fix ci

Author: tomchen

.github/workflows/publish.yml

@@ -14,6 +14,10 @@ jobs:
         with:
           node-version: '12.x'
           registry-url: 'https://registry.npmjs.org'
+      - name: Install modules
+        run: npm install
+      - name: Build
+        run: npm run build
       - name: Publish to npm
         run: npm publish --access public
         env: