@expo/metro-config

What is @expo/metro-config?

@expo/metro-config is a configuration package for Metro, the JavaScript bundler used by React Native. It provides a set of default configurations optimized for Expo projects, making it easier to set up and customize the Metro bundler for your React Native applications.

What are @expo/metro-config's main functionalities?

Default Configuration

This feature provides a default configuration for Metro bundler, optimized for Expo projects. It simplifies the setup process by providing sensible defaults.

const { getDefaultConfig } = require('@expo/metro-config');

const defaultConfig = getDefaultConfig(__dirname);

module.exports = defaultConfig;

Custom Configuration

This feature allows you to customize the default Metro configuration. For example, you can add custom file extensions to the resolver.

const { getDefaultConfig } = require('@expo/metro-config');

const defaultConfig = getDefaultConfig(__dirname);

defaultConfig.resolver.sourceExts.push('cjs');

module.exports = defaultConfig;

Asset Plugins

This feature allows you to add custom asset plugins to the Metro configuration. For example, you can add a plugin to hash asset files.

const { getDefaultConfig } = require('@expo/metro-config');

const defaultConfig = getDefaultConfig(__dirname);

defaultConfig.transformer.assetPlugins = ['expo-asset/tools/hashAssetFiles'];

module.exports = defaultConfig;

Other packages similar to @expo/metro-config

metro-config

metro-config is the official configuration package for Metro bundler. It provides a flexible way to customize the Metro bundler for React Native projects. Unlike @expo/metro-config, it does not come with Expo-specific defaults.

haul

haul is an alternative JavaScript bundler for React Native that offers more customization options compared to Metro. It can be used as a replacement for Metro and provides its own set of configuration options, making it more flexible but also more complex to set up.

README

expo-metro-config

A Metro config for running React Native projects with the Metro bundler.