react-native-bundle-visualizer
See what's inside of your react-native bundle
Uses the awesome source-map-explorer to visualize the output of the Metro bundler.
Purpose
Sometimes, importing a single javascript library can drastically increase your bundle size. This package helps you to identify such a library, so you can keep the bundle size low and loading times fast.
Usage
Make sure npx is installed and run the following command in your project root
npx react-native-bundle-visualizer
Or install as a dev-dependency
yarn add --dev react-native-bundle-visualizerAnd run it:
yarn run react-native-bundle-visualizer
or when using npm:
npm install --save-dev react-native-bundle-visualizer ./node_modules/.bin/react-native-bundle-visualizer
Command line arguments
All command-line arguments are optional. By default a production build will be created for the ios platform.
| Option | Description | Example |
|---|---|---|
platform |
Platform to build (default is ios) | --platform ios |
dev |
Dev or production build (default is false) | --dev false |
entry-file |
Entry-file (when omitted tries to auto-resolve it) | --entry-file ./index.ios.js |
bundle-output |
Output bundle-file (default is tmp) | --bundle-output ./myapp.bundle |
format |
Output format html, json or tsv (default is html) (see source-map-explorer options) | --format json |
only-mapped |
Exclude "unmapped" bytes from the output (default is false). This will result in total counts less than the file size. | --only-mapped |
verbose |
Dumps additional output to the console (default is false) | --verbose |
reset-cache |
Removes cached react-native files (default is false) | --reset-cache |
--expo |
Set this to true/ false based on whether using expo or not. For eg, set --expo true when using expo. Not required to pass this for react-native cli. (default is false) |
--expo false |
Use react-native-bundle-visualizer@2 when targetting Expo SDK 40 or lower.
Version compatibility
| Version | Comments |
|---|---|
| 3.x | Compatible with React-Native CLI bootstrapped projects and Expo SDK 41 or higher. |
| 2.x | Compatible with React-Native CLI bootstrapped projects and Expo SDK 40 or earlier. |
| 1.x | Uses the Haul bundler instead instead of the Metro output. |