});l(this,e,n)},close:function(){var e=this;if(!this.closed){this.closed=!0;var t=this._prepP||Promise.resolve();return this._onML=null,this._addEL.message=[],t.then(function(){return Promise.all(e._befC.map(function(e){return e()}))}).then(function(){return e.method.close(e._state)})}},get type(){return this.method.type}}},{"./method-chooser.js":6,"./options.js":12,"./util.js":13}],2:[function(e,t,n){"use strict";var r=e("./index.es5.js"),e=r.BroadcastChannel,r=r.createLeaderElection;window.BroadcastChannel2=e,window.createLeaderElection=r},{"./index.es5.js":3}],3:[function(e,t,n){"use strict";e=e("./index.js");t.exports={BroadcastChannel:e.BroadcastChannel,createLeaderElection:e.createLeaderElection,clearNodeFolder:e.clearNodeFolder,enforceOptions:e.enforceOptions}},{"./index.js":4}],4:[function(e,t,n){"use strict";Object.defineProperty(n,"__esModule",{value:!0}),Object.defineProperty(n,"BroadcastChannel",{enumerable:!0,get:function(){return r.BroadcastChannel}}),Object.defineProperty(n,"clearNodeFolder",{enumerable:!0,get:function(){return r.clearNodeFolder}}),Object.defineProperty(n,"enforceOptions",{enumerable:!0,get:function(){return r.enforceOptions}}),Object.defineProperty(n,"createLeaderElection",{enumerable:!0,get:function(){return o.createLeaderElection}});var r=e("./broadcast-channel"),o=e("./leader-election")},{"./broadcast-channel":1,"./leader-election":5}],5:[function(e,t,n){"use strict";var r=e("@babel/runtime/helpers/interopRequireDefault");Object.defineProperty(n,"__esModule",{value:!0}),n.createLeaderElection=function(e,t){if(e._leaderElector)throw new Error("BroadcastChannel already has a leader-elector");t=function(e,t){e=e||{};(e=JSON.parse(JSON.stringify(e))).fallbackInterval||(e.fallbackInterval=3e3);e.responseTime||(e.responseTime=t.method.averageResponseTime(t.options));return e}(t,e);var n=new o(e,t);return e._befC.push(function(){return n.die()}),e._leaderElector=n};var i=e("./util.js"),s=r(e("unload")),o=function(e,t){this._channel=e,this._options=t,this.isLeader=!1,this.isDead=!1,this.token=(0,i.randomToken)(),this._isApl=!1,this._reApply=!1,this._unl=[],this._lstns=[],this._invs=[]};function a(e,t){t={context:"leader",action:t,token:e.token};return e._channel.postInternal(t)}o.prototype={applyOnce:function(){var 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t._channel.removeEventListener("internal",n),t._isApl=!1,!e&&t._reApply?(t._reApply=!1,t.applyOnce()):e})},awaitLeadership:function(){var i;return this._aLP||(this._aLP=(i=this).isLeader?Promise.resolve():new Promise(function(e){function t(){n||(n=!0,clearInterval(r),i._channel.removeEventListener("internal",o),e(!0))}var n=!1;i.applyOnce().then(function(){i.isLeader&&t()});var r=setInterval(function(){i.applyOnce().then(function(){i.isLeader&&t()})},i._options.fallbackInterval);i._invs.push(r);var o=function(e){"leader"===e.context&&"death"===e.action&&i.applyOnce().then(function(){i.isLeader&&t()})};i._channel.addEventListener("internal",o),i._lstns.push(o)})),this._aLP},die:function(){var t=this;if(!this.isDead)return this.isDead=!0,this._lstns.forEach(function(e){return t._channel.removeEventListener("internal",e)}),this._invs.forEach(function(e){return 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d(e,t){var n=o+e,e=function(e){e.key===n&&t(JSON.parse(e.newValue))};return window.addEventListener("storage",e),e}function f(e){window.removeEventListener("storage",e)}function h(e,t){if(t=(0,s.fillOptionsWithDefaults)(t),!v())throw new Error("BroadcastChannel: localstorage cannot be used");var n=(0,a.randomToken)(),r=new i.default(t.localstorage.removeTimeout),o={channelName:e,uuid:n,eMIs:r};return o.listener=d(e,function(e){o.messagesCallback&&e.uuid!==n&&e.token&&!r.has(e.token)&&(e.data.time&&e.data.time<o.messagesCallbackTime||(r.add(e.token),o.messagesCallback(e.data)))}),o}function p(e){f(e.listener)}function m(e,t,n){e.messagesCallbackTime=n,e.messagesCallback=t}function v(){if(a.isNode)return!1;var e=u();if(!e)return!1;try{var t="__broadcastchannel_check";e.setItem(t,"works"),e.removeItem(t)}catch(e){return!1}return!0}function b(){var e=navigator.userAgent.toLowerCase();return 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overwrite window.BroadcastChannel with this module, this is not a polyfill");return!0}function c(){return 150}e={create:o,close:i,onMessage:a,postMessage:s,canBeUsed:u,type:n.type="native",averageResponseTime:c,microSeconds:e};n.default=e},{"../util":13}],10:[function(e,t,n){"use strict";Object.defineProperty(n,"__esModule",{value:!0}),n.create=i,n.close=s,n.postMessage=a,n.onMessage=u,n.canBeUsed=c,n.averageResponseTime=l,n.default=n.type=n.microSeconds=void 0;var r=e("../util").microSeconds;n.microSeconds=r;e="simulate";n.type=e;var o=new Set;function i(e){e={name:e,messagesCallback:null};return o.add(e),e}function s(e){o.delete(e)}function a(t,n){return new Promise(function(e){return setTimeout(function(){Array.from(o).filter(function(e){return e.name===t.name}).filter(function(e){return e!==t}).filter(function(e){return!!e.messagesCallback}).forEach(function(e){return e.messagesCallback(n)}),e()},5)})}function u(e,t){e.messagesCallback=t}function c(){return!0}function l(){return 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strict";Object.defineProperty(n,"__esModule",{value:!0}),n.default=void 0;var r={add:function(e){"function"==typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope||"function"==typeof window.addEventListener&&(window.addEventListener("beforeunload",function(){e()},!0),window.addEventListener("unload",function(){e()},!0))}};n.default=r},{}],19:[function(e,t,n){"use strict";var r=e("@babel/runtime/helpers/interopRequireDefault");Object.defineProperty(n,"__esModule",{value:!0}),n.add=c,n.runAll=l,n.removeAll=d,n.getSize=f,n.default=void 0;var o=r(e("detect-node")),i=r(e("./browser.js")),e=r(e("./node.js")),s=(o.default?e:i).default,a=new Set,u=!1;function c(e){if(u||(u=!0,s.add(l)),"function"!=typeof e)throw new Error("Listener is no function");return a.add(e),{remove:function(){return a.delete(e)},run:function(){return a.delete(e),e()}}}function l(){var t=[];return a.forEach(function(e){t.push(e()),a.delete(e)}),Promise.all(t)}function d(){a.clear()}function f(){return a.size}i={add:c,runAll:l,removeAll:d,getSize:f};n.default=i},{"./browser.js":18,"./node.js":15,"@babel/runtime/helpers/interopRequireDefault":14,"detect-node":16}]},{},[2]);

