feat: add bundle with msgpack parser

Pros:

- events with binary content are sent as 1 WebSocket frame (instead of 2 with the default parser)
- payloads with lots of numbers should be smaller

Cons:

- no IE9 support (https://caniuse.com/mdn-javascript_builtins_arraybuffer)
- a slightly bigger bundle size (61.1 vs 59.9 KB)

Source: https://github.com/darrachequesne/socket.io-msgpack-parser

package.json

@@ -56,6 +56,7 @@
     "prettier": "^2.1.2",
     "socket.io": "3.0.0-rc2",
     "socket.io-browsers": "^1.0.0",
+    "socket.io-msgpack-parser": "^3.0.0",
     "text-blob-builder": "0.0.1",
     "ts-loader": "^8.0.5",
     "ts-node": "^9.0.0",
@@ -72,7 +73,7 @@
     "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 --require ts-node/register --reporter dot --require test/support/server.js test/index.js",
     "test:browser": "zuul test/index.js",
-    "build": "npm run compile && webpack --config ./support/webpack.config.js --config ./support/prod.config.js",
+    "build": "npm run compile && webpack --config ./support/webpack.config.js --config ./support/prod.config.js --config ./support/msgpack-parser.config.js",
     "format:check": "prettier --check 'lib/**/*.ts' 'test/**/*.js' 'test/**/*.ts' 'support/**/*.js'",
     "format:fix": "prettier --write 'lib/**/*.ts' 'test/**/*.js' 'test/**/*.ts' 'support/**/*.js'",
     "prepack": "npm run compile"

support/msgpack-parser.config.js

@@ -0,0 +1,17 @@
+const { NormalModuleReplacementPlugin } = require("webpack");
+const config = require("./prod.config");
+
+module.exports = {
+  ...config,
+  output: {
+    ...config.output,
+    filename: "socket.io.msgpack.min.js",
+  },
+  plugins: [
+    ...config.plugins,
+    new NormalModuleReplacementPlugin(
+      /^socket.io-parser$/,
+      "socket.io-msgpack-parser"
+    ),
+  ],
+};