Add minify-node-modules script to reduce memory usage via esbuild

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

package.json

@@ -23,6 +23,7 @@
 		"build-pre": "node ./scripts/build-pre.js",
 		"build-assets": "node ./scripts/build-assets.mjs",
 		"build": "pnpm build-pre && pnpm -r build && pnpm build-assets",
+		"minify-node-modules": "node ./scripts/minify-node-modules.mjs",
 		"build-storybook": "pnpm --filter frontend build-storybook",
 		"build-misskey-js-with-types": "pnpm build-pre && pnpm --filter backend... --filter=!misskey-js build && pnpm --filter backend generate-api-json --no-build && ncp packages/backend/built/api.json packages/misskey-js/generator/api.json && pnpm --filter misskey-js update-autogen-code && pnpm --filter misskey-js build && pnpm --filter misskey-js api",
 		"start": "pnpm check:connect && cd packages/backend && node ./built/boot/entry.js",

scripts/minify-node-modules.mjs

@@ -0,0 +1,123 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * This script minifies JavaScript files in node_modules to reduce memory usage.
+ * V8 keeps script source code in memory, so minifying reduces memory consumption.
+ *
+ * Usage:
+ *   node scripts/minify-node-modules.mjs
+ *
+ * Environment variables:
+ *   MISSKEY_MINIFY_NODE_MODULES - Set to 'true' to enable minification (default: true in production)
+ *   NODE_ENV - When set to 'development', minification is skipped
+ */
+
+import * as fs from 'node:fs/promises';
+import * as path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import * as esbuild from 'esbuild';
+import glob from 'fast-glob';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const rootDir = path.resolve(__dirname, '..');
+
+// Skip minification in development mode unless explicitly enabled
+const isDevelopment = process.env.NODE_ENV === 'development';
+const shouldMinify = process.env.MISSKEY_MINIFY_NODE_MODULES === 'true' ||
+	(process.env.MISSKEY_MINIFY_NODE_MODULES !== 'false' && !isDevelopment);
+
+if (!shouldMinify) {
+	console.log('Skipping node_modules minification (development mode or disabled via MISSKEY_MINIFY_NODE_MODULES=false)');
+	process.exit(0);
+}
+
+console.log('Minifying node_modules JavaScript files...');
+
+const pnpmDir = path.join(rootDir, 'node_modules', '.pnpm');
+
+// Check if pnpm directory exists
+try {
+	await fs.access(pnpmDir);
+} catch {
+	console.log('No pnpm node_modules found, skipping minification');
+	process.exit(0);
+}
+
+// Find all JavaScript files in node_modules/.pnpm
+// Use followSymbolicLinks: false to avoid following symlinks to workspace packages
+const jsFiles = await glob('**/*.js', {
+	cwd: pnpmDir,
+	absolute: true,
+	followSymbolicLinks: false,
+	ignore: [
+		// Ignore already minified files
+		'**/*.min.js',
+		// Ignore source maps
+		'**/*.js.map',
+		// Ignore TypeScript declaration files that might be named .js
+		'**/*.d.js',
+		// Ignore workspace package symlinks
+		'node_modules/backend/**',
+		'node_modules/frontend/**',
+		'node_modules/frontend-embed/**',
+		'node_modules/frontend-shared/**',
+		'node_modules/frontend-builder/**',
+		'node_modules/icons-subsetter/**',
+		'node_modules/sw/**',
+		'node_modules/misskey-js/**',
+		'node_modules/misskey-js-type-generator/**',
+		'node_modules/misskey-reversi/**',
+		'node_modules/misskey-bubble-game/**',
+	],
+});
+
+console.log(`Found ${jsFiles.length} JavaScript files to minify`);
+
+// Process files in parallel batches for efficiency
+const BATCH_SIZE = 100;
+let processed = 0;
+let errors = 0;
+
+for (let i = 0; i < jsFiles.length; i += BATCH_SIZE) {
+	const batch = jsFiles.slice(i, i + BATCH_SIZE);
+
+	await Promise.all(batch.map(async (filePath) => {
+		try {
+			const content = await fs.readFile(filePath, 'utf-8');
+
+			// Skip empty files or very small files (likely not worth minifying)
+			if (content.length < 50) {
+				processed++;
+				return;
+			}
+
+			const result = await esbuild.transform(content, {
+				loader: 'js',
+				minifyWhitespace: true,
+				// Keep identifiers to preserve compatibility with reflection-based code
+				minifyIdentifiers: false,
+				minifySyntax: false,
+			});
+
+			await fs.writeFile(filePath, result.code);
+			processed++;
+		} catch (err) {
+			// Some files may have syntax that esbuild doesn't handle well, skip them
+			errors++;
+			if (process.env.DEBUG) {
+				console.error(`Failed to minify ${filePath}: ${err.message}`);
+			}
+		}
+	}));
+
+	// Progress update every 10 batches
+	if ((i / BATCH_SIZE) % 10 === 0) {
+		console.log(`Progress: ${processed}/${jsFiles.length} files processed...`);
+	}
+}
+
+console.log(`Minification complete: ${processed} files processed, ${errors} files skipped due to errors`);