chore(release): 4.2.4

Diff: https://github.com/socketio/socket.io-parser/compare/4.2.3...4.2.4

.github/workflows/ci.yml

@@ -2,8 +2,9 @@ name: CI
 
 on:
   push:
-    branches:
-      - 'socket.io-parser/3.4.x'
+  pull_request:
+  schedule:
+    - cron: '0 0 * * 0'
 
 permissions:
   contents: read
@@ -14,17 +15,15 @@ jobs:
     timeout-minutes: 10
 
     strategy:
-      fail-fast: false
       matrix:
-        node-version:
-          - 16
+        node-version: [14, 16]
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v3
 
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
 
@@ -33,3 +32,25 @@ jobs:
 
       - name: Run tests
         run: npm test
+
+  test-browser:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Use Node.js 16
+        uses: actions/setup-node@v3
+        with:
+          node-version: 16
+
+      - name: Install dependencies
+        run: npm ci
+
+      - run: npm test
+        env:
+          BROWSERS: 1
+          SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
+          SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}

.github/workflows/publish.yml

@@ -1,31 +0,0 @@
-# reference: https://docs.npmjs.com/trusted-publishers#for-github-actions
-
-name: Publish
-
-on:
-  push:
-    tags:
-      - 'socket.io-parser@*'
-
-jobs:
-  publish:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      id-token: write
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
-
-      - name: Use Node.js 24
-        uses: actions/setup-node@v6
-        with:
-          node-version: 24
-          registry-url: 'https://registry.npmjs.org'
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Publish package
-        run: npm publish --tag v2-latest

.gitignore

@@ -1,3 +1,3 @@
 node_modules
-build
-components
+dist/
+build/

CHANGELOG.md

@@ -1,9 +1,56 @@
-## [3.4.4](https://github.com/socketio/socket.io-parser/compare/3.4.3...3.4.4) (2026-03-17)
+# History
+
+## 2023
+
+- [4.2.4](#424-2023-05-31) (May 2023)
+- [3.4.3](#343-2023-05-22) (May 2023) (from the [3.4.x](https://github.com/socketio/socket.io-parser/tree/3.4.x) branch)
+- [4.2.3](#423-2023-05-22) (May 2023)
+- [4.2.2](#422-2023-01-19) (Jan 2023)
+
+## 2022
+
+- [3.3.3](#333-2022-11-09) (Nov 2022) (from the [3.3.x](https://github.com/socketio/socket.io-parser/tree/3.3.x) branch)
+- [3.4.2](#342-2022-11-09) (Nov 2022) (from the [3.4.x](https://github.com/socketio/socket.io-parser/tree/3.4.x) branch)
+- [4.0.5](#405-2022-06-27) (Jun 2022) (from the [4.0.x](https://github.com/socketio/socket.io-parser/tree/4.0.x) branch)
+- [4.2.1](#421-2022-06-27) (Jun 2022)
+- [4.2.0](#420-2022-04-17) (Apr 2022)
+- [4.1.2](#412-2022-02-17) (Feb 2022)
+
+## 2021
+
+- [4.1.1](#411-2021-10-14) (Oct 2021)
+- [4.1.0](#410-2021-10-11) (Oct 2021)
+- [4.0.4](#404-2021-01-15) (Jan 2021)
+- [3.3.2](#332-2021-01-09) (Jan 2021) (from the [3.3.x](https://github.com/socketio/socket.io-parser/tree/3.3.x) branch)
+- [4.0.3](#403-2021-01-05) (Jan 2021)
+
+## 2020
+
+- [4.0.2](#402-2020-11-25) (Nov 2020)
+- [4.0.1](#401-2020-11-05) (Nov 2020)
+- [3.3.1](#331-2020-09-30) (Sep 2020) (from the [3.3.x](https://github.com/socketio/socket.io-parser/tree/3.3.x) branch)
+- [**4.0.0**](#400-2020-09-28) (Sep 2020)
+- [3.4.1](#341-2020-05-13) (May 2020)
+
+## 2019
+
+- [3.4.0](#340-2019-09-20) (Sep 2019)
+
+## 2018
+
+- [3.3.0](#330-2018-11-07) (Nov 2018)
+
+
+
+# Release notes
+
+## [4.2.4](https://github.com/socketio/socket.io-parser/compare/4.2.3...4.2.4) (2023-05-31)
 
 
 ### Bug Fixes
 
-* add a limit to the number of binary attachments ([719f9eb](https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4))
+* ensure reserved events cannot be used as event names ([d9db473](https://github.com/socketio/socket.io-parser/commit/d9db4737a3c8ce5f1f49ecc8d928a74f3da591f7))
+* properly detect plain objects ([b0e6400](https://github.com/socketio/socket.io-parser/commit/b0e6400c93b5c4aa25e6a629d6448b8627275213))
 
 
 
@@ -16,6 +63,34 @@
 
 
 
+## [4.2.3](https://github.com/socketio/socket.io-parser/compare/4.2.2...4.2.3) (2023-05-22)
+
+
+### Bug Fixes
+
+* check the format of the event name ([3b78117](https://github.com/socketio/socket.io-parser/commit/3b78117bf6ba7e99d7a5cfc1ba54d0477554a7f3))
+
+
+
+## [4.2.2](https://github.com/socketio/socket.io-parser/compare/4.2.1...4.2.2) (2023-01-19)
+
+
+### Bug Fixes
+
+* calling destroy() should clear all internal state ([22c42e3](https://github.com/socketio/socket.io-parser/commit/22c42e3545e4adbc5931276c378f5d62c8b3854a))
+* do not modify the input packet upon encoding ([ae8dd88](https://github.com/socketio/socket.io-parser/commit/ae8dd88995dbd7f89c97e5cc15e5b489fa0efece))
+
+
+
+## [3.3.3](https://github.com/Automattic/socket.io-parser/compare/3.3.2...3.3.3) (2022-11-09)
+
+
+### Bug Fixes
+
+* check the format of the index of each attachment ([fb21e42](https://github.com/Automattic/socket.io-parser/commit/fb21e422fc193b34347395a33e0f625bebc09983))
+
+
+
 ## [3.4.2](https://github.com/socketio/socket.io-parser/compare/3.4.1...3.4.2) (2022-11-09)
 
 
@@ -25,9 +100,159 @@
 
 
 
+## [4.2.1](https://github.com/socketio/socket.io-parser/compare/4.2.0...4.2.1) (2022-06-27)
+
+
+### Bug Fixes
+
+* check the format of the index of each attachment ([b5d0cb7](https://github.com/socketio/socket.io-parser/commit/b5d0cb7dc56a0601a09b056beaeeb0e43b160050))
+
+
+
+## [4.0.5](https://github.com/socketio/socket.io-parser/compare/4.0.4...4.0.5) (2022-06-27)
+
+
+### Bug Fixes
+
+* check the format of the index of each attachment ([b559f05](https://github.com/socketio/socket.io-parser/commit/b559f050ee02bd90bd853b9823f8de7fa94a80d4))
+
+
+
+## [4.2.0](https://github.com/socketio/socket.io-parser/compare/4.1.2...4.2.0) (2022-04-17)
+
+
+### Features
+
+* allow the usage of custom replacer and reviver ([#112](https://github.com/socketio/socket.io-parser/issues/112)) ([b08bc1a](https://github.com/socketio/socket.io-parser/commit/b08bc1a93e8e3194b776c8a0bdedee1e29333680))
+
+
+
+## [4.1.2](https://github.com/socketio/socket.io-parser/compare/4.1.1...4.1.2) (2022-02-17)
+
+
+### Bug Fixes
+
+* allow objects with a null prototype in binary packets ([#114](https://github.com/socketio/socket.io-parser/issues/114)) ([7f6b262](https://github.com/socketio/socket.io-parser/commit/7f6b262ac83bdf43c53a7eb02417e56e0cf491c8))
+
+
+
+## [4.1.1](https://github.com/socketio/socket.io-parser/compare/4.1.0...4.1.1) (2021-10-14)
+
+
+## [4.1.0](https://github.com/socketio/socket.io-parser/compare/4.0.4...4.1.0) (2021-10-11)
+
+
+### Features
+
+* provide an ESM build with and without debug ([388c616](https://github.com/socketio/socket.io-parser/commit/388c616a9221e4341945f8487e729e93a81d2da5))
+
+
+## [4.0.4](https://github.com/socketio/socket.io-parser/compare/4.0.3...4.0.4) (2021-01-15)
+
+
+### Bug Fixes
+
+* allow integers as event names ([1c220dd](https://github.com/socketio/socket.io-parser/commit/1c220ddbf45ea4b44bc8dbf6f9ae245f672ba1b9))
+
+
+
+## [3.3.2](https://github.com/Automattic/socket.io-parser/compare/3.3.1...3.3.2) (2021-01-09)
+
+
+### Bug Fixes
+
+* prevent DoS (OOM) via massive packets ([#95](https://github.com/Automattic/socket.io-parser/issues/95)) ([89197a0](https://github.com/Automattic/socket.io-parser/commit/89197a05c43b18cc4569fd178d56e7bb8f403865))
+
+
+
+## [4.0.3](https://github.com/socketio/socket.io-parser/compare/4.0.2...4.0.3) (2021-01-05)
+
+
+## [4.0.2](https://github.com/socketio/socket.io-parser/compare/4.0.1...4.0.2) (2020-11-25)
+
+
+### Bug Fixes
+
+* move @types/component-emitter to dependencies ([#99](https://github.com/socketio/socket.io-parser/issues/99)) ([4efa005](https://github.com/socketio/socket.io-parser/commit/4efa005846ae15ecc7fb0a7f27141439113b1179))
+
+
+## [4.0.1](https://github.com/socketio/socket.io-parser/compare/3.4.1...4.0.1) (2020-11-05)
+
+### Features
+
+* move binary detection back to the parser ([285e7cd](https://github.com/socketio/socket.io-parser/commit/285e7cd0d837adfc911c999e7294788681226ae1))
+* add support for a payload in a CONNECT packet ([78f9fc2](https://github.com/socketio/socket.io-parser/commit/78f9fc2999b15804b02f2c22a2b4007734a26af9))
+
+### Bug Fixes
+
+* do not catch encoding errors ([aeae87c](https://github.com/socketio/socket.io-parser/commit/aeae87c220287197cb78370dbd86b950a7dd29eb))
+* throw upon invalid payload format ([c327acb](https://github.com/socketio/socket.io-parser/commit/c327acbc3c3c2d0b2b439136cbcb56c81db173d6))
+
+### BREAKING CHANGES
+
+* the encode method is now synchronous ([28d4f03](https://github.com/socketio/socket.io-parser/commit/28d4f0309bdd9e306b78d1946d3e1760941d6544))
+
+
+
+## [4.0.1-rc3](https://github.com/socketio/socket.io-parser/compare/4.0.1-rc2...4.0.1-rc3) (2020-10-25)
+
+
+
+## [4.0.1-rc2](https://github.com/socketio/socket.io-parser/compare/4.0.1-rc1...4.0.1-rc2) (2020-10-15)
+
+
+### Features
+
+* move binary detection back to the parser ([285e7cd](https://github.com/socketio/socket.io-parser/commit/285e7cd0d837adfc911c999e7294788681226ae1))
+
+
+
+## [4.0.1-rc1](https://github.com/socketio/socket.io-parser/compare/4.0.0...4.0.1-rc1) (2020-10-12)
+
+
+### Features
+
+* add support for a payload in a CONNECT packet ([78f9fc2](https://github.com/socketio/socket.io-parser/commit/78f9fc2999b15804b02f2c22a2b4007734a26af9))
+
+
+
+## [3.3.1](https://github.com/socketio/socket.io-parser/compare/3.3.0...3.3.1) (2020-09-30)
+
+
+## [4.0.0](https://github.com/socketio/socket.io-parser/compare/3.4.1...4.0.0) (2020-09-28)
+
+This release will be included in Socket.IO v3.
+
+There is a breaking API change (see below), but the exchange [protocol](https://github.com/socketio/socket.io-protocol) is left untouched and thus stays in version 4.
+
+### Bug Fixes
+
+* do not catch encoding errors ([aeae87c](https://github.com/socketio/socket.io-parser/commit/aeae87c220287197cb78370dbd86b950a7dd29eb))
+* throw upon invalid payload format ([c327acb](https://github.com/socketio/socket.io-parser/commit/c327acbc3c3c2d0b2b439136cbcb56c81db173d6))
+
+
+### BREAKING CHANGES
+
+* the encode method is now synchronous ([28d4f03](https://github.com/socketio/socket.io-parser/commit/28d4f0309bdd9e306b78d1946d3e1760941d6544))
+
+
+
 ## [3.4.1](https://github.com/socketio/socket.io-parser/compare/3.4.0...3.4.1) (2020-05-13)
 
