I'm seeing a similar error with React-Native 0.52.0, but not with 0.49.0.

me too

Same here!

It's happening for me too, with MaterialCommunityIcons and MaterialIcons.
Edit: I only started encountering this issue when I updated React Native from 0.51.0 => 0.52.0.

The file it is trying to find does in fact declare that module.

This is why it breaks now:
facebook/metro#139 (comment)

Related issue:
#379

The broken file:
https://github.com/facebook/react-native/blob/master/local-cli/core/__fixtures__/files/package.json

Workaround
rm ./node_modules/react-native/local-cli/core/__fixtures__/files/package.json
restart packager

• There are some answers below for how to automate this
  • Using rn-cli.config.js
  • Using package.json

@chrismcleod Oh wow that worked wonders. Thank you

@chrismcleod genius! 😄

@chrismcleod thanks for finding!

I can workaround this for RN 0.52.0 with this rn-cli.config.js in my project root:

const blacklist = require('metro/src/blacklist')

module.exports = {
  getTransformModulePath () {
    return require.resolve('react-native-typescript-transformer')
  },
  getSourceExts () {
    return ['ts', 'tsx']
  },
  getBlacklistRE () {
  return blacklist([/react-native\/local-cli\/core\/__fixtures__.*/])
  },
}

Exact workaround is getBlacklistRE part (other is my typescript config).

I have very bad feelings last months about react-native, metro and other facebook js code, they always reinventing wheels with good intentions and badly broken implementations :-(

But to be more constructive... it will be very good if someone fill bug at react-native repo...

Got the same error with Ionicons and

rm ./node_modules/react-native/local-cli/core/__fixtures__/files/package.json

workaround fixed the issue.

Loading dependency graph, done.
warning: the transform cache was reset.
error: bundling failed: Error: While resolving module react-native-vector-icons/Ionicons, the Haste package react-native-vector-icons was found. However the module Ionicons could not be found within the package. Indeed, none of these files exist:

/home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/react-native/local-cli/core/fixtures/files/Ionicons(.native||.android.js|.native.js|.js|.android.json|.native.json|.json)
/home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/react-native/local-cli/core/fixtures/files/Ionicons/index(.native||.android.js|.native.js|.js|.android.json|.native.json|.json)
at resolveHasteName (/home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/metro/src/node-haste/DependencyGraph/ModuleResolution.js:387:9)
at ModuleResolver._resolveDependency (/home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/metro/src/node-haste/DependencyGraph/ModuleResolution.js:317:37)
at ModuleResolver.resolveDependency (/home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/metro/src/node-haste/DependencyGraph/ModuleResolution.js:313:877)
at ResolutionRequest.resolveDependency (/home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/metro/src/node-haste/DependencyGraph/ResolutionRequest.js:97:16)
at DependencyGraph.resolveDependency (/home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/metro/src/node-haste/DependencyGraph.js:269:4352)
at /home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/metro/src/DeltaBundler/traverseDependencies.js:201:36
at Generator.next ()
at step (/home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/metro/src/DeltaBundler/traverseDependencies.js:256:306)
at /home/morteza/projects/fingermenu/finger-menu-restaurant-mobile/node_modules/metro/src/DeltaBundler/traverseDependencies.js:256:536
at new Promise ()
BUNDLE [android, dev] ./index.android.js ▓▓▓▓░░░░░░░░░░░░ 30.5% (289/523), failed.

After this command rm ./node_modules/react-native/local-cli/core/fixtures/files/package.json

the application is stuck with strange error:

Unknown named module: 'react'
Module AppRegistry is not a registered callable module

@psycura
Stop the server that's running and then start it.

Its not helping.
Tried to stop and start again many times.
Forced to downgrade to previous version of RN

I added this to package.json using RN v0.52

"scripts": {
    "postinstall": "rm ./node_modules/react-native/local-cli/core/__fixtures__/files/package.json”
}