dist/lib/index.es5.js

@@ -17,3 +17,4 @@ "use strict";
   clearNodeFolder: _index.clearNodeFolder,
-  enforceOptions: _index.enforceOptions
+  enforceOptions: _index.enforceOptions,
+  beLeader: _index.beLeader
 };

dist/lib/index.js

@@ -30,2 +30,8 @@ "use strict";
 });
+Object.defineProperty(exports, "beLeader", {
+  enumerable: true,
+  get: function get() {
+    return _leaderElection.beLeader;
+  }
+});
 
@@ -32,0 +38,0 @@ var _broadcastChannel = require("./broadcast-channel");

dist/lib/leader-election.js

@@ -8,2 +8,3 @@ "use strict";
 });
+exports.beLeader = beLeader;
 exports.createLeaderElection = createLeaderElection;
@@ -30,2 +31,7 @@
   this._invs = []; // _intervals
+
+  this._dpL = function () {}; // onduplicate listener
+
+
+  this._dpLC = false; // true when onduplicate called
 };
@@ -82,3 +88,3 @@
     }).then(function () {
-      return _beLeader(_this);
+      return beLeader(_this);
     }) // no one disagreed -> this one is now leader
@@ -112,2 +118,7 @@ .then(function () {
   },
+
+  set onduplicate(fn) {
+    this._dpL = fn;
+  },
+
   die: function die() {
@@ -140,4 +151,7 @@ var _this2 = this;
 
-    var finish = function finish() {
-      if (resolved) return;
+    function finish() {
+      if (resolved) {
+        return;
+      }
+
       resolved = true;
@@ -149,7 +163,9 @@ clearInterval(interval);
       res(true);
-    }; // try once now
+    } // try once now
 
 
     leaderElector.applyOnce().then(function () {
-      if (leaderElector.isLeader) finish();
+      if (leaderElector.isLeader) {
+        finish();
+      }
     }); // try on fallbackInterval
@@ -159,3 +175,5 @@
       leaderElector.applyOnce().then(function () {
-        if (leaderElector.isLeader) finish();
+        if (leaderElector.isLeader) {
+          finish();
+        }
       });
@@ -194,3 +212,3 @@ }, leaderElector._options.fallbackInterval);
 
-function _beLeader(leaderElector) {
+function beLeader(leaderElector) {
   leaderElector.isLeader = true;
@@ -208,2 +226,20 @@
     }
+
+    if (msg.context === 'leader' && msg.action === 'tell' && !leaderElector._dpLC) {
+      /**
+       * another instance is also leader!
+       * This can happen on rare events
+       * like when the CPU is at 100% for long time
+       * or the tabs are open very long and the browser throttles them.
+       * @link https://github.com/pubkey/broadcast-channel/issues/414
+       * @link https://github.com/pubkey/broadcast-channel/issues/385
+       */
+      leaderElector._dpLC = true;
+
+      leaderElector._dpL(); // message the lib user so the app can handle the problem
+
+
+      _sendMessage(leaderElector, 'tell'); // ensure other leader also knows the problem
+
+    }
   };
@@ -210,0 +246,0 @@

package.json

 {
   "name": "broadcast-channel",
-  "version": "3.4.1",
+  "version": "3.5.0",
   "description": "A BroadcastChannel that works in New Browsers, Old Browsers, WebWorkers and NodeJs",
@@ -76,12 +76,12 @@ "homepage": "https://github.com/pubkey/broadcast-channel#readme",
   "devDependencies": {
-    "@babel/cli": "7.12.10",
-    "@babel/core": "7.12.10",
+    "@babel/cli": "7.13.10",
+    "@babel/core": "7.13.10",
     "@babel/plugin-check-constants": "7.0.0-beta.38",
-    "@babel/plugin-proposal-object-rest-spread": "7.12.1",
-    "@babel/plugin-transform-member-expression-literals": "7.12.1",
-    "@babel/plugin-transform-property-literals": "7.12.1",
-    "@babel/plugin-transform-runtime": "7.12.10",
+    "@babel/plugin-proposal-object-rest-spread": "7.13.8",
+    "@babel/plugin-transform-member-expression-literals": "7.12.13",
+    "@babel/plugin-transform-property-literals": "7.12.13",
+    "@babel/plugin-transform-runtime": "7.13.10",
     "@babel/polyfill": "7.12.1",
-    "@babel/preset-env": "7.12.11",
-    "@babel/types": "7.12.12",
+    "@babel/preset-env": "7.13.10",
+    "@babel/types": "7.13.0",
     "@types/core-js": "2.5.4",
@@ -93,11 +93,11 @@ "assert": "2.0.0",
     "clone": "2.1.2",
-    "concurrently": "5.3.0",
+    "concurrently": "6.0.0",
     "convert-hrtime": "3.0.0",
     "copyfiles": "2.4.1",
     "cross-env": "7.0.3",
-    "eslint": "7.18.0",
+    "eslint": "7.21.0",
     "gzip-size-cli": "4.0.0",
     "http-server": "0.12.3",
     "jest": "26.6.3",
-    "karma": "6.0.1",
+    "karma": "6.1.2",
     "karma-babel-preprocessor": "8.0.1",
@@ -114,16 +114,16 @@ "karma-browserify": "8.0.0",
     "karma-safari-launcher": "1.0.0",
-    "mocha": "8.2.1",
+    "mocha": "8.3.1",
     "pre-commit": "1.2.2",
     "random-int": "2.0.1",
     "random-token": "0.0.8",
-    "rollup": "2.38.0",
+    "rollup": "2.41.0",
     "rollup-plugin-node-resolve": "5.2.0",
     "rollup-plugin-uglify": "6.0.4",
-    "testcafe": "1.10.1",
-    "testcafe-hammerhead": "19.1.1",
+    "testcafe": "1.12.0",
+    "testcafe-hammerhead": "19.4.2",
     "ts-node": "9.1.1",
-    "typescript": "4.1.3",
-    "watchify": "3.11.1",
-    "webpack": "5.17.0",
-    "webpack-cli": "4.4.0"
+    "typescript": "4.2.3",
+    "watchify": "4.0.0",
+    "webpack": "5.24.4",
+    "webpack-cli": "4.5.0"
   },
@@ -130,0 +130,0 @@ "browser": {