 
 ### Bug Fixes
 
 * prevent DoS (OOM) via massive packets ([#95](https://github.com/socketio/socket.io-parser/issues/95)) ([dcb942d](https://github.com/socketio/socket.io-parser/commit/dcb942d24db97162ad16a67c2a0cf30875342d55))
+
+
+
+## [3.4.0](https://github.com/socketio/socket.io-parser/compare/3.3.0...3.4.0) (2019-09-20)
+
+
+
+## [3.3.0](https://github.com/socketio/socket.io-parser/compare/3.2.0...3.3.0) (2018-11-07)
+
+
+### Bug Fixes
+
+* remove any reference to the `global` variable ([b47efb2](https://github.com/socketio/socket.io-parser/commit/b47efb2))

Makefile

@@ -1,14 +0,0 @@
-
-help: ## print this message
-	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'
-
-test: ## run tests either in the browser or in Node.js, based on the `BROWSERS` variable
-	@if [ "x$(BROWSERS)" = "x" ]; then make test-node; else make test-zuul; fi
-
-test-node: ## run tests in Node.js
-	@./node_modules/.bin/mocha --reporter dot --bail test/index.js
-
-test-zuul: ## run tests in the browser
-	@./node_modules/zuul/bin/zuul test/index.js
-
-.PHONY: help test test-node test-zuul

Readme.md

@@ -1,14 +1,22 @@
 
 # socket.io-parser
 
-[![Build Status](https://secure.travis-ci.org/socketio/socket.io-parser.svg?branch=master)](http://travis-ci.org/socketio/socket.io-parser)
+[![Build Status](https://github.com/socketio/socket.io-parser/workflows/CI/badge.svg)](https://github.com/socketio/socket.io-parser/actions)
 [![NPM version](https://badge.fury.io/js/socket.io-parser.svg)](http://badge.fury.io/js/socket.io-parser)
 
-A socket.io encoder and decoder written in JavaScript complying with version `4`
+A socket.io encoder and decoder written in JavaScript complying with version `5`
 of [socket.io-protocol](https://github.com/socketio/socket.io-protocol).
 Used by [socket.io](https://github.com/automattic/socket.io) and
 [socket.io-client](https://github.com/automattic/socket.io-client).
 
+Compatibility table:
+
+| Parser version | Socket.IO server version | Protocol revision |
+|----------------| ------------------------ | ----------------- |
+| 3.x            | 1.x / 2.x                | 4                 |
+| 4.x            | 3.x                      | 5                 |
+
+
 ## Parser API
 
   socket.io-parser is the reference implementation of socket.io-protocol. Read
@@ -48,7 +56,7 @@ var parser = require('socket.io-parser');
 var encoder = new parser.Encoder();
 var packet = {
   type: parser.BINARY_EVENT,
-  data: {i: new Buffer(1234), j: new Blob([new ArrayBuffer(2)])}
+  data: {i: new Buffer(1234), j: new Blob([new ArrayBuffer(2)])},
   id: 15
 };
 encoder.encode(packet, function(encodedPackets) {

babel.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  presets: [["@babel/preset-env"]],
+};

bench/bench.js

@@ -1,10 +0,0 @@
-var bencher = require('./index');
-bencher(function(benchmark) {
-  function logMean(test) {
-    console.log(test.name + ' mean run time: ' + test.stats.mean);
-  }
-
-  for (var i = 0; i < benchmark.length; i++) {
-    logMean(benchmark[i]);
-  }
-});

bench/index.js

@@ -1,20 +1,21 @@
-var Benchmark = require('benchmark');
-var parser = require('../index');
+const Benchmark = require('benchmark');
+const parser = require('..');
 
 function test(packet, deferred) {
-  var encoder = new parser.Encoder();
-  var decoder = new parser.Decoder();
-  encoder.encode(packet, function(encodedPackets) {
-    var decoder = new parser.Decoder();
-    decoder.on('decoded', function(packet) {
+  const encoder = new parser.Encoder();
+  encoder.encode(packet, encodedPackets => {
+    const decoder = new parser.Decoder();
+    decoder.on('decoded', packet => {
       deferred.resolve();
     });
 
-    decoder.add(encodedPackets[0]);
+    for (const encodedPacket of encodedPackets) {
+      decoder.add(encodedPacket);
+    }
   });
 }
 
-var dataObject = {
+const dataObject = [{
   'a': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17],
   'b': 'xxxyyyzzzalsdfalskdjfalksdjfalksdjfalksdjfjjfjfjfjjfjfjfj',
   'data': {
@@ -25,57 +26,54 @@ var dataObject = {
       }
     }
    }
-};
-var bigArray = [];
-for (var i = 0; i < 250; i++) {
+}];
+const bigArray = [];
+for (let i = 0; i < 250; i++) {
   bigArray.push(dataObject);
 }
 
+const suite = new Benchmark.Suite();
 
-
-module.exports = function(callback) {
-  var suite = new Benchmark.Suite();
-
-  suite.add('small json parse', {defer: true, fn: function(deferred) {
-    var packet = {
+suite
+  .add('small json parse', {defer: true, fn: deferred => {
+    const packet = {
       type: parser.EVENT,
       nsp: '/bench',
       data: dataObject
     };
     test(packet, deferred);
   }})
-  .add('big json parse', {defer: true, fn: function(deferred) {
-    var packet = {
+  .add('big json parse', {defer: true, fn: deferred => {
+    const packet = {
       type: parser.EVENT,
       nsp: '/bench',
       data: bigArray
     };
     test(packet, deferred);
   }})
-  .add('json with small binary parse', {defer: true, fn: function(deferred) {
-    var packet = {
-      type: parser.EVENT,
+  .add('json with small binary parse', {defer: true, fn: deferred => {
+    const packet = {
+      type: parser.BINARY_EVENT,
       nsp: '/bench',
-      data: {'a': [1, 2, 3], 'b': 'xxxyyyzzz', 'data': new Buffer(1000)}
+      data: [{'a': [1, 2, 3], 'b': 'xxxyyyzzz', 'data': Buffer.allocUnsafe(1000)}]
     };
     test(packet, deferred);
   }})
-  .add('json with big binary parse', {defer: true, fn: function(deferred) {
-    var bigBinaryData = {
-      bin1: new Buffer(10000),
+  .add('json with big binary parse', {defer: true, fn: deferred => {
+    const bigBinaryData = [{
+      bin1: Buffer.allocUnsafe(10000),
       arr: bigArray,
-      bin2: new Buffer(10000),
-      bin3: new Buffer(10000)
-    };
-    var packet = {
-      type: parser.EVENT,
+      bin2: Buffer.allocUnsafe(10000),
+      bin3: Buffer.allocUnsafe(10000)
+    }];
+    const packet = {
+      type: parser.BINARY_EVENT,
       nsp: '/bench',
       data: bigBinaryData
     };
     test(packet, deferred);
   }})
-  .on('complete', function() {
-    callback(this);
+  .on('cycle', function(event) {
+    console.log(String(event.target));
   })
   .run({'async': true});
-};

bench/results.md

@@ -0,0 +1,4 @@
+small json parse                x 67,893 ops/sec ±4.30% (76 runs sampled)
+big json parse                  x  1,507 ops/sec ±1.72% (82 runs sampled)
+json with small binary parse    x 62,367 ops/sec ±6.03% (74 runs sampled)
+json with big binary parse      x    572 ops/sec ±1.25% (86 runs sampled)

