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Error when using with metro only

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Bewertung

Schwierigkeit
3/5
Geschätzter Aufwand
1-2 Tage
Anfängerfreundlichkeit
40/100
Issue-Typ
Bug
Klarheit
Größtenteils klar
Aktivitätsstatus
Ruhig
Tech-Stack
javascript, react-native
Bereich
build-system, tooling

Rechercherichtung

Start with the metro.config.js from the linked example repository and reproduce the 'Cannot find module expo/package.json' error by running npm run start. The stack trace points to node_modules/@expo/metro-config/build/transform-worker/utils/moduleMapper.js, so read how that file resolves modules and why it needs expo/package.json. Done means Metro loads a config built from @expo/metro-config without installing the full expo package, or the README is corrected to say otherwise.

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Beschreibung

auto-triaged bug deferred (post-5.0) needs-deep-triage
Before submitting a new issue
  • I tested using the latest version of the library, as the bug might be already fixed.
  • I tested using a supported version of react native.
  • I checked for possible duplicate issues, with possible answers.
Bug summary

The instructions in the README.md state:

Non-Expo Projects

react-native-css relies on the bundler to process CSS files. Currently only Expo provides a CSS asset pipeline. Since the Expo SDK is modular, you can add this functionality by just using the @expo/metro-config package.

Follow the Expo instructions, but replace the expo package with @expo/metro-config.

When I try this I receive an error:

error Error loading Metro config at: metro.config.js
Cannot find module 'expo/package.json'
Require stack:
- node_modules/@expo/metro-config/build/transform-worker/utils/moduleMapper.js

Is there a specific version of @expo/metro-config I should be using? I'd like to avoid importing all of expo.

Library version

3.0.7

Environment info
System:
  OS: Linux 7.0
  CPU: 
  Memory: GB
  Shell:
    version: 5
    path: /bin/sh
Binaries:
  Node:
    version: 24.15.0
    path: 
  Yarn:
    version: 1.22.22
    path: 
  npm:
    version: 11.13.0
    path: 
  Watchman: Not Found
SDKs:
  Android SDK: Not Found
IDEs:
  Android Studio: Not Found
Languages:
  Java:
    version: 17.0.19
    path: 
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli":
    installed: 20.1.3
    wanted: ^20.1.3
  react:
    installed: 19.2.3
    wanted: ^19.2.5
  react-native:
    installed: 0.85.3
    wanted: ^0.85.3
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true
Steps to reproduce
  1. npx @react-native-community/cli@latest init reactNativeCssExample --version latest
  2. npm i --save-dev react-native-css @expo/metro-config
  3. setup metro.config.js
const { mergeConfig } = require('@react-native/metro-config');
const { getDefaultConfig } = require('@expo/metro-config');

/**
 * Metro configuration
 * https://reactnative.dev/docs/metro
 *
 * @type {import('@react-native/metro-config').MetroConfig}
 */
const config = {};

module.exports = mergeConfig(
  getDefaultConfig(__dirname),
  config
);
  1. npm run start
Reproducible example repository

https://github.com/wallzero/react-native-css-example

Vorherrschende Sprache
TypeScript
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Gemergte PRs (30 T.)
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