chore: expand the CI matrix

Author: eugene1g

.github/workflows/validate-oldnode.yml

@@ -0,0 +1,32 @@
+name: Validate code
+on: [push, pull_request]
+permissions: { contents: read, packages: read }
+
+jobs:
+  testOldNode:
+    runs-on: ubuntu-latest
+    timeout-minutes: 2
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version:
+          - "18.13" # first version we support
+          - "20.0" # earliest in 20x LTS
+          - "20.x" # latest in 20x LTS
+          - "22.0" # before native TS support
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: ⏬ Install dependencies
+        run: yarn install && yarn add -D tsx
+
+      - name: ✅ Run tests
+        run: node --loader=tsx/esm --test __tests__/**/*.test.ts >> $GITHUB_STEP_SUMMARY
+
+      - name: 🏗 Run build
+        run: yarn build
+

.github/workflows/validate.yml

@@ -9,8 +9,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: ["22.x", "23.x"]
-        
+        node-version:
+          - "22.6" # supports --experimental-strip-types
+          - "22.x" # latest LTS
+          - "23.x" # Latest current
+
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4

README.md

@@ -26,7 +26,7 @@ s.listen(8989);
 
 
 # Gotchas
-* Must use Node.js `^18.13.0 || ^19.3.0` because of important changes [ref1](https://github.com/nodejs/node/pull/45672), [ref2](https://github.com/nodejs/node/pull/45642), [ref3](https://github.com/nodejs/node/issues/42694), [ref4](https://github.com/nodejs/node/issues/44188)
+* Must use Node.js `^18.13.0 || ^19.3.0 || >=20.0` because of important changes [ref1](https://github.com/nodejs/node/pull/45672), [ref2](https://github.com/nodejs/node/pull/45642), [ref3](https://github.com/nodejs/node/issues/42694), [ref4](https://github.com/nodejs/node/issues/44188)
 * In case there are multiple listeners installed, the first one to return a `Response` will "win" - that `Response` will be sent to the user. Note that this does not mean the first handler _mounted_ or the first one to be _called_ - some handlers can be slower than others. The first one to finish executing and returning a Response will win, regardless of when it was mounted.
 
 ## TODOs

package.json

@@ -6,6 +6,7 @@
     "@types/ws": "^8.5.13",
     "got": "^14.4.5",
     "prettier": "^3.4.2",
+    "tsx": "^4.19.2",
     "typescript": "^5.7.3",
     "ws": "^8.18.0"
   },