Replace to shakapacker from webpacker

config/webpack/environments/production.js

@@ -0,0 +1,45 @@
+const { createHash } = require('crypto');
+const { readFileSync } = require('fs');
+const { resolve } = require('path');
+const { merge } = require('shakapacker');
+const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
+const { InjectManifest } = require('workbox-webpack-plugin');
+const baseConfig = require('./base');
+
+const root = resolve(__dirname, '..', '..', '..');
+
+/** @type {import('webpack').Configuration} */
+const productionConfig = {
+  plugins: [
+    new BundleAnalyzerPlugin({ // generates report.html
+      analyzerMode: 'static',
+      openAnalyzer: false,
+      logLevel: 'silent', // do not bother Webpacker, who runs with --json and parses stdout
+    }),
+    new InjectManifest({
+      additionalManifestEntries: ['1f602.svg', 'sheet_13.png'].map((filename) => {
+        const path = resolve(root, 'public', 'emoji', filename);
+        const body = readFileSync(path);
+        const md5  = createHash('md5');
+
+        md5.update(body);
+
+        return {
+          revision: md5.digest('hex'),
+          url: `/emoji/${filename}`,
+        };
+      }),
+      exclude: [
+        /(?:base|extra)_polyfills-.*\.js$/,
+        /locale_.*\.js$/,
+        /mailer-.*\.(?:css|js)$/,
+      ],
+      include: [/\.js$/, /\.css$/],
+      maximumFileSizeToCacheInBytes: 2 * 1_024 * 1_024, // 2 MiB
+      swDest: resolve(root, 'public', 'packs', 'sw.js'),
+      swSrc: resolve(root, 'app', 'javascript', 'mastodon', 'service_worker', 'entry.js'),
+    }),
+  ],
+};
+
+module.exports = merge({}, baseConfig, productionConfig);