add build-sw.js

scripts/build-sw.js

@@ -0,0 +1,14 @@
+const { generateSW } = require('workbox-build');
+
+generateSW({
+    globDirectory: 'docs/',
+    globPatterns: ['assets/**/*.{css,woff2,png,svg,jpg,js}'],
+    maximumFileSizeToCacheInBytes: 1024 * 1024 * 5,
+    swDest: 'docs/sw.js',
+    sourcemap: false,
+}).then(({ count, size, warnings }) => {
+    if (warnings.length > 0) {
+        console.warn('Warnings encountered while generating a service worker:', warnings.join('\n'));
+    }
+    console.log(`Generated a service worker, which will precache ${count} files, totaling ${size} bytes.`);
+});