binary.js

@@ -1,149 +0,0 @@
-/*global Blob,File*/
-
-/**
- * Module requirements
- */
-
-var isArray = require('isarray');
-var isBuf = require('./is-buffer');
-var toString = Object.prototype.toString;
-var withNativeBlob = typeof Blob === 'function' || (typeof Blob !== 'undefined' && toString.call(Blob) === '[object BlobConstructor]');
-var withNativeFile = typeof File === 'function' || (typeof File !== 'undefined' && toString.call(File) === '[object FileConstructor]');
-
-/**
- * Replaces every Buffer | ArrayBuffer in packet with a numbered placeholder.
- * Anything with blobs or files should be fed through removeBlobs before coming
- * here.
- *
- * @param {Object} packet - socket.io event packet
- * @return {Object} with deconstructed packet and list of buffers
- * @api public
- */
-
-exports.deconstructPacket = function(packet) {
-  var buffers = [];
-  var packetData = packet.data;
-  var pack = packet;
-  pack.data = _deconstructPacket(packetData, buffers);
-  pack.attachments = buffers.length; // number of binary 'attachments'
-  return {packet: pack, buffers: buffers};
-};
-
-function _deconstructPacket(data, buffers) {
-  if (!data) return data;
-
-  if (isBuf(data)) {
-    var placeholder = { _placeholder: true, num: buffers.length };
-    buffers.push(data);
-    return placeholder;
-  } else if (isArray(data)) {
-    var newData = new Array(data.length);
-    for (var i = 0; i < data.length; i++) {
-      newData[i] = _deconstructPacket(data[i], buffers);
-    }
-    return newData;
-  } else if (typeof data === 'object' && !(data instanceof Date)) {
-    var newData = {};
-    for (var key in data) {
-      newData[key] = _deconstructPacket(data[key], buffers);
-    }
-    return newData;
-  }
-  return data;
-}
-
-/**
- * Reconstructs a binary packet from its placeholder packet and buffers
- *
- * @param {Object} packet - event packet with placeholders
- * @param {Array} buffers - binary buffers to put in placeholder positions
- * @return {Object} reconstructed packet
- * @api public
- */
-
-exports.reconstructPacket = function(packet, buffers) {
-  packet.data = _reconstructPacket(packet.data, buffers);
-  packet.attachments = undefined; // no longer useful
-  return packet;
-};
-
-function _reconstructPacket(data, buffers) {
-  if (!data) return data;
-
-  if (data && data._placeholder === true) {
-    var isIndexValid =
-      typeof data.num === "number" &&
-      data.num >= 0 &&
-      data.num < buffers.length;
-    if (isIndexValid) {
-      return buffers[data.num]; // appropriate buffer (should be natural order anyway)
-    } else {
-      throw new Error("illegal attachments");
-    }
-  } else if (isArray(data)) {
-    for (var i = 0; i < data.length; i++) {
-      data[i] = _reconstructPacket(data[i], buffers);
-    }
-  } else if (typeof data === 'object') {
-    for (var key in data) {
-      data[key] = _reconstructPacket(data[key], buffers);
-    }
-  }
-
-  return data;
-}
-
-/**
- * Asynchronously removes Blobs or Files from data via
- * FileReader's readAsArrayBuffer method. Used before encoding
- * data as msgpack. Calls callback with the blobless data.
- *
- * @param {Object} data
- * @param {Function} callback
- * @api private
- */
-
-exports.removeBlobs = function(data, callback) {
-  function _removeBlobs(obj, curKey, containingObject) {
-    if (!obj) return obj;
-
-    // convert any blob
-    if ((withNativeBlob && obj instanceof Blob) ||
-        (withNativeFile && obj instanceof File)) {
-      pendingBlobs++;
-
-      // async filereader
-      var fileReader = new FileReader();
-      fileReader.onload = function() { // this.result == arraybuffer
-        if (containingObject) {
-          containingObject[curKey] = this.result;
-        }
-        else {
-          bloblessData = this.result;
-        }
-
-        // if nothing pending its callback time
-        if(! --pendingBlobs) {
-          callback(bloblessData);
-        }
-      };
-
-      fileReader.readAsArrayBuffer(obj); // blob -> arraybuffer
-    } else if (isArray(obj)) { // handle array
-      for (var i = 0; i < obj.length; i++) {
-        _removeBlobs(obj[i], i, obj);
-      }
-    } else if (typeof obj === 'object' && !isBuf(obj)) { // and object
-      for (var key in obj) {
-        _removeBlobs(obj[key], key, obj);
-      }
-    }
-  }
-
-  var pendingBlobs = 0;
-  var bloblessData = data;
-  _removeBlobs(bloblessData);
-  if (!pendingBlobs) {
-    callback(bloblessData);
-  }
-};

index.js

@@ -1,455 +0,0 @@
-
-/**
- * Module dependencies.
- */
-
-var debug = require('debug')('socket.io-parser');
-var Emitter = require('component-emitter');
-var binary = require('./binary');
-var isArray = require('isarray');
-var isBuf = require('./is-buffer');
-
-/**
- * Protocol version.
- *
- * @api public
- */
-
-exports.protocol = 4;
-
-/**
- * Packet types.
- *
- * @api public
- */
-
-exports.types = [
-  'CONNECT',
-  'DISCONNECT',
-  'EVENT',
-  'ACK',
-  'ERROR',
-  'BINARY_EVENT',
-  'BINARY_ACK'
-];
-
-/**
- * Packet type `connect`.
- *
- * @api public
- */
-
-exports.CONNECT = 0;
-
-/**
- * Packet type `disconnect`.
- *
- * @api public
- */
-
-exports.DISCONNECT = 1;
-
-/**
- * Packet type `event`.
- *
- * @api public
- */
-
-exports.EVENT = 2;
-
-/**
- * Packet type `ack`.
- *
- * @api public
- */
-
-exports.ACK = 3;
-
-/**
- * Packet type `error`.
- *
- * @api public
- */
-
-exports.ERROR = 4;
-
-/**
- * Packet type 'binary event'
- *
- * @api public
- */
-
-exports.BINARY_EVENT = 5;
-
-/**
- * Packet type `binary ack`. For acks with binary arguments.
- *
- * @api public
- */
-
-exports.BINARY_ACK = 6;
-
-/**
- * Encoder constructor.
- *
- * @api public
- */
-
-exports.Encoder = Encoder;
-
-/**
- * Decoder constructor.
- *
- * @api public
- */
-
-exports.Decoder = Decoder;
-
-/**
- * A socket.io Encoder instance
- *
- * @api public
- */
-
-function Encoder() {}
-
-var ERROR_PACKET = exports.ERROR + '"encode error"';
-
-/**
- * Encode a packet as a single string if non-binary, or as a
- * buffer sequence, depending on packet type.
- *
- * @param {Object} obj - packet object
- * @param {Function} callback - function to handle encodings (likely engine.write)
- * @return Calls callback with Array of encodings
- * @api public
- */
-
-Encoder.prototype.encode = function(obj, callback){
-  debug('encoding packet %j', obj);
-
-  if (exports.BINARY_EVENT === obj.type || exports.BINARY_ACK === obj.type) {
-    encodeAsBinary(obj, callback);
-  } else {
-    var encoding = encodeAsString(obj);
-    callback([encoding]);
-  }
-};
-
-/**
- * Encode packet as string.
- *
- * @param {Object} packet
- * @return {String} encoded
- * @api private
- */
-
-function encodeAsString(obj) {
-
-  // first is type
-  var str = '' + obj.type;
-
-  // attachments if we have them
-  if (exports.BINARY_EVENT === obj.type || exports.BINARY_ACK === obj.type) {
-    str += obj.attachments + '-';
-  }
-
-  // if we have a namespace other than `/`
-  // we append it followed by a comma `,`
-  if (obj.nsp && '/' !== obj.nsp) {
-    str += obj.nsp + ',';
-  }
-
-  // immediately followed by the id
-  if (null != obj.id) {
-    str += obj.id;
-  }
-
-  // json data
-  if (null != obj.data) {
-    var payload = tryStringify(obj.data);
-    if (payload !== false) {
-      str += payload;
-    } else {
-      return ERROR_PACKET;
-    }
-  }
-
-  debug('encoded %j as %s', obj, str);
-  return str;
-}
-
-function tryStringify(str) {
-  try {
-    return JSON.stringify(str);
-  } catch(e){
-    return false;
-  }
-}
-
-/**
- * Encode packet as 'buffer sequence' by removing blobs, and
- * deconstructing packet into object with placeholders and
- * a list of buffers.
- *
- * @param {Object} packet
- * @return {Buffer} encoded
- * @api private
- */
-
-function encodeAsBinary(obj, callback) {
-
-  function writeEncoding(bloblessData) {
-    var deconstruction = binary.deconstructPacket(bloblessData);
-    var pack = encodeAsString(deconstruction.packet);
-    var buffers = deconstruction.buffers;
-
-    buffers.unshift(pack); // add packet info to beginning of data list
-    callback(buffers); // write all the buffers
-  }
-
-  binary.removeBlobs(obj, writeEncoding);
-}
-
-/**
- * A socket.io Decoder instance
- *
- * @return {Object} decoder
- * @api public
- */
-
-function Decoder(opts) {
-  this.reconstructor = null;
-  opts = opts || {};
-  this.opts = {
-    maxAttachments: opts.maxAttachments || 10,
-  };
-}
-
-/**
- * Mix in `Emitter` with Decoder.
- */
-
-Emitter(Decoder.prototype);
-
-/**
- * Decodes an encoded packet string into packet JSON.
- *
- * @param {String} obj - encoded packet
- * @return {Object} packet
- * @api public
- */
-
-Decoder.prototype.add = function(obj) {
-  var packet;
-  if (typeof obj === 'string') {
-    if (this.reconstructor) {
-      throw new Error("got plaintext data when reconstructing a packet");
-    }
-    packet = decodeString(obj, this.opts.maxAttachments);
-    if (exports.BINARY_EVENT === packet.type || exports.BINARY_ACK === packet.type) { // binary packet's json
-      this.reconstructor = new BinaryReconstructor(packet);
-
-      // no attachments, labeled binary but no binary data to follow
-      if (this.reconstructor.reconPack.attachments === 0) {
-        this.emit('decoded', packet);
-      }
-    } else { // non-binary full packet
-      this.emit('decoded', packet);
-    }
-  } else if (isBuf(obj) || obj.base64) { // raw binary data
-    if (!this.reconstructor) {
-      throw new Error('got binary data when not reconstructing a packet');
-    } else {
-      packet = this.reconstructor.takeBinaryData(obj);
-      if (packet) { // received final buffer
-        this.reconstructor = null;
-        this.emit('decoded', packet);
-      }
-    }
-  } else {
-    throw new Error('Unknown type: ' + obj);
-  }
-};
-
-/**
- * Decode a packet String (JSON data)
- *
- * @param {String} str
- * @param {Number} maxAttachments - the maximum number of binary attachments
- * @return {Object} packet
- * @api private
- */
-
-function decodeString(str, maxAttachments) {
-  var i = 0;
-  // look up type
-  var p = {
-    type: Number(str.charAt(0))
-  };
-
-  if (null == exports.types[p.type]) {
-    return error('unknown packet type ' + p.type);
-  }
-
-  // look up attachments if type binary
-  if (exports.BINARY_EVENT === p.type || exports.BINARY_ACK === p.type) {
-    var start = i + 1;
-    while (str.charAt(++i) !== '-' && i != str.length) {}
-    var buf = str.substring(start, i);
-    if (buf != Number(buf) || str.charAt(i) !== '-') {
-      throw new Error('Illegal attachments');
-    }
-    var n = Number(buf);
-    if (!isInteger(n) || n < 0) {
-      throw new Error("Illegal attachments");
-    } else if (n > maxAttachments) {
-      throw new Error("too many attachments");
-    }
-    p.attachments = n;
-  }
-
-  // look up namespace (if any)
-  if ('/' === str.charAt(i + 1)) {
-    var start = i + 1;
-    while (++i) {
-      var c = str.charAt(i);
-      if (',' === c) break;
-      if (i === str.length) break;
-    }
-    p.nsp = str.substring(start, i);
-  } else {
-    p.nsp = '/';
-  }
-
-  // look up id
-  var next = str.charAt(i + 1);
-  if ('' !== next && Number(next) == next) {
-    var start = i + 1;
-    while (++i) {
-      var c = str.charAt(i);
-      if (null == c || Number(c) != c) {
-        --i;
-        break;
-      }
-      if (i === str.length) break;
-    }
-    p.id = Number(str.substring(start, i + 1));
-  }
-
-  // look up json data
-  if (str.charAt(++i)) {
-    var payload = tryParse(str.substr(i));
-    if (isPayloadValid(p.type, payload)) {
-      p.data = payload;
-    } else {
-      throw new Error("invalid payload");
-    }
-  }
-
-  debug('decoded %s as %j', str, p);
-  return p;
-}
-
-function tryParse(str) {
-  try {
-    return JSON.parse(str);
-  } catch(e){
-    return false;
-  }
-}
-
-function isPayloadValid(type, payload) {
-  switch (type) {
-    case 0: // CONNECT
-      return typeof payload === "object";
-    case 1: // DISCONNECT
-      return payload === undefined;
-    case 4: // ERROR
-      return typeof payload === "string" || typeof payload === "object";
-    case 2: // EVENT
-    case 5: // BINARY_EVENT
-      return (
-        isArray(payload) &&
-        (typeof payload[0] === "string" || typeof payload[0] === "number")
-      );
-    case 3: // ACK
-    case 6: // BINARY_ACK
-      return isArray(payload);
-  }
-}
-
-/**
- * Deallocates a parser's resources
- *
- * @api public
- */
-
-Decoder.prototype.destroy = function() {
-  if (this.reconstructor) {
-    this.reconstructor.finishedReconstruction();
-  }
-};
-
-/**
- * A manager of a binary event's 'buffer sequence'. Should
- * be constructed whenever a packet of type BINARY_EVENT is
- * decoded.
- *
- * @param {Object} packet
- * @return {BinaryReconstructor} initialized reconstructor
- * @api private
- */
-
-function BinaryReconstructor(packet) {
-  this.reconPack = packet;
-  this.buffers = [];
-}
-
-/**
- * Method to be called when binary data received from connection
- * after a BINARY_EVENT packet.
- *
- * @param {Buffer | ArrayBuffer} binData - the raw binary data received
- * @return {null | Object} returns null if more binary data is expected or
- *   a reconstructed packet object if all buffers have been received.
- * @api private
- */
-
-BinaryReconstructor.prototype.takeBinaryData = function(binData) {
-  this.buffers.push(binData);
-  if (this.buffers.length === this.reconPack.attachments) { // done with buffer list
-    var packet = binary.reconstructPacket(this.reconPack, this.buffers);
-    this.finishedReconstruction();
-    return packet;
-  }
-  return null;
-};
-
-/**
- * Cleans up binary packet reconstruction variables.
- *
- * @api private
- */
-
-BinaryReconstructor.prototype.finishedReconstruction = function() {
-  this.reconPack = null;
-  this.buffers = [];
-};
-
-function error(msg) {
-  return {
-    type: exports.ERROR,
-    data: 'parser error: ' + msg
-  };
-}
-
-var isInteger =
-  Number.isInteger ||
-  function (value) {
-    return (
-      typeof value === "number" &&
-      isFinite(value) &&
-      Math.floor(value) === value
-    );
-  };

is-buffer.js

@@ -1,20 +0,0 @@
-
-module.exports = isBuf;
-
-var withNativeBuffer = typeof Buffer === 'function' && typeof Buffer.isBuffer === 'function';
-var withNativeArrayBuffer = typeof ArrayBuffer === 'function';
-
-var isView = function (obj) {
-  return typeof ArrayBuffer.isView === 'function' ? ArrayBuffer.isView(obj) : (obj.buffer instanceof ArrayBuffer);
-};
-
-/**
- * Returns true if obj is a buffer or an arraybuffer.
- *
- * @api private
- */
-
-function isBuf(obj) {
-  return (withNativeBuffer && Buffer.isBuffer(obj)) ||
-          (withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj)));
-}

lib/binary.ts

@@ -0,0 +1,86 @@
+import { isBinary } from "./is-binary.js";
+
+/**
+ * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.
+ *
+ * @param {Object} packet - socket.io event packet
+ * @return {Object} with deconstructed packet and list of buffers
+ * @public
+ */
+
+export function deconstructPacket(packet) {
+  const buffers = [];
+  const packetData = packet.data;
+  const pack = packet;
+  pack.data = _deconstructPacket(packetData, buffers);
+  pack.attachments = buffers.length; // number of binary 'attachments'
+  return { packet: pack, buffers: buffers };
+}
+
+function _deconstructPacket(data, buffers) {
+  if (!data) return data;
+
+  if (isBinary(data)) {
+    const placeholder = { _placeholder: true, num: buffers.length };
+    buffers.push(data);
+    return placeholder;
+  } else if (Array.isArray(data)) {
+    const newData = new Array(data.length);
+    for (let i = 0; i < data.length; i++) {
+      newData[i] = _deconstructPacket(data[i], buffers);
+    }
+    return newData;
+  } else if (typeof data === "object" && !(data instanceof Date)) {
+    const newData = {};
+    for (const key in data) {
+      if (Object.prototype.hasOwnProperty.call(data, key)) {
+        newData[key] = _deconstructPacket(data[key], buffers);
+      }
+    }
+    return newData;
+  }
+  return data;
+}
+
+/**
+ * Reconstructs a binary packet from its placeholder packet and buffers
+ *
+ * @param {Object} packet - event packet with placeholders
+ * @param {Array} buffers - binary buffers to put in placeholder positions
+ * @return {Object} reconstructed packet
+ * @public
+ */
+
+export function reconstructPacket(packet, buffers) {
+  packet.data = _reconstructPacket(packet.data, buffers);
+  delete packet.attachments; // no longer useful
+  return packet;
+}
+
+function _reconstructPacket(data, buffers) {
+  if (!data) return data;
+
+  if (data && data._placeholder === true) {
+    const isIndexValid =
+      typeof data.num === "number" &&
+      data.num >= 0 &&
+      data.num < buffers.length;
+    if (isIndexValid) {
+      return buffers[data.num]; // appropriate buffer (should be natural order anyway)
+    } else {
+      throw new Error("illegal attachments");
+    }
+  } else if (Array.isArray(data)) {
+    for (let i = 0; i < data.length; i++) {
+      data[i] = _reconstructPacket(data[i], buffers);
+    }
+  } else if (typeof data === "object") {
+    for (const key in data) {
+      if (Object.prototype.hasOwnProperty.call(data, key)) {
+        data[key] = _reconstructPacket(data[key], buffers);
+      }
+    }
+  }
+
+  return data;
+}

