added yarnrc

.github/workflows/issue-902-2.yml

@@ -0,0 +1,27 @@
+name: Node.js CI
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: ['18.x']
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v3
+    - name: Use Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'yarn'
+
+    - name: Cache node modules
+      uses: actions/cache@v3
+      with:
+        path: ~/.yarn-cache
+        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-
+    - name: Install dependencies
+      run: yarn install --frozen-lockfile
+    - run: yarn postinstall

.yarnrc

@@ -0,0 +1 @@
+cache-folder "./.yarn-cache"

package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" ",
-    "postinstall": "node index.js"
+    "postinstall": "echo 'postinstall script ran!'"
   },
   "author": "",
   "license": "ISC",