[FIXED] TypeError: cb.apply is not a function

Issue

I’m trying to run an existing React Native project that uses Metro Bundler. My operating system is Ubuntu 20.04 and I’ve tried to run the app both on a physical Android device and on an Android simulator that I created with Android Studio.

I have successfully cloned the project’s repo, installed its dependencies (yarn), built the app (react-native run-android), and opened the app on my phone and simulator. However, running react-native start errors out saying TypeError: cb.apply is not a function. Here is the full information and errors I get when running react-native start:

$ react-native start
warn Your project is using deprecated "rnpm" config that will stop working from next release. Please use a "react-native.config.js" file to configure the React Native CLI. Migration guide: https://github.com/react-native-community/cli/blob/master/docs/configuration.md
warn The following packages use deprecated "rnpm" config that will stop working from next release:
  - rn-fetch-blob: https://npmjs.com/package/rn-fetch-blob
Please notify their maintainers about it. You can find more details at https://github.com/react-native-community/cli/blob/master/docs/configuration.md#migration-guide.
┌──────────────────────────────────────────────────────────────────────────────┐
│                                                                              │
│  Running Metro Bundler on port 8081.                                         │
│                                                                              │
│  Keep Metro running while developing on any JS projects. Feel free to        │
│  close this tab and run your own Metro instance if you prefer.               │
│                                                                              │
│  https://github.com/facebook/react-native                                    │
│                                                                              │
└──────────────────────────────────────────────────────────────────────────────┘

warn Your project is using deprecated "rnpm" config that will stop working from next release. Please use a "react-native.config.js" file to configure the React Native CLI. Migration guide: https://github.com/react-native-community/cli/blob/master/docs/configuration.md
warn The following packages use deprecated "rnpm" config that will stop working from next release:
  - rn-fetch-blob: https://npmjs.com/package/rn-fetch-blob
Please notify their maintainers about it. You can find more details at https://github.com/react-native-community/cli/blob/master/docs/configuration.md#migration-guide.
Looking for JS files in
   /home/ggiuffre/Documents/squib/app 

Loading dependency graph, done.
 BUNDLE  [android, dev] ./index.js ░░░░░░░░░░░░░░░░ 0.0% (0/1)/home/ggiuffre/Documents/squib/app/node_modules/@react-native-community/cli/node_modules/graceful-fs/polyfills.js:285
        if (cb) cb.apply(this, arguments)
                   ^

TypeError: cb.apply is not a function
    at /home/ggiuffre/Documents/squib/app/node_modules/@react-native-community/cli/node_modules/graceful-fs/polyfills.js:285:20
    at FSReqCallback.oncomplete (fs.js:169:5)

Installing graceful-fs (as recommended by another post about the same problem) doesn’t change anything, and I still get the same error.

What could be the issue here? Thanks in advance.

Solution

I had a very similar problem on CI, but it works normally on my local machine (Node 13). In the CI, when building the project on CircleCI or on AppCenter with a code that I already released two months ago it throws the error below. It just does not make sense, it’s like node had broken dynamically.

I tested the same code with node 10, 12 and 14, but now it works just with node 10 (10.22.0).

The error I had:

/home/circleci/my-app/node_modules/@react-native-community/cli/node_modules/graceful-fs/polyfills.js:285
        if (cb) cb.apply(this, arguments)
                   ^

TypeError: cb.apply is not a function
    at /home/circleci/my-app/node_modules/@react-native-community/cli/node_modules/graceful-fs/polyfills.js:285:20
    at FSReqCallback.oncomplete (fs.js:169:5)

> Task :app:bundleReleaseJsAndAssets FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:bundleReleaseJsAndAssets'.
> Process 'command 'node'' finished with non-zero exit value 1

UPDATE

What solved my problem was to add a resolution to the package.json to do not allow any lib to use a version of graceful-fs that is before "4.2.4". Now it works again with node 12.

PS: Don’t forget to run yarn or npm run install to update your .lock. If this solution does not work for you, please add a comment to this thread related to this problem on Node 12.18.3

  "devDependencies": {
    ...
  },
  "resolutions": {
    "graceful-fs": "4.2.4"
  },

Answered By – Roni Castro

Answer Checked By – Mildred Charles (Easybugfix Admin)

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