November 20, 2018

581 words 3 mins read



Haul is a command line tool for developing React Native apps, powered by Webpack

repo name callstack/haul
repo link
language TypeScript
size (curr.) 9346 kB
stars (curr.) 3257
created 2017-03-20
license MIT License

Build Status MIT License

PRs Welcome Code of Conduct

Chat tweet

Haul is a drop-in replacement for react-native CLI built on open tools like Webpack. It can act as a development server or bundle your React Native app for production.

@haul-bundler/cli and other packages under @haul-bundler scope are a overhaul of haul package and support only React Native 0.59.0 and above. If you need to support older versions, please check legacy branch.

@haul-bundler/cli and other packages requires Node 10 to be installed. If you’re running older version, please upgrade to Node 10 LTS or newer.


  • Replaces React Native packager to bundle your app
  • Access to full webpack ecosystem, using additional loaders and plugins is simple
  • Doesn’t need watchman, symlinks work nicely
  • Helpful and easy to understand error messages


Name Version Description Required
@haul-bundler/cli cli version CLI and commands implementation. Yes
@haul-bundler/core core version Core logic and functionality. Yes (installed with cli)
@haul-bundler/core-legacy core-legacy version Legacy logic from haul package Yes (installed with cli)
@haul-bundler/babel-preset-react-native babel-preset-react-native version Babel preset tweaked for RN 0.59+, which can decrease the bundle size by using only the necessary transforms. Yes (installed by init command)
@haul-bundler/basic-bundle-webpack-plugin basic-bundle-webpack-plugin version Webpack plugin with tweaks for plain JS bundle. Yes (installed with cli)
@haul-bundler/ram-bundle-webpack-plugin ram-bundle-webpack-plugin version Webpack plugin for RAM bundle support. Yes (installed with cli)
@haul-bundler/preset-0.59 preset-0.59 version Preset with configuration tweaked for RN 0.59. Yes (installed by init command when using RN 0.59)
@haul-bundler/preset-0.60 preset-0.60 version Preset with configuration tweaked for RN 0.60. Yes (installed by init command when using RN 0.60)
@haul-bundler/inspector inspector version Haul inspector with haul-inspector binary. No (optional).
@haul-bundler/inspector-events inspector-events version Shared logic between cli and Haul inspector. Yes (installed with cli)
@haul-bundler/explore explore version Explore and analyse generated bundle No (optional)

Getting started

Start by adding Haul as a dependency to your React Native project (use react-native init MyProject to create one if you don’t have a project):

yarn add --dev @haul-bundler/cli

# Traditionalist? No problem:
npm install --save-dev @haul-bundler/cli

To configure your project to use haul, run the following:

yarn haul init
# npm >= 5.2.0 :
npx haul init
# npm < 5.2.0 :
npm install -g npx
npx haul init

This will automatically add the configuration needed to make Haul work with your app, e.g. add haul.config.js to your project, which you can customize to add more functionality.

Next, you’re ready to start the development server:

yarn haul start
# Or:
npx haul start

Finally, reload your app to update the bundle or run your app just like you normally would:

react-native run-ios


Check out the docs to learn more about available commands and tips on customizing the webpack configuration.

  1. CLI Commands
  2. Configuration
  3. Recipes
  4. Migration guide


Haul uses a completely different architecture from React Native packager, which means there are some things which don’t work quite the same.

  • Delta Bundles (RN 0.52+) have minimal support
  • Existing react-native commands
  • No support for Hot Module Replacement

The following features are unlikely to be supported in the future:

  • Haste module system: use something like babel-plugin-module-resolver instead
  • Transpile files under node_modules: transpile your modules before publishing, or configure webpack not to ignore them

Made with ❤️ at Callstack

Haul is an open source project and will always remain free to use. If you think it’s cool, please star it 🌟. Callstack is a group of React and React Native geeks, contact us at if you need any help with these or just want to say hi!

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