Neutrino Loader Merge Middleware

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neutrino-middleware-loader-merge is Neutrino middleware for easily performing a deep merge of options into a named rule and named loader in a Neutrino configuration.


  • Node.js v6.9+
  • Yarn or npm client
  • Neutrino v5


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


❯ yarn add neutrino-middleware-loader-merge


npm install --save neutrino-middleware-loader-merge


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

const loaderMerge = require('neutrino-middleware-loader-merge');

neutrino.use(loaderMerge('compile', 'babel'), {
  plugins: ['object-rest-spread']

// Equivalent to:
    .tap(options => require('deepmerge')(options, {
      plugins: ['object-rest-spread']

This middleware is a factory intended to be invoked with a rule name and a loader name for which to extend the options. Upon invoking, it will return a middleware function to be provided to Neutrino's use() method.

const middleware = loaderMerge(ruleName, loaderName);

neutrino.use(middleware, options);


neutrino-middleware-loader-merge does not create any of its own conventions; it is only middleware for extending the options for a rule loader which has create its own conventions.


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

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