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# Production Build Optimization Scripts
## optimize-standalone.js
This script removes unnecessary development dependencies from the Next.js standalone build output to reduce the production Docker image size.
### What it does
The script specifically targets and removes `jest-worker` packages that are bundled with Next.js but not needed in production. These packages are included because:
1. Next.js includes jest-worker in its compiled dependencies
1. terser-webpack-plugin (used by Next.js for minification) depends on jest-worker
1. pnpm's dependency resolution creates symlinks to jest-worker in various locations
### Usage
The script is automatically run during Docker builds via the `build:docker` npm script:
```bash
# Docker build (removes jest-worker after build)
pnpm build:docker
```
To run the optimization manually:
```bash
node scripts/optimize-standalone.js
```
### What gets removed
- `node_modules/.pnpm/next@*/node_modules/next/dist/compiled/jest-worker`
- `node_modules/.pnpm/terser-webpack-plugin@*/node_modules/jest-worker` (symlinks)
- `node_modules/.pnpm/jest-worker@*` (actual packages)
### Impact
Removing jest-worker saves approximately 36KB per instance from the production image. While this may seem small, it helps ensure production images only contain necessary runtime dependencies.

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#!/usr/bin/env node
/**
* This script copies static files to the target directory and starts the server.
* It is intended to be used as a replacement for `next start`.
*/
import { cp, mkdir, stat } from 'node:fs/promises'
import { spawn } from 'node:child_process'
import path from 'node:path'
// Configuration for directories to copy
const DIRS_TO_COPY = [
{
src: path.join('.next', 'static'),
dest: path.join('.next', 'standalone', '.next', 'static'),
},
{
src: 'public',
dest: path.join('.next', 'standalone', 'public'),
},
]
// Path to the server script
const SERVER_SCRIPT_PATH = path.join('.next', 'standalone', 'server.js')
// Function to check if a path exists
const pathExists = async (path) => {
try {
console.debug(`Checking if path exists: ${path}`)
await stat(path)
console.debug(`Path exists: ${path}`)
return true
}
catch (err) {
if (err.code === 'ENOENT') {
console.warn(`Path does not exist: ${path}`)
return false
}
throw err
}
}
// Function to recursively copy directories
const copyDir = async (src, dest) => {
console.debug(`Copying directory from ${src} to ${dest}`)
await cp(src, dest, { recursive: true })
console.info(`Successfully copied ${src} to ${dest}`)
}
// Process each directory copy operation
const copyAllDirs = async () => {
console.debug('Starting directory copy operations')
for (const { src, dest } of DIRS_TO_COPY) {
try {
// Instead of pre-creating destination directory, we ensure parent directory exists
const destParent = path.dirname(dest)
console.debug(`Ensuring destination parent directory exists: ${destParent}`)
await mkdir(destParent, { recursive: true })
if (await pathExists(src)) {
await copyDir(src, dest)
}
else {
console.error(`Error: ${src} directory does not exist. This is a required build artifact.`)
process.exit(1)
}
}
catch (err) {
console.error(`Error processing ${src}:`, err.message)
process.exit(1)
}
}
console.debug('Finished directory copy operations')
}
// Run copy operations and start server
const main = async () => {
console.debug('Starting copy-and-start script')
await copyAllDirs()
// Start server
const port = process.env.npm_config_port || process.env.PORT || '3000'
const host = process.env.npm_config_host || process.env.HOSTNAME || '0.0.0.0'
console.info(`Starting server on ${host}:${port}`)
console.debug(`Server script path: ${SERVER_SCRIPT_PATH}`)
console.debug(`Environment variables - PORT: ${port}, HOSTNAME: ${host}`)
const server = spawn(
process.execPath,
[SERVER_SCRIPT_PATH],
{
env: {
...process.env,
PORT: port,
HOSTNAME: host,
},
stdio: 'inherit',
},
)
server.on('error', (err) => {
console.error('Failed to start server:', err)
process.exit(1)
})
server.on('exit', (code) => {
console.debug(`Server exited with code: ${code}`)
process.exit(code || 0)
})
}
main().catch((err) => {
console.error('Unexpected error:', err)
process.exit(1)
})

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const sharp = require('sharp');
const fs = require('fs');
const path = require('path');
const sizes = [
{ size: 192, name: 'icon-192x192.png' },
{ size: 256, name: 'icon-256x256.png' },
{ size: 384, name: 'icon-384x384.png' },
{ size: 512, name: 'icon-512x512.png' },
{ size: 96, name: 'icon-96x96.png' },
{ size: 72, name: 'icon-72x72.png' },
{ size: 128, name: 'icon-128x128.png' },
{ size: 144, name: 'icon-144x144.png' },
{ size: 152, name: 'icon-152x152.png' },
];
const inputPath = path.join(__dirname, '../public/icon.svg');
const outputDir = path.join(__dirname, '../public');
// Generate icons
async function generateIcons() {
try {
console.log('Generating PWA icons...');
for (const { size, name } of sizes) {
const outputPath = path.join(outputDir, name);
await sharp(inputPath)
.resize(size, size)
.png()
.toFile(outputPath);
console.log(`✓ Generated ${name} (${size}x${size})`);
}
// Generate apple-touch-icon
await sharp(inputPath)
.resize(180, 180)
.png()
.toFile(path.join(outputDir, 'apple-touch-icon.png'));
console.log('✓ Generated apple-touch-icon.png (180x180)');
console.log('\n✅ All icons generated successfully!');
} catch (error) {
console.error('Error generating icons:', error);
process.exit(1);
}
}
generateIcons();

