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@moxy/next-compile-node-modules

v2.1.1

Published

Next.js plugin to compile all node_modules using Babel

Downloads

80

Readme

next-compile-node-modules

NPM version Downloads Build Status Coverage Status Dependency status Dev Dependency status

Next.js plugin to compile all node_modules using Babel.

Motivation

Package authors should publish any JavaScript code to npm as long as it's only pure valid JavaScript (any version). It doesn't make sense to compile at the package level because authors don't know in which context their packages will be used. For instance, a package that has been published with code compiled to ES5 may be used in app that only targets evergreen browsers, making the bundle unnecessarily larger (or vice-versa).

Instead, app developers should compile node_modules using babel-preset-env and instruct it to produce compatible for the browsers they want to support (e.g. "IE 11"). Popular boilerplate projects such as create-react-app now compile all node_modules and you should too!

This plugin changes Next.js's webpack config to compile all node_modules by default. While this has an impact on performance, it only slows down the first compilation and subsequent ones will be much faster thanks to the built-in cache.

Installation

$ npm i --save @moxy/next-compile-node-modules

Usage

// next.config.js
const withCompileNodeModules = require('@moxy/next-compile-node-modules');

module.exports = withCompileNodeModules({ ...options })({ ...nextConfig });

Multiple configurations can be combined together with function composition. For example:

// next.config.js
const withCSS = require('@zeit/next-css');
const withCompileNodeModules = require('@moxy/next-compile-node-modules');

module.exports = withCSS(
    withCompileNodeModules({
        exclude: [require.resolve('some-module')],
    })({
        cssModules: true, // this options will be passed to withCSS plugin through nextConfig
    }),
);

Available options

| Option | Description | Type | Default | | --- | --- | --- | --- | | test | The Webpack rule test condition | Rule.test | /\.js$/ | | include | The Webpack rule include condition | Rule.include | /[\\/]node_modules[\\/]/ | | exclude | Prepend exclusions to the Webpack rule exclude condition besides the built-in¹ ones | Rule.exclude | | | serverExternals | Prepend additional externals dependencies besides the built-in² ones. This option is ignored in the client build or when target is serverless | Any supported types

¹ Built-in exclusions are Next.js and Webpack related, such as node-libs-browser and process.

² Built-in externals are Next.js related as well as modules associated with React. More specifically, it prevents React from being bundled individually in each page which would cause issues such as "React Hooks would throw: Invalid Hook Call Warning".

Custom babel config

If you are using a custom babel.config.js, you may identify if we are compiling a node module or not via api.caller like so:

// babel.config.js

module.exports = (api) => {
    const isNodeModule = api.caller((caller) => caller.isNodeModule);

    // You may now use `isNodeModule` to conditionally make changes to the returned config

    return {
        // ...
    };
};

Tests

Any parameter passed to the test command, is passed down to Jest.

$ npm t
$ npm t -- --watch # during development

License

Released under the MIT License.