transpilePackages

Use transpilePackages to compile and bundle a dependency instead of treating it as untouched runtime code. Values are package names, including scoped names like @scope/pkg. Paths and glob patterns are not supported.

/** @type {import('next').NextConfig} */
const nextConfig = {
  transpilePackages: ['package-name', '@scope/pkg'],
}

module.exports = nextConfig

This replaces the next-transpile-modules package.

When you need it

Turbopack transpiles workspace packages (npm, pnpm, or Yarn workspaces) in your monorepo automatically under both routers. Webpack does the same for the App Router. Add a package to transpilePackages when:

• A node_modules dependency ships raw TypeScript or JSX. Next.js does not compile code inside node_modules by default. Listing the package opts it in, or you can build the package to plain JavaScript and point its main/exports at the compiled output.
• You build with webpack for the Pages Router and the dependency's source lives outside the next app's directory. For example, an apps/web app importing packages/ui in the same monorepo.
• You use the Pages Router and want a node_modules dependency bundled into the route. Pages Router loads node_modules server-side dependencies through Node.js require at runtime. List the package to bundle its source into the route instead. App Router already bundles Server Component and Route Handler dependencies unless the package is listed in serverExternalPackages.

Good to know: A package cannot appear in both transpilePackages and serverExternalPackages; Next.js throws at build start if it does. Packages listed in optimizePackageImports and the entries in default-transpiled-packages.json are added automatically; you do not need to repeat them.

Version History