build via github actions

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+name: vscroll build
+
+on:
+  push:
+    branches:
+      - "**"
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+    inputs:
+      cause:
+        description: 'Reason'
+        required: true
+        default: 'Manual triggering'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [12.x]
+    steps:
+      - name: Dispatched?
+        if: ${{ github.event_name == 'workflow_dispatch' }}
+        run: |
+          echo "This is dispatched"
+          echo "Build reason: ${{ github.event.inputs.cause }}"
+
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - run: npm install
+      - run: npm test
+      - run: npm run build

package.json

@@ -28,7 +28,7 @@
     "watch": "jest --watch",
     "build": "node build",
     "test": "npm run lint && npm run jest",
-    "prepare": "npm run test && npm run build"
+    "prepublishOnly": "npm run test && npm run build"
   },
   "dependencies": {
     "tslib": "^2.1.0"