lib/index.ts

@@ -0,0 +1,361 @@
+import { Emitter } from "@socket.io/component-emitter";
+import { deconstructPacket, reconstructPacket } from "./binary.js";
+import { isBinary, hasBinary } from "./is-binary.js";
+import debugModule from "debug"; // debug()
+
+const debug = debugModule("socket.io-parser"); // debug()
+
+/**
+ * These strings must not be used as event names, as they have a special meaning.
+ */
+const RESERVED_EVENTS = [
+  "connect", // used on the client side
+  "connect_error", // used on the client side
+  "disconnect", // used on both sides
+  "disconnecting", // used on the server side
+  "newListener", // used by the Node.js EventEmitter
+  "removeListener", // used by the Node.js EventEmitter
+];
+
+/**
+ * Protocol version.
+ *
+ * @public
+ */
+
+export const protocol: number = 5;
+
+export enum PacketType {
+  CONNECT,
+  DISCONNECT,
+  EVENT,
+  ACK,
+  CONNECT_ERROR,
+  BINARY_EVENT,
+  BINARY_ACK,
+}
+
+export interface Packet {
+  type: PacketType;
+  nsp: string;
+  data?: any;
+  id?: number;
+  attachments?: number;
+}
+
+/**
+ * A socket.io Encoder instance
+ */
+
+export class Encoder {
+  /**
+   * Encoder constructor
+   *
+   * @param {function} replacer - custom replacer to pass down to JSON.parse
+   */
+  constructor(private replacer?: (this: any, key: string, value: any) => any) {}
+  /**
+   * Encode a packet as a single string if non-binary, or as a
+   * buffer sequence, depending on packet type.
+   *
+   * @param {Object} obj - packet object
+   */
+  public encode(obj: Packet) {
+    debug("encoding packet %j", obj);
+
+    if (obj.type === PacketType.EVENT || obj.type === PacketType.ACK) {
+      if (hasBinary(obj)) {
+        return this.encodeAsBinary({
+          type:
+            obj.type === PacketType.EVENT
+              ? PacketType.BINARY_EVENT
+              : PacketType.BINARY_ACK,
+          nsp: obj.nsp,
+          data: obj.data,
+          id: obj.id,
+        });
+      }
+    }
+    return [this.encodeAsString(obj)];
+  }
+
+  /**
+   * Encode packet as string.
+   */
+
+  private encodeAsString(obj: Packet) {
+    // first is type
+    let str = "" + obj.type;
+
+    // attachments if we have them
+    if (
+      obj.type === PacketType.BINARY_EVENT ||
+      obj.type === PacketType.BINARY_ACK
+    ) {
+      str += obj.attachments + "-";
+    }
+
+    // if we have a namespace other than `/`
+    // we append it followed by a comma `,`
+    if (obj.nsp && "/" !== obj.nsp) {
+      str += obj.nsp + ",";
+    }
+
+    // immediately followed by the id
+    if (null != obj.id) {
+      str += obj.id;
+    }
+
+    // json data
+    if (null != obj.data) {
+      str += JSON.stringify(obj.data, this.replacer);
+    }
+
+    debug("encoded %j as %s", obj, str);
+    return str;
+  }
+
+  /**
+   * Encode packet as 'buffer sequence' by removing blobs, and
+   * deconstructing packet into object with placeholders and
+   * a list of buffers.
+   */
+
+  private encodeAsBinary(obj: Packet) {
+    const deconstruction = deconstructPacket(obj);
+    const pack = this.encodeAsString(deconstruction.packet);
+    const buffers = deconstruction.buffers;
+
+    buffers.unshift(pack); // add packet info to beginning of data list
+    return buffers; // write all the buffers
+  }
+}
+
+// see https://stackoverflow.com/questions/8511281/check-if-a-value-is-an-object-in-javascript
+function isObject(value: any): boolean {
+  return Object.prototype.toString.call(value) === "[object Object]";
+}
+
+interface DecoderReservedEvents {
+  decoded: (packet: Packet) => void;
+}
+
+/**
+ * A socket.io Decoder instance
+ *
+ * @return {Object} decoder
+ */
+export class Decoder extends Emitter<{}, {}, DecoderReservedEvents> {
+  private reconstructor: BinaryReconstructor;
+
+  /**
+   * Decoder constructor
+   *
+   * @param {function} reviver - custom reviver to pass down to JSON.stringify
+   */
+  constructor(private reviver?: (this: any, key: string, value: any) => any) {
+    super();
+  }
+
+  /**
+   * Decodes an encoded packet string into packet JSON.
+   *
+   * @param {String} obj - encoded packet
+   */
+
+  public add(obj: any) {
+    let packet;
+    if (typeof obj === "string") {
+      if (this.reconstructor) {
+        throw new Error("got plaintext data when reconstructing a packet");
+      }
+      packet = this.decodeString(obj);
+      const isBinaryEvent = packet.type === PacketType.BINARY_EVENT;
+      if (isBinaryEvent || packet.type === PacketType.BINARY_ACK) {
+        packet.type = isBinaryEvent ? PacketType.EVENT : PacketType.ACK;
+        // binary packet's json
+        this.reconstructor = new BinaryReconstructor(packet);
+
+        // no attachments, labeled binary but no binary data to follow
+        if (packet.attachments === 0) {
+          super.emitReserved("decoded", packet);
+        }
+      } else {
+        // non-binary full packet
+        super.emitReserved("decoded", packet);
+      }
+    } else if (isBinary(obj) || obj.base64) {
+      // raw binary data
+      if (!this.reconstructor) {
+        throw new Error("got binary data when not reconstructing a packet");
+      } else {
+        packet = this.reconstructor.takeBinaryData(obj);
+        if (packet) {
+          // received final buffer
+          this.reconstructor = null;
+          super.emitReserved("decoded", packet);
+        }
+      }
+    } else {
+      throw new Error("Unknown type: " + obj);
+    }
+  }
+
+  /**
+   * Decode a packet String (JSON data)
+   *
+   * @param {String} str
+   * @return {Object} packet
+   */
+  private decodeString(str): Packet {
+    let i = 0;
+    // look up type
+    const p: any = {
+      type: Number(str.charAt(0)),
+    };
+
+    if (PacketType[p.type] === undefined) {
+      throw new Error("unknown packet type " + p.type);
+    }
+
+    // look up attachments if type binary
+    if (
+      p.type === PacketType.BINARY_EVENT ||
+      p.type === PacketType.BINARY_ACK
+    ) {
+      const start = i + 1;
+      while (str.charAt(++i) !== "-" && i != str.length) {}
+      const buf = str.substring(start, i);
+      if (buf != Number(buf) || str.charAt(i) !== "-") {
+        throw new Error("Illegal attachments");
+      }
+      p.attachments = Number(buf);
+    }
+
+    // look up namespace (if any)
+    if ("/" === str.charAt(i + 1)) {
+      const start = i + 1;
+      while (++i) {
+        const c = str.charAt(i);
+        if ("," === c) break;
+        if (i === str.length) break;
+      }
+      p.nsp = str.substring(start, i);
+    } else {
+      p.nsp = "/";
+    }
+
+    // look up id
+    const next = str.charAt(i + 1);
+    if ("" !== next && Number(next) == next) {
+      const start = i + 1;
+      while (++i) {
+        const c = str.charAt(i);
+        if (null == c || Number(c) != c) {
+          --i;
+          break;
+        }
+        if (i === str.length) break;
+      }
+      p.id = Number(str.substring(start, i + 1));
+    }
+
+    // look up json data
+    if (str.charAt(++i)) {
+      const payload = this.tryParse(str.substr(i));
+      if (Decoder.isPayloadValid(p.type, payload)) {
+        p.data = payload;
+      } else {
+        throw new Error("invalid payload");
+      }
+    }
+
+    debug("decoded %s as %j", str, p);
+    return p;
+  }
+
+  private tryParse(str) {
+    try {
+      return JSON.parse(str, this.reviver);
+    } catch (e) {
+      return false;
+    }
+  }
+
+  private static isPayloadValid(type: PacketType, payload: any): boolean {
+    switch (type) {
+      case PacketType.CONNECT:
+        return isObject(payload);
+      case PacketType.DISCONNECT:
+        return payload === undefined;
+      case PacketType.CONNECT_ERROR:
+        return typeof payload === "string" || isObject(payload);
+      case PacketType.EVENT:
+      case PacketType.BINARY_EVENT:
+        return (
+          Array.isArray(payload) &&
+          (typeof payload[0] === "number" ||
+            (typeof payload[0] === "string" &&
+              RESERVED_EVENTS.indexOf(payload[0]) === -1))
+        );
+      case PacketType.ACK:
+      case PacketType.BINARY_ACK:
+        return Array.isArray(payload);
+    }
+  }
+
+  /**
+   * Deallocates a parser's resources
+   */
+  public destroy() {
+    if (this.reconstructor) {
+      this.reconstructor.finishedReconstruction();
+      this.reconstructor = null;
+    }
+  }
+}
+
+/**
+ * A manager of a binary event's 'buffer sequence'. Should
+ * be constructed whenever a packet of type BINARY_EVENT is
+ * decoded.
+ *
+ * @param {Object} packet
+ * @return {BinaryReconstructor} initialized reconstructor
+ */
+
+class BinaryReconstructor {
+  private reconPack;
+  private buffers: Array<Buffer | ArrayBuffer> = [];
+
+  constructor(readonly packet: Packet) {
+    this.reconPack = packet;
+  }
+
+  /**
+   * Method to be called when binary data received from connection
+   * after a BINARY_EVENT packet.
+   *
+   * @param {Buffer | ArrayBuffer} binData - the raw binary data received
+   * @return {null | Object} returns null if more binary data is expected or
+   *   a reconstructed packet object if all buffers have been received.
+   */
+  public takeBinaryData(binData) {
+    this.buffers.push(binData);
+    if (this.buffers.length === this.reconPack.attachments) {
+      // done with buffer list
+      const packet = reconstructPacket(this.reconPack, this.buffers);
+      this.finishedReconstruction();
+      return packet;
+    }
+    return null;
+  }
+
+  /**
+   * Cleans up binary packet reconstruction variables.
+   */
+  public finishedReconstruction() {
+    this.reconPack = null;
+    this.buffers = [];
+  }
+}

lib/is-binary.ts

@@ -0,0 +1,66 @@
+const withNativeArrayBuffer: boolean = typeof ArrayBuffer === "function";
+
+const isView = (obj: any) => {
+  return typeof ArrayBuffer.isView === "function"
+    ? ArrayBuffer.isView(obj)
+    : obj.buffer instanceof ArrayBuffer;
+};
+
+const toString = Object.prototype.toString;
+const withNativeBlob =
+  typeof Blob === "function" ||
+  (typeof Blob !== "undefined" &&
+    toString.call(Blob) === "[object BlobConstructor]");
+const withNativeFile =
+  typeof File === "function" ||
+  (typeof File !== "undefined" &&
+    toString.call(File) === "[object FileConstructor]");
+
+/**
+ * Returns true if obj is a Buffer, an ArrayBuffer, a Blob or a File.
+ *
+ * @private
+ */
+
+export function isBinary(obj: any) {
+  return (
+    (withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj))) ||
+    (withNativeBlob && obj instanceof Blob) ||
+    (withNativeFile && obj instanceof File)
+  );
+}
+
+export function hasBinary(obj: any, toJSON?: boolean) {
+  if (!obj || typeof obj !== "object") {
+    return false;
+  }
+
+  if (Array.isArray(obj)) {
+    for (let i = 0, l = obj.length; i < l; i++) {
+      if (hasBinary(obj[i])) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  if (isBinary(obj)) {
+    return true;
+  }
+
+  if (
+    obj.toJSON &&
+    typeof obj.toJSON === "function" &&
+    arguments.length === 1
+  ) {
+    return hasBinary(obj.toJSON(), true);
+  }
+
+  for (const key in obj) {
+    if (Object.prototype.hasOwnProperty.call(obj, key) && hasBinary(obj[key])) {
+      return true;
+    }
+  }
+
+  return false;
+}