src/index.es5.js

@@ -14,3 +14,4 @@ /**
     clearNodeFolder,
-    enforceOptions
+    enforceOptions,
+    beLeader
 } from './index.js';
@@ -22,3 +23,4 @@
     clearNodeFolder,
-    enforceOptions
-};
+    enforceOptions,
+    beLeader
+};

src/index.js

@@ -7,3 +7,4 @@ export {
 export {
-    createLeaderElection
-} from './leader-election';
+    createLeaderElection,
+    beLeader
+} from './leader-election';

src/leader-election.js

@@ -23,2 +23,4 @@ import {
     this._invs = []; // _intervals
+    this._dpL = () => { }; // onduplicate listener
+    this._dpLC = false; // true when onduplicate called
 };
@@ -74,3 +76,3 @@
             })
-            .then(() => _beLeader(this)) // no one disagreed -> this one is now leader
+            .then(() => beLeader(this)) // no one disagreed -> this one is now leader
             .then(() => true)
@@ -99,2 +101,6 @@ .catch(() => false) // apply not successfull
 
+    set onduplicate(fn) {
+        this._dpL = fn;
+    },
+
     die() {
@@ -119,4 +125,6 @@ if (this.isDead) return;
 
-        const finish = () => {
-            if (resolved) return;
+        function finish() {
+            if (resolved) {
+                return;
+            }
             resolved = true;
@@ -126,7 +134,9 @@ clearInterval(interval);
             res(true);
-        };
+        }
 
         // try once now
         leaderElector.applyOnce().then(() => {
-            if (leaderElector.isLeader) finish();
+            if (leaderElector.isLeader) {
+                finish();
+            }
         });
@@ -137,3 +147,5 @@
             leaderElector.applyOnce().then(() => {
-                if (leaderElector.isLeader) finish();
+                if (leaderElector.isLeader) {
+                    finish();
+                }
             });
@@ -168,3 +180,3 @@ }, leaderElector._options.fallbackInterval);
 
-function _beLeader(leaderElector) {
+export function beLeader(leaderElector) {
     leaderElector.isLeader = true;
@@ -178,2 +190,16 @@ const unloadFn = unload.add(() => leaderElector.die());
         }
+
+        if (msg.context === 'leader' && msg.action === 'tell' && !leaderElector._dpLC) {
+            /**
+             * another instance is also leader!
+             * This can happen on rare events
+             * like when the CPU is at 100% for long time
+             * or the tabs are open very long and the browser throttles them.
+             * @link https://github.com/pubkey/broadcast-channel/issues/414
+             * @link https://github.com/pubkey/broadcast-channel/issues/385
+             */
+            leaderElector._dpLC = true;
+            leaderElector._dpL(); // message the lib user so the app can handle the problem
+            _sendMessage(leaderElector, 'tell'); // ensure other leader also knows the problem
+        }
     };
@@ -212,2 +238,2 @@ leaderElector._channel.addEventListener('internal', isLeaderListener);
     return elector;
-}
+}

types/broadcast-channel.d.ts

@@ -37,3 +37,3 @@ declare type MethodType = 'node' | 'idb' | 'native' | 'localstorage' | 'simulate';
 
-declare type EventType = 'message' | 'internal';
+declare type EventContext = 'message' | 'internal' | 'leader';
 
@@ -59,4 +59,4 @@ declare type OnMessageHandler<T> = ((this: BroadcastChannel, ev: T) => any) | null;
     // not defined in the offical standard
-    addEventListener(type: EventType, handler: OnMessageHandler<T>): void;
-    removeEventListener(type: EventType, handler: OnMessageHandler<T>): void;
+    addEventListener(type: EventContext, handler: OnMessageHandler<T>): void;
+    removeEventListener(type: EventContext, handler: OnMessageHandler<T>): void;
 
@@ -63,0 +63,0 @@ }

types/leader-election.d.ts

@@ -1,2 +0,6 @@
-import { BroadcastChannel } from './broadcast-channel';
+import {
+    BroadcastChannel,
+    EventContext,
+    OnMessageHandler
+} from './broadcast-channel';
 
@@ -16,3 +20,2 @@ export type LeaderElectionOptions = {
 
-
 export declare class LeaderElector {
@@ -34,3 +37,7 @@
 
-
+    /**
+     * Add an event handler that is run
+     * when it is detected that there are duplicate leaders
+     */
+    onduplicate: OnMessageHandler<T>;
 }
@@ -40,2 +47,2 @@
 
-export const createLeaderElection: CreateFunction;
+export const createLeaderElection: CreateFunction;

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Improved metrics

Total package byte prevSize

300307

increased by1.73%

Lines of code

7655

increased by1.71%

Number of lines in readme file

37

increased by8.82%

No dependency changes