Neutrino Compile Loader Middleware

neutrino-middleware-compile-loader is Neutrino middleware for compiling source code with Babel.

Requirements

• Node.js v6.10+
• Yarn or npm client
• Neutrino v7

Installation

neutrino-middleware-compile-loader can be installed via the Yarn or npm clients.

Yarn

❯ yarn add neutrino-middleware-compile-loader

npm

❯ npm install --save neutrino-middleware-compile-loader

Usage

neutrino-middleware-compile-loader can be consumed from the Neutrino API, middleware, or presets. Require this package and plug it into Neutrino:

// Using function middleware format

const compile = require('neutrino-middleware-compile-loader');

neutrino.use(compile, {
  include: [],
  exclude: [],
  babel: {}
});

// Using object or array middleware format

module.exports = {
  use: [
    ['neutrino-middleware-compile-loader', {
      include: [],
      exclude: [],
      babel: {}
    }]
  ]
};

• include should be an array of paths to include in the compilation. Maps to Webpack's Rule.include
• exclude should be an array of paths to exclude from the compilation. Maps to Webpack's Rule.exclude
• babel is a Babel configuration object, consumed by babel-loader. Use this to set properties such as presets, plugins, and env.

Merging Babel Configuration

This package also exposes a function for merging Babel configurations. This comes from the babel-merge package.

const { merge } = require('neutrino-middleware-compile-loader');

const together = merge(
  {
    presets: [
      ['babel-preset-env', {
        targets: {
          browsers: ['latest 1 Chrome']
        }
      }]
    ]
  },
  {
    presets: [
      ['babel-preset-env', {
        targets: {
          browsers: ['latest 1 Firefox']
        }
      }]
    ]
  }
);

console.log(together);

// Logs:
{
  presets: [
    ['babel-preset-env', {
      targets: {
        browsers: [
          'latest 1 Chrome',
          'latest 1 Firefox'
        ]
      }
    }]
  ]
}

Customization

neutrino-middleware-compile-loader creates some conventions to make overriding the configuration easier once you are ready to make changes.

Rules

The following is a list of rules and their identifiers which can be overridden:

Contributing

This middleware is part of the neutrino-dev repository, a monorepo containing all resources for developing Neutrino and its core presets and middleware. Follow the contributing guide for details.