ci: add Node.js 20 in the test matrix

Reference: https://github.com/nodejs/Release

.github/workflows/ci.yml

@@ -16,7 +16,9 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14, 16]
+        node-version:
+          - 14
+          - 20
 
     steps:
       - name: Checkout repository
@@ -41,10 +43,10 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
 
-      - name: Use Node.js 16
+      - name: Use Node.js 20
         uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: 20
 
       - name: Install dependencies
         run: npm ci

test/connection.ts

@@ -771,7 +771,10 @@ describe("connection", () => {
     });
   }
 
-  if (global.Blob && null != textBlobBuilder("xxx")) {
+  // Blob is available in Node.js since v18, but not yet supported by the `engine.io-parser` package
+  const isBrowser = typeof window !== "undefined";
+
+  if (isBrowser && global.Blob && textBlobBuilder("xxx") !== null) {
     it("should send binary data (as a Blob)", () => {
       return wrap((done) => {
         const socket = io(BASE_URL, { forceNew: true });