package.json

@@ -1,34 +1,55 @@
 {
   "name": "socket.io-parser",
-  "version": "3.4.4",
+  "version": "4.2.4",
   "description": "socket.io protocol parser",
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/socketio/socket.io.git"
+    "url": "https://github.com/socketio/socket.io-parser.git"
   },
   "files": [
-    "binary.js",
-    "index.js",
-    "is-buffer.js"
+    "build/"
   ],
+  "main": "./build/cjs/index.js",
+  "module": "./build/esm/index.js",
+  "types": "./build/esm/index.d.ts",
+  "exports": {
+    "import": {
+      "node": "./build/esm-debug/index.js",
+      "default": "./build/esm/index.js"
+    },
+    "require": "./build/cjs/index.js"
+  },
   "dependencies": {
-    "debug": "~4.1.0",
-    "component-emitter": "1.2.1",
-    "isarray": "2.0.1"
+    "@socket.io/component-emitter": "~3.1.0",
+    "debug": "~4.3.1"
   },
   "devDependencies": {
     "@babel/core": "~7.9.6",
     "@babel/preset-env": "~7.9.6",
-    "babelify": "~10.0.0",
+    "@babel/register": "^7.18.9",
+    "@types/debug": "^4.1.5",
+    "@types/node": "^14.11.1",
+    "@wdio/cli": "^7.26.0",
+    "@wdio/local-runner": "^7.26.0",
+    "@wdio/mocha-framework": "^7.26.0",
+    "@wdio/sauce-service": "^7.26.0",
+    "@wdio/spec-reporter": "^7.26.0",
     "benchmark": "2.1.2",
     "expect.js": "0.3.1",
-    "mocha": "3.2.0",
-    "socket.io-browsers": "^1.0.0",
-    "zuul": "3.11.1",
-    "zuul-ngrok": "4.0.0"
+    "mocha": "^10.1.0",
+    "prettier": "^2.1.2",
+    "rimraf": "^3.0.2",
+    "typescript": "^4.0.3",
+    "wdio-geckodriver-service": "^4.0.0"
   },
   "scripts": {
-    "test": "make test"
+    "compile": "rimraf ./build && tsc && tsc -p tsconfig.esm.json && ./postcompile.sh",
+    "test": "npm run format:check && npm run compile && if test \"$BROWSERS\" = \"1\" ; then npm run test:browser; else npm run test:node; fi",
+    "test:node": "mocha --reporter dot --bail test/index.js",
+    "test:browser": "wdio",
+    "format:fix": "prettier --write --parser typescript '*.js' 'lib/**/*.ts' 'test/**/*.js'",
+    "format:check": "prettier --check --parser typescript '*.js' 'lib/**/*.ts' 'test/**/*.js'",
+    "prepack": "npm run compile"
   },
   "license": "MIT",
   "engines": {

postcompile.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+cp ./support/package.cjs.json ./build/cjs/package.json
+cp ./support/package.esm.json ./build/esm/package.json
+
+cp -r ./build/esm/ ./build/esm-debug/
+
+sed -i '/debug(/d' ./build/esm/*.js

support/package.cjs.json

@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}

support/package.esm.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

test/arraybuffer.js

@@ -1,70 +1,87 @@
-var parser = require('../index.js');
-var expect = require('expect.js');
-var helpers = require('./helpers.js');
-var encoder = new parser.Encoder();
+const { PacketType, Decoder, Encoder } = require("..");
+const expect = require("expect.js");
+const helpers = require("./helpers.js");
+const encoder = new Encoder();
 
-describe('parser', function() {
-  it('encodes an ArrayBuffer', function() {
-    var packet = {
-      type: parser.BINARY_EVENT,
-      data: ['a', new ArrayBuffer(2)],
+describe("ArrayBuffer", () => {
+  it("encodes an ArrayBuffer", () => {
+    const packet = {
+      type: PacketType.EVENT,
+      data: ["a", new ArrayBuffer(2)],
       id: 0,
-      nsp: '/'
+      nsp: "/",
     };
-    helpers.test_bin(packet);
+    return helpers.test_bin(packet);
   });
 
-  it('encodes a TypedArray', function() {
-    var array = new Uint8Array(5);
-    for (var i = 0; i < array.length; i++) array[i] = i;
-
-    var packet = {
-      type: parser.BINARY_EVENT,
-      data: ['a', array],
+  it("encodes an ArrayBuffer into an object with a null prototype", () => {
+    const packet = {
+      type: PacketType.EVENT,
+      data: [
+        "a",
+        Object.create(null, {
+          array: { value: new ArrayBuffer(2), enumerable: true },
+        }),
+      ],
       id: 0,
-      nsp: '/'
+      nsp: "/",
     };
-    helpers.test_bin(packet);
+    return helpers.test_bin(packet);
   });
 
-  it('encodes ArrayBuffers deep in JSON', function() {
-    var packet = {
-      type: parser.BINARY_EVENT,
-      data: ['a', {a: 'hi', b: {why: new ArrayBuffer(3)}, c: {a: 'bye', b: { a: new ArrayBuffer(6)}}}],
+  it("encodes a TypedArray", () => {
+    const array = new Uint8Array(5);
+    for (let i = 0; i < array.length; i++) array[i] = i;
+
+    const packet = {
+      type: PacketType.EVENT,
+      data: ["a", array],
+      id: 0,
+      nsp: "/",
+    };
+    return helpers.test_bin(packet);
+  });
+
+  it("encodes ArrayBuffers deep in JSON", () => {
+    const packet = {
+      type: PacketType.EVENT,
+      data: [
+        "a",
+        {
+          a: "hi",
+          b: { why: new ArrayBuffer(3) },
+          c: { a: "bye", b: { a: new ArrayBuffer(6) } },
+        },
+      ],
       id: 999,
-      nsp: '/deep'
+      nsp: "/deep",
     };
-    helpers.test_bin(packet);
+    return helpers.test_bin(packet);
   });
 
-  it('encodes deep binary JSON with null values', function() {
-    var packet = {
-      type: parser.BINARY_EVENT,
-      data: ['a', {a: 'b', c: 4, e: {g: null}, h: new ArrayBuffer(9)}],
-      nsp: '/',
-      id: 600
+  it("encodes deep binary JSON with null values", () => {
+    const packet = {
+      type: PacketType.EVENT,
+      data: ["a", { a: "b", c: 4, e: { g: null }, h: new ArrayBuffer(9) }],
+      nsp: "/",
+      id: 600,
     };
-    helpers.test_bin(packet);
+    return helpers.test_bin(packet);
   });
 
-  it('cleans itself up on close', function() {
-    var packet = {
-      type: parser.BINARY_EVENT,
-      data: ["foo", new ArrayBuffer(2), new ArrayBuffer(3)],
-      id: 0,
-      nsp: '/'
+  it("should not modify the input packet", () => {
+    const packet = {
+      type: PacketType.EVENT,
+      nsp: "/",
+      data: ["a", Uint8Array.of(1, 2, 3), Uint8Array.of(4, 5, 6)],
     };
 
-    encoder.encode(packet, function(encodedPackets) {
-      var decoder = new parser.Decoder();
-      decoder.on('decoded', function(packet) {
-        throw new Error("received a packet when not all binary data was sent.");
-      });
+    encoder.encode(packet);
 
-      decoder.add(encodedPackets[0]); // add metadata
-      decoder.add(encodedPackets[1]); // add first attachment
-      decoder.destroy(); // destroy before all data added
-      expect(decoder.reconstructor.buffers.length).to.be(0); // expect that buffer is clean
+    expect(packet).to.eql({
+      type: PacketType.EVENT,
+      nsp: "/",
+      data: ["a", Uint8Array.of(1, 2, 3), Uint8Array.of(4, 5, 6)],
     });
   });
 });

test/blob.js

@@ -1,67 +1,72 @@
-var parser = require('../index.js');
-var helpers = require('./helpers.js');
+const { PacketType } = require("..");
+const helpers = require("./helpers.js");
 
-var BlobBuilder = typeof BlobBuilder !== 'undefined' ? BlobBuilder :
-                  typeof WebKitBlobBuilder !== 'undefined' ? WebKitBlobBuilder :
-                  typeof MSBlobBuilder !== 'undefined' ? MSBlobBuilder :
-                  typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder : false;
+const BlobBuilderImpl =
+  typeof BlobBuilder !== "undefined"
+    ? BlobBuilder
+    : typeof WebKitBlobBuilder !== "undefined"
+    ? WebKitBlobBuilder
+    : typeof MSBlobBuilder !== "undefined"
+    ? MSBlobBuilder
+    : typeof MozBlobBuilder !== "undefined"
+    ? MozBlobBuilder
+    : false;
 
-describe('parser', function() {
-  it('encodes a Blob', function() {
-    var data;
-    if (BlobBuilder) {
-      var bb = new BlobBuilder();
+describe("Blob", () => {
+  it("encodes a Blob", () => {
+    let data;
+    if (BlobBuilderImpl) {
+      const bb = new BlobBuilderImpl();
       bb.append(new ArrayBuffer(2));
       data = bb.getBlob();
     } else {
       data = new Blob([new ArrayBuffer(2)]);
     }
 
-    var packet = {
-      type: parser.BINARY_EVENT,
-      data: data,
+    const packet = {
+      type: PacketType.EVENT,
+      data: ["a", data],
       id: 0,
-      nsp: '/'
+      nsp: "/",
     };
-    helpers.test_bin(packet);
+    return helpers.test_bin(packet);
   });
 
-  it('encodes an Blob deep in JSON', function() {
-    var data;
-    if (BlobBuilder) {
-      var bb = new BlobBuilder();
+  it("encodes an Blob deep in JSON", () => {
+    let data;
+    if (BlobBuilderImpl) {
+      const bb = new BlobBuilderImpl();
       bb.append(new ArrayBuffer(2));
       data = bb.getBlob();
     } else {
       data = new Blob([new ArrayBuffer(2)]);
     }
 
-    var packet = {
-      type: parser.BINARY_EVENT,
-      data: {a: 'hi', b: { why: data }, c: 'bye'},
+    const packet = {
+      type: PacketType.EVENT,
+      data: ["a", { a: "hi", b: { why: data }, c: "bye" }],
       id: 999,
-      nsp: '/deep'
+      nsp: "/deep",
     };
-    helpers.test_bin(packet);
+    return helpers.test_bin(packet);
   });
 
