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    Rollup compatible bundler, designed to be used in development, while Rollup is used to generate a production build.


    • Rollup is excellent, but during development it can be a bit slow as it's performing unnecessary build steps (tree-shaking).
    • When making changes to files, Rollup has to recompile the entire bundle due to the tree-shaking optimisations. This can lead to slow rebuild times.
    • Wanted something similar to Webpack development flow, but with the simplicity of the Rollup configuration and plugin ecosystem.
    • To give developers a foundation for implementing Hot Module Replacement when using Rollup.
    • While Rollup does have watching functionality, it writes to disk and isn't intended to be used in-memory.

    What does this do?

    • Nollup doesn't attempt to do any optimisations, it simple concatenates all of the modules together with simple function wrappers.
    • ES6 import and export statements are detected and replaced with an internal module loader.
    • Each module is wrapped in an eval call with source maps.
    • Compatible with Rollup plugins, so you can use one single Rollup configuration for both development and production. Make sure the plugin uses emitAsset instead of writing to disk.
    • Detects changed files, and performs a rebuild and has support for Hot Module Replacement.


    See examples directory on how to use.


    Nollup provides a dev server which can be used as a CLI command.

        "scripts": {
            "start": "nollup -c"

    See "Nollup Options" for list of available flags.


    Configuration file that can be used to pass configuration instead of as flags through the CLI.

        "hot": true,
        "contentBase": "./public"

    A JavaScript file called .nolluprc.js can be used instead.

    module.exports = {
        hot: true,
        contentBase: './public'

    See "Nollup Options" for list of available options.

    Nollup Options

    • String config | -c | --config [file] - Pass a configuration file. By default it will look for rollup.config.js but can be specified otherwise.
    • String contentBase | --content-base [folder] - Folder to serve static content from. By default it will be looking in './.
    • Boolean historyApiFallback | --history-api-fallback - If set, it will fallback to index.html if accessing a route that doesn't exist.
    • Boolean hot | --hot - Enable Hot Module Replacement.
    • Number port | --port [value] - Port number to run server on. Default is 8080.
    • Boolean verbose | --verbose - If set, there's verbose logging.
    • Object proxy - Object keys are paths to match. Value is domain to redirect to. "/api": "http://localhost:8080" will have a request such as /api/todos redirect to http://localhost:8080/api/todos


    See API for information on how to use the JavaScript API.

    Rollup Plugins with Nollup Enhancements


    • Not all Rollup configuration options are supported yet.
    • Not all Rollup plugin hooks are implemented yet.
    • Sourcemaps aren't perfect yet, depends on plugin usage.
    • Does not attempt to parse "require" calls anywhere.
    • No support for live-bindings. Not sure if I want to sacrifice debugging capabilities for a feature not used often.
    • No support for circular imports.

    Contributions are welcome.




    npm i @robmarr/nollup

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    • robinmarr