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Webpack file switch loader

Install with

npm i -D file-switch-loader

This loader can change the file that content is being loaded from while the bundling is happening.

Use cases can be a multi-tenant repository, AB testing or whenever you would like to switch out parts of your component tree based on a configuration object and their filenames.



The loader has to be the last in the array

  module: {
    rules: [
        test: /\.jsx?$/,
        use: [
            loader: 'file-switch-loader',
            options: {
              version: 'b',

Tree of components:

├── App.jsx
├── Button.b.css
├── Button.b.jsx
├── Button.css
├── Button.jsx
└── index.js

App.jsx is importing Button.jsx.

Now we would like to test out a new button component on our Page. In the options we have set the version option to b. The loader will now check if files with a b between filename and extension exist and load the content of those instead.

Cool stuff

You can just pass in the version via a parameter when starting webpack or have it in an ENV variable. This way you can quickly build and release different versions of your App/Site.


This was tested with node 8.6.0 but should work as long your node version supports const and string interpolation.