-  it('encodes a binary ack with a blob', function() {
-    var data;
-    if (BlobBuilder) {
-      var bb = new BlobBuilder();
+  it("encodes a binary ack with a blob", () => {
+    let data;
+    if (BlobBuilderImpl) {
+      const bb = new BlobBuilderImpl();
       bb.append(new ArrayBuffer(2));
       data = bb.getBlob();
     } else {
       data = new Blob([new ArrayBuffer(2)]);
     }
 
-    var packet = {
-      type: parser.BINARY_ACK,
-      data: {a: 'hi ack', b: { why: data }, c: 'bye ack'},
+    const packet = {
+      type: PacketType.ACK,
+      data: [{ a: "hi ack", b: { why: data }, c: "bye ack" }],
       id: 999,
-      nsp: '/deep'
+      nsp: "/deep",
     };
-    helpers.test_bin(packet);
-  })
-
+    return helpers.test_bin(packet);
+  });
 });

test/buffer.js

@@ -1,66 +1,65 @@
-var parser = require('../index.js');
-var expect = require('expect.js');
-var helpers = require('./helpers.js');
-var Decoder = parser.Decoder;
+const { PacketType, Decoder } = require("../");
+const helpers = require("./helpers.js");
+const expect = require("expect.js");
 
-describe('parser', function() {
-  it('encodes a Buffer', function() {
-      helpers.test_bin({
-        type: parser.BINARY_EVENT,
-        data: ['a', new Buffer('abc', 'utf8')],
-        id: 23,
-        nsp: '/cool'
-      });
+describe("Buffer", () => {
+  it("encodes a Buffer", () => {
+    return helpers.test_bin({
+      type: PacketType.EVENT,
+      data: ["a", Buffer.from("abc", "utf8")],
+      id: 23,
+      nsp: "/cool",
+    });
   });
 
-  it("encodes a nested Buffer", function() {
-    helpers.test_bin({
-      type: parser.BINARY_EVENT,
+  it("encodes a nested Buffer", () => {
+    return helpers.test_bin({
+      type: PacketType.EVENT,
       data: ["a", { b: ["c", Buffer.from("abc", "utf8")] }],
       id: 23,
       nsp: "/cool",
     });
   });
 
-  it('encodes a binary ack with Buffer', function() {
-    helpers.test_bin({
-      type: parser.BINARY_ACK,
-      data: ['a', new Buffer('xxx', 'utf8'), {}],
+  it("encodes a binary ack with Buffer", () => {
+    return helpers.test_bin({
+      type: PacketType.ACK,
+      data: ["a", Buffer.from("xxx", "utf8"), {}],
       id: 127,
-      nsp: '/back'
-    })
+      nsp: "/back",
+    });
   });
 
-  it("throws an error when adding an attachment with an invalid 'num' attribute (string)", function() {
-    var decoder = new Decoder();
+  it("throws an error when adding an attachment with an invalid 'num' attribute (string)", () => {
+    const decoder = new Decoder();
 
-    expect(function() {
+    expect(() => {
       decoder.add('51-["hello",{"_placeholder":true,"num":"splice"}]');
       decoder.add(Buffer.from("world"));
     }).to.throwException(/^illegal attachments$/);
   });
 
-  it("throws an error when adding an attachment with an invalid 'num' attribute (out-of-bound)", function() {
-    var decoder = new Decoder();
+  it("throws an error when adding an attachment with an invalid 'num' attribute (out-of-bound)", () => {
+    const decoder = new Decoder();
 
-    expect(function() {
+    expect(() => {
       decoder.add('51-["hello",{"_placeholder":true,"num":1}]');
       decoder.add(Buffer.from("world"));
     }).to.throwException(/^illegal attachments$/);
   });
 
-  it("throws an error when adding an attachment without header", function() {
-    var decoder = new Decoder();
+  it("throws an error when adding an attachment without header", () => {
+    const decoder = new Decoder();
 
-    expect(function() {
+    expect(() => {
       decoder.add(Buffer.from("world"));
     }).to.throwException(/^got binary data when not reconstructing a packet$/);
   });
 
-  it("throws an error when decoding a binary event without attachments", function() {
-    var decoder = new Decoder();
+  it("throws an error when decoding a binary event without attachments", () => {
+    const decoder = new Decoder();
 
-    expect(function() {
+    expect(() => {
       decoder.add('51-["hello",{"_placeholder":true,"num":0}]');
       decoder.add('2["hello"]');
     }).to.throwException(/^got plaintext data when reconstructing a packet$/);

test/helpers.js

@@ -1,46 +1,35 @@
-var parser = require('../index.js');
-var expect = require('expect.js');
-var encoder = new parser.Encoder();
+const parser = require("..");
+const expect = require("expect.js");
+const encoder = new parser.Encoder();
 
 // tests encoding and decoding a single packet
-module.exports.test = function(obj){
-  encoder.encode(obj, function(encodedPackets) {
-    var decoder = new parser.Decoder();
-    decoder.on('decoded', function(packet) {
+module.exports.test = (obj) => {
+  return new Promise((resolve) => {
+    const encodedPackets = encoder.encode(obj);
+
+    const decoder = new parser.Decoder();
+    decoder.on("decoded", (packet) => {
       expect(packet).to.eql(obj);
+      resolve();
     });
 
     decoder.add(encodedPackets[0]);
   });
-}
+};
 
 // tests encoding of binary packets
-module.exports.test_bin = function test_bin(obj) {
-  var originalData = obj.data;
-  encoder.encode(obj, function(encodedPackets) {
-    var decoder = new parser.Decoder();
-    decoder.on('decoded', function(packet) {
-      obj.data = originalData;
-      obj.attachments = undefined;
+module.exports.test_bin = (obj) => {
+  return new Promise((resolve) => {
+    const encodedPackets = encoder.encode(obj);
+
+    const decoder = new parser.Decoder();
+    decoder.on("decoded", (packet) => {
       expect(obj).to.eql(packet);
+      resolve();
     });
 
-    for (var i = 0; i < encodedPackets.length; i++) {
+    for (let i = 0; i < encodedPackets.length; i++) {
       decoder.add(encodedPackets[i]);
     }
   });
-}
-
-// array buffer's slice is native code that is not transported across
-// socket.io via msgpack, so regular .eql fails
-module.exports.testArrayBuffers = function(buf1, buf2) {
-   buf1.slice = undefined;
-   buf2.slice = undefined;
-   expect(buf1).to.eql(buf2);
-}
-
-module.exports.testPacketMetadata = function(p1, p2) {
-  expect(p1.type).to.eql(p2.type);
-  expect(p1.id).to.eql(p2.id);
-  expect(p1.nsp).to.eql(p2.nsp);
-}
+};

test/index.js

@@ -1,33 +1,41 @@
-var env = require('./support/env.js');
+const env = require("./support/env.js");
 
-var blobSupported = (function() {
+const blobSupported = (function () {
   try {
-    new Blob(['hi']);
+    new Blob(["hi"]);
     return true;
-  } catch(e) {}
+  } catch (e) {}
   return false;
 })();
 
 /**
  * Create a blob builder even when vendor prefixes exist
  */
+const BlobBuilderImpl =
+  typeof BlobBuilder !== "undefined"
+    ? BlobBuilder
+    : typeof WebKitBlobBuilder !== "undefined"
+    ? WebKitBlobBuilder
+    : typeof MSBlobBuilder !== "undefined"
+    ? MSBlobBuilder
+    : typeof MozBlobBuilder !== "undefined"
+    ? MozBlobBuilder
+    : false;
+const blobBuilderSupported =
+  !!BlobBuilderImpl &&
+  !!BlobBuilderImpl.prototype.append &&
+  !!BlobBuilderImpl.prototype.getBlob;
 
-var BlobBuilder = typeof BlobBuilder !== 'undefined' ? BlobBuilder :
-                  typeof WebKitBlobBuilder !== 'undefined' ? WebKitBlobBuilder :
-                  typeof MSBlobBuilder !== 'undefined' ? MSBlobBuilder :
-                  typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder : false;
-var blobBuilderSupported = !!BlobBuilder && !!BlobBuilder.prototype.append && !!BlobBuilder.prototype.getBlob;
-
-require('./parser.js');
+require("./parser.js");
 
 if (!env.browser) {
-  require('./buffer.js');
+  require("./buffer.js");
 }
 
-if (typeof ArrayBuffer !== 'undefined') {
-  require('./arraybuffer.js');
+if (typeof ArrayBuffer !== "undefined") {
+  require("./arraybuffer.js");
 }
 
 if (blobSupported || blobBuilderSupported) {
-  require('./blob.js');
+  require("./blob.js");
 }

test/parser.js

@@ -1,126 +1,151 @@
-var parser = require('../index.js');
-var expect = require('expect.js');
-var helpers = require('./helpers.js');
+const { PacketType, Decoder, Encoder } = require("..");
+const expect = require("expect.js");
+const helpers = require("./helpers.js");
 
-describe('parser', function(){
-
-  it('exposes types', function(){
-    expect(parser.CONNECT).to.be.a('number');
-    expect(parser.DISCONNECT).to.be.a('number');
-    expect(parser.EVENT).to.be.a('number');
-    expect(parser.ACK).to.be.a('number');
-    expect(parser.ERROR).to.be.a('number');
-    expect(parser.BINARY_EVENT).to.be.a('number');
-    expect(parser.BINARY_ACK).to.be.a('number');
+describe("socket.io-parser", () => {
+  it("exposes types", () => {
+    expect(PacketType.CONNECT).to.be.a("number");
+    expect(PacketType.DISCONNECT).to.be.a("number");
+    expect(PacketType.EVENT).to.be.a("number");
+    expect(PacketType.ACK).to.be.a("number");
+    expect(PacketType.CONNECT_ERROR).to.be.a("number");
+    expect(PacketType.BINARY_EVENT).to.be.a("number");
+    expect(PacketType.BINARY_ACK).to.be.a("number");
   });
 
-  it('encodes connection', function(){
-    helpers.test({
-      type: parser.CONNECT,
-      nsp: '/woot'
+  it("encodes connection", () => {
+    return helpers.test({
+      type: PacketType.CONNECT,
+      nsp: "/woot",
+      data: {
+        token: "123",
+      },
     });
   });
 