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/**
* Script to optimize Next.js standalone output for production
* Removes unnecessary files like jest-worker that are bundled with Next.js
*/
const fs = require('fs');
const path = require('path');
console.log('🔧 Optimizing standalone output...');
const standaloneDir = path.join(__dirname, '..', '.next', 'standalone');
// Check if standalone directory exists
if (!fs.existsSync(standaloneDir)) {
console.error('❌ Standalone directory not found. Please run "next build" first.');
process.exit(1);
}
// List of paths to remove (relative to standalone directory)
const pathsToRemove = [
// Remove jest-worker from Next.js compiled dependencies
'node_modules/.pnpm/next@*/node_modules/next/dist/compiled/jest-worker',
// Remove jest-worker symlinks from terser-webpack-plugin
'node_modules/.pnpm/terser-webpack-plugin@*/node_modules/jest-worker',
// Remove actual jest-worker packages (directories only, not symlinks)
'node_modules/.pnpm/jest-worker@*',
];
// Function to safely remove a path
function removePath(basePath, relativePath) {
const fullPath = path.join(basePath, relativePath);
// Handle wildcard patterns
if (relativePath.includes('*')) {
const parts = relativePath.split('/');
let currentPath = basePath;
for (let i = 0; i < parts.length; i++) {
const part = parts[i];
if (part.includes('*')) {
// Find matching directories
if (fs.existsSync(currentPath)) {
const entries = fs.readdirSync(currentPath);
// replace '*' with '.*'
const regexPattern = part.replace(/\*/g, '.*');
const regex = new RegExp(`^${regexPattern}$`);
for (const entry of entries) {
if (regex.test(entry)) {
const remainingPath = parts.slice(i + 1).join('/');
const matchedPath = path.join(currentPath, entry, remainingPath);
try {
// Use lstatSync to check if path exists (works for both files and symlinks)
const stats = fs.lstatSync(matchedPath);
if (stats.isSymbolicLink()) {
// Remove symlink
fs.unlinkSync(matchedPath);
console.log(`✅ Removed symlink: ${path.relative(basePath, matchedPath)}`);
} else {
// Remove directory/file
fs.rmSync(matchedPath, { recursive: true, force: true });
console.log(`✅ Removed: ${path.relative(basePath, matchedPath)}`);
}
} catch (error) {
// Silently ignore ENOENT (path not found) errors
if (error.code !== 'ENOENT') {
console.error(`❌ Failed to remove ${matchedPath}: ${error.message}`);
}
}
}
}
}
return;
} else {
currentPath = path.join(currentPath, part);
}
}
} else {
// Direct path removal
if (fs.existsSync(fullPath)) {
try {
fs.rmSync(fullPath, { recursive: true, force: true });
console.log(`✅ Removed: ${relativePath}`);
} catch (error) {
console.error(`❌ Failed to remove ${fullPath}: ${error.message}`);
}
}
}
}
// Remove unnecessary paths
console.log('🗑️ Removing unnecessary files...');
for (const pathToRemove of pathsToRemove) {
removePath(standaloneDir, pathToRemove);
}
// Calculate size reduction
console.log('\n📊 Optimization complete!');
// Optional: Display the size of remaining jest-related files (if any)
const checkForJest = (dir) => {
const jestFiles = [];
function walk(currentPath) {
if (!fs.existsSync(currentPath)) return;
try {
const entries = fs.readdirSync(currentPath);
for (const entry of entries) {
const fullPath = path.join(currentPath, entry);
try {
const stat = fs.lstatSync(fullPath); // Use lstatSync to handle symlinks
if (stat.isDirectory() && !stat.isSymbolicLink()) {
// Skip node_modules subdirectories to avoid deep traversal
if (entry === 'node_modules' && currentPath !== standaloneDir) {
continue;
}
walk(fullPath);
} else if (stat.isFile() && entry.includes('jest')) {
jestFiles.push(path.relative(standaloneDir, fullPath));
}
} catch (err) {
// Skip files that can't be accessed
continue;
}
}
} catch (err) {
// Skip directories that can't be read
return;
}
}
walk(dir);
return jestFiles;
};
const remainingJestFiles = checkForJest(standaloneDir);
if (remainingJestFiles.length > 0) {
console.log('\n⚠ Warning: Some jest-related files still remain:');
remainingJestFiles.forEach(file => console.log(` - ${file}`));
} else {
console.log('\n✨ No jest-related files found in standalone output!');
}