Metro Bundler cannot find .hidden.js files.

[mafelix]

🐛 Bug Report

• Everytime I tried to compile a release build for android, the bundler would always error at the same point - unable to resolve a require('../.env.js') statement in one of the component files.

• I have double checked the filepath - it is correct.

• I have double checked the metro/src/blacklist.js - there is no explicit blacklist of hidden javascript files.

• The hidden file is in the rootProject directory - It should be picked up and not 'outside' the project

• The metro bundler picks up the .env.js file in developer mode though, just not in release. I ended up having to unhide the file for the bundler to pick it up and compile a release apk.

• I should note that I recently upgraded from react native 0.38 => react-native 0.59.1. So maybe the upgrade process is the reason why the ./gradlew assembleRelease doesn't work with the hidden env file.

To Reproduce

• Compile a release.apk that has an import / require to a valid hidden js file

Expected Behavior

• Development behaviour should mimic release behaviour behaviour as much as possible. If the metro bundler picks up the hidden env file in development, it should always pick it up during the release compile process.

Code Example

Environment

info
  React Native Environment Info:
    System:
      OS: macOS 10.14.1
      CPU: (8) x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
      Memory: 26.19 MB / 16.00 GB
      Shell: 3.2.57 - /bin/bash
    Binaries:
      Node: 11.9.0 - /usr/local/bin/node
      npm: 6.5.0 - /usr/local/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    SDKs:
      iOS SDK:
        Platforms: iOS 12.1, macOS 10.14, tvOS 12.1, watchOS 5.1
      Android SDK:
        API Levels: 21, 22, 23, 24, 25, 26, 27, 28
        Build Tools: 23.0.1, 23.0.3, 25.0.2, 26.0.0, 26.0.1, 26.0.2, 26.0.3, 27.0.0, 27.0.1, 27.0.2, 27.0.3, 28.0.0, 28.0.0, 28.0.0, 28.0.1, 28.0.2, 28.0.3
        System Images: android-19 | Google APIs Intel x86 Atom, android-21 | Google APIs Intel x86 Atom, android-22 | Google APIs Intel x86 Atom, android-23 | Google APIs Intel x86 Atom, android-24 | Google APIs Intel x86 Atom, android-25 | Google APIs Intel x86 Atom, android-26 | Google APIs Intel x86 Atom, android-27 | Google APIs Intel x86 Atom, android-28 | Google APIs Intel x86 Atom
    IDEs:
      Android Studio: 3.3 AI-182.5107.16.33.5314842
      Xcode: 10.1/10B61 - /usr/bin/xcodebuild
    npmPackages:
      react: 16.8.3 => 16.8.3
      react-native: 0.59.1 => 0.59.1
    npmGlobalPackages:
      eslint-plugin-react-native: 3.6.0
      pushwoosh-react-native-plugin: 5.13.1
      react-native-app-auth: 2.6.1
      react-native-cli: 2.0.1
      react-native-git-upgrade: 0.2.7
      react-native-map: 0.0.1
      react-native-permissions: 0.2.5
      react-native-rename: 2.2.2

package.json dependencies:

"dependencies": {
    "@babel/core": "^7.1.2",
    "create-react-class": "^15.6.3",
    "metro-react-native-babel-preset": "0.51.0",
    "moment": "^2.15.1",
    "moment-timezone": "^0.5.12",
    "prop-types": "^15.7.2",
    "pushwoosh-react-native-plugin": "^5.13.1",
    "react": "16.8.3",
    "react-native": "0.59.1",
    "react-native-camera": "git://github.com/react-native-community/react-native-camera.git#fd87a3475aedf64243fc0cc5f225dcbf2484bbab",
    "react-native-datepicker": "^1.7.2",
    "react-native-deprecated-custom-components": "^0.1.2",
    "react-native-device-info": "^0.24.3",
    "react-native-dismiss-keyboard": "^1.0.0",
    "react-native-drawer-layout": "^2.0.0",
    "react-native-keyboard-spacer": "^0.4.1",
    "react-native-maps": "^0.23.0",
    "react-native-timer": "^1.3.6",
    "react-timer-mixin": "^0.13.4"
  }

[react-native-bot]

Can you run react-native info and edit your issue to include these results under the Environment section?

If you believe this information is irrelevant to the reported issue, you may write `[skip envinfo]` alongside an explanation in your Environment: section.

[cpojer]

This issue has been moved to facebook/metro#376.