-  it('encodes disconnection', function(){
-    helpers.test({
-      type: parser.DISCONNECT,
-      nsp: '/woot'
+  it("encodes disconnection", () => {
+    return helpers.test({
+      type: PacketType.DISCONNECT,
+      nsp: "/woot",
     });
   });
 
-  it('encodes an event', function(){
-    helpers.test({
-      type: parser.EVENT,
-      data: ['a', 1, {}],
-      nsp: '/'
+  it("encodes an event", () => {
+    return helpers.test({
+      type: PacketType.EVENT,
+      data: ["a", 1, {}],
+      nsp: "/",
     });
-    helpers.test({
-      type: parser.EVENT,
-      data: ['a', 1, {}],
+  });
+
+  it("encodes an event (with an integer as event name)", () => {
+    return helpers.test({
+      type: PacketType.EVENT,
+      data: [1, "a", {}],
+      nsp: "/",
+    });
+  });
+
+  it("encodes an event (with ack)", () => {
+    return helpers.test({
+      type: PacketType.EVENT,
+      data: ["a", 1, {}],
       id: 1,
-      nsp: '/test'
+      nsp: "/test",
     });
   });
 
-  it('encodes an ack', function(){
-    helpers.test({
-      type: parser.ACK,
-      data: ['a', 1, {}],
+  it("encodes an ack", () => {
+    return helpers.test({
+      type: PacketType.ACK,
+      data: ["a", 1, {}],
       id: 123,
-      nsp: '/'
+      nsp: "/",
     });
   });
 
-  it('encodes an error', function(){
-    helpers.test({
-      type: parser.ERROR,
-      data: 'Unauthorized',
-      nsp: '/'
+  it("encodes an connect error", () => {
+    return helpers.test({
+      type: PacketType.CONNECT_ERROR,
+      data: "Unauthorized",
+      nsp: "/",
     });
   });
 
-  it('properly handles circular objects', function() {
-    var a = {};
+  it("encodes an connect error (with object)", () => {
+    return helpers.test({
+      type: PacketType.CONNECT_ERROR,
+      data: {
+        message: "Unauthorized",
+      },
+      nsp: "/",
+    });
+  });
+
+  it("throws an error when encoding circular objects", () => {
+    const a = {};
     a.b = a;
 
-    var data = {
-      type: parser.EVENT,
+    const data = {
+      type: PacketType.EVENT,
       data: a,
       id: 1,
-      nsp: '/'
-    }
+      nsp: "/",
+    };
 
-    var encoder = new parser.Encoder();
+    const encoder = new Encoder();
 
-    encoder.encode(data, function(encodedPackets) {
-      expect(encodedPackets[0]).to.be('4"encode error"');
-    });
+    expect(() => encoder.encode(data)).to.throwException();
   });
 
-  it('decodes a bad binary packet', function(){
+  it("decodes a bad binary packet", () => {
     try {
-      var decoder = new parser.Decoder();
-      decoder.add('5');
-    } catch(e){
+      const decoder = new Decoder();
+      decoder.add("5");
+    } catch (e) {
       expect(e.message).to.match(/Illegal/);
     }
   });
 
-  it('returns an error packet on parsing error', function(){
-    function isInvalidPayload (str) {
-      expect(function () {
-        new parser.Decoder().add(str)
-      }).to.throwException(/^invalid payload$/);
-    }
+  it("throw an error upon parsing error", () => {
+    const isInvalidPayload = (str) =>
+      expect(() => new Decoder().add(str)).to.throwException(
+        /^invalid payload$/
+      );
 
     isInvalidPayload('442["some","data"');
     isInvalidPayload('0/admin,"invalid"');
+    isInvalidPayload("0[]");
     isInvalidPayload("1/admin,{}");
     isInvalidPayload('2/admin,"invalid');
     isInvalidPayload("2/admin,{}");
     isInvalidPayload('2[{"toString":"foo"}]');
     isInvalidPayload('2[true,"foo"]');
     isInvalidPayload('2[null,"bar"]');
+    isInvalidPayload('2["connect"]');
+    isInvalidPayload('2["disconnect","123"]');
 
-    function isInvalidAttachmentCount (str) {
-      expect(() => new parser.Decoder().add(str)).to.throwException(
-          /^Illegal attachments$/,
-      );
-    }
+    expect(() => new Decoder().add("999")).to.throwException(
+      /^unknown packet type 9$/
+    );
 
-    isInvalidAttachmentCount("5");
-    isInvalidAttachmentCount("51");
-    isInvalidAttachmentCount("5a-");
-    isInvalidAttachmentCount("51.23-");
+    expect(() => new Decoder().add(999)).to.throwException(
+      /^Unknown type: 999$/
+    );
   });
 
-  it("throws an error when receiving too many attachments", () => {
-    const decoder = new parser.Decoder({ maxAttachments: 2 });
+  it("should resume decoding after calling destroy()", () => {
+    return new Promise((resolve) => {
+      const decoder = new Decoder();
 
-    expect(() => {
-      decoder.add(
-          '53-["hello",{"_placeholder":true,"num":0},{"_placeholder":true,"num":1},{"_placeholder":true,"num":2}]',
-      );
-    }).to.throwException(/^too many attachments$/);
+      decoder.on("decoded", (packet) => {
+        expect(packet.data).to.eql(["hello"]);
+        resolve();
+      });
+
+      decoder.add('51-["hello"]');
+      decoder.destroy();
+      decoder.add('2["hello"]');
+    });
   });
 });

test/support/env.js

@@ -2,4 +2,4 @@
 // we only do this in our tests because we need to test engine.io-client
 // support in browsers and in node.js
 // some tests do not yet work in both
-module.exports.browser = typeof window !== 'undefined';
+module.exports.browser = typeof window !== "undefined";

tsconfig.esm.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "outDir": "build/esm/",
+    "target": "es2018",
+    "module": "esnext",
+    "moduleResolution": "node",
+    "declaration": true
+  },
+  "include": [
+    "./lib/**/*"
+  ]
+}

tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "outDir": "build/cjs/",
+    "target": "es2018", // Node.js 10 (https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping)
+    "module": "commonjs",
+    "declaration": true
+  },
+  "include": [
+    "./lib/**/*"
+  ]
+}

wdio.conf.js

@@ -0,0 +1,94 @@
+const BASE_SAUCE_OPTIONS = {
+  build: process.env.GITHUB_RUN_ID || "local",
+  name: "socket.io-parser",
+};
+
+const config = {
+  specs: ["./test/index.js"],
+
+  capabilities: [
+    {
+      browserName: "chrome",
+    },
+  ],
+
+  maxInstances: 5,
+  logLevel: "warn",
+  bail: 0,
+  baseUrl: "http://localhost",
+
+  reporters: ["spec"],
+  framework: "mocha",
+  mochaOpts: {
+    ui: "bdd",
+    timeout: 60000,
+  },
+};
+
+if (process.env.CI === "true") {
+  config.services = ["sauce"];
+  config.user = process.env.SAUCE_USERNAME;
+  config.key = process.env.SAUCE_ACCESS_KEY;
+
+  // https://saucelabs.com/platform/platform-configurator#/
+  config.capabilities = [
+    {
+      browserName: "chrome",
+      browserVersion: "latest",
+      platformName: "Windows 11",
+      "sauce:options": BASE_SAUCE_OPTIONS,
+    },
+    {
+      browserName: "MicrosoftEdge",
+      browserVersion: "latest",
+      platformName: "Windows 11",
+      "sauce:options": BASE_SAUCE_OPTIONS,
+    },
+    {
+      browserName: "firefox",
+      browserVersion: "latest",
+      platformName: "Windows 11",
+      "sauce:options": BASE_SAUCE_OPTIONS,
+    },
+    {
+      browserName: "internet explorer",
+      browserVersion: "10",
+      platformName: "Windows 7",
+      "sauce:options": BASE_SAUCE_OPTIONS,
+    },
+    {
+      browserName: "safari",
+      browserVersion: "latest",
+      platformName: "macOS 12",
+      "sauce:options": BASE_SAUCE_OPTIONS,
+    },
+    {
+      platformName: "Android",
+      browserName: "Chrome",
+      "appium:deviceName": "Android GoogleAPI Emulator",
+      "appium:platformVersion": "latest",
+      "appium:automationName": "UiAutomator2",
+      "sauce:options": Object.assign(
+        {
+          appiumVersion: "1.22.1",
+        },
+        BASE_SAUCE_OPTIONS
+      ),
+    },
+    {
+      platformName: "iOS",
+      browserName: "Safari",
+      "appium:deviceName": "iPhone Simulator",
+      "appium:platformVersion": "latest",
+      "appium:automationName": "XCUITest",
+      "sauce:options": Object.assign(
+        {
+          appiumVersion: "2.0.0",
+        },
+        BASE_SAUCE_OPTIONS
+      ),
+    },
+  ];
+}
+
+exports.config = config;

zuul.config.js

@@ -1,39 +0,0 @@
-'use strict';
-
-var browsers = require('socket.io-browsers');
-
-var zuulConfig = module.exports = {
-  ui: 'mocha-bdd',
-
-  // test on localhost by default
-  local: true,
-
-  concurrency: 2, // ngrok only accepts two tunnels by default
-  // if browser does not sends output in 120s since last output:
-  // stop testing, something is wrong
-  browser_output_timeout: 120 * 1000,
-  browser_open_timeout: 60 * 4 * 1000,
-  // we want to be notified something is wrong asap, so no retry
-  browser_retries: 1
-};
-
-if (process.env.CI === 'true') {
-  zuulConfig.local = false;
-  zuulConfig.tunnel = {
-    type: 'ngrok',
-    bind_tls: true
-  };
-  zuulConfig.browserify = [
-    {
-      transform: {
-        name: "babelify",
-        presets: ["@babel/preset-env"],
-        global: true,
-        only: [ /\/node_modules\/debug\// ]
-      }
-    }
-  ]
-}
-
-var isPullRequest = process.env.TRAVIS_PULL_REQUEST && process.env.TRAVIS_PULL_REQUEST !== 'false';
-zuulConfig.browsers = isPullRequest ? browsers.pullRequest : browsers.all;