Metro Guide

Native

If you're using a monorepo, you probably want to use this Metro configuration in your metro.config.js:

metro.config.js

// Learn more https://docs.expo.io/guides/customizing-metro
const { getDefaultConfig } = require('expo/metro-config')
/** @type {import('expo/metro-config').MetroConfig} */
const config = getDefaultConfig(__dirname, {
// [Web-only]: Enables CSS support in Metro.
isCSSEnabled: true,
})
// Expo 49 issue: default metro config needs to include "mjs"
// https://github.com/expo/expo/issues/23180
config.resolver.sourceExts.push('mjs')
module.exports = config

Web support

Early support for Metro web support is here.

First install @tamagui/metro-plugin:

yarn add tamagui @tamagui/config @tamagui/metro-plugin

Then adjust your metro.config.js:

metro.config.js

// Learn more https://docs.expo.io/guides/customizing-metro
const { getDefaultConfig } = require('expo/metro-config')
/** @type {import('expo/metro-config').MetroConfig} */
const config = getDefaultConfig(__dirname, {
// [Web-only]: Enables CSS support in Metro.
isCSSEnabled: true,
})
// add nice web support with optimizing compiler + CSS extraction
const { withTamagui } = require('@tamagui/metro-plugin')
module.exports = withTamagui(config, {
components: ['tamagui'],
config: './tamagui.config.ts',
outputCSS: './tamagui-web.css',
})

If you're using Metro as your web bundler, you have to turn isCSSEnabled on. See Expo's docs .