[Workarounds] Packager unable to resolve module from /Users/node_modules/

There are various issues scattered around the repo related to this issue. Basically what happens is, for some packages, when you try to require some-module in a file, for example,

var someModule = require('some-module');

It is unable to resolve the package and the following error appears,

Unable to resolve module some-module from /Users/username/projectname/AwesomeProject/index.js: Invalid directory /Users/node_modules/some-module

This error message is a symptom of the packager not being able to find some-module. It'll walk up the directory tree until it finds node_modules/some-module. It just so happens that /Users is the last directory to try, hence the weird /Users/node_modules directory in the error message (h/t @philikon).

Workarounds

Currently, the workarounds seem to be,

Delete the node_modules folder - rm -rf node_modules && npm install
Reset packager cache - rm -fr $TMPDIR/react-* or node_modules/react-native/packager/packager.sh --reset-cache
Clear watchman watches - watchman watch-del-all
Recreate the project from scratch

@amasad

cc @amasad

@martinbigio

cc @martinbigio @davidaurelio @cpojer

That's really strange. Next time it happens can you list your watch roots? watchman watch-list

Do we have a consistent repro case? I've experienced this too.

Same problem here on version 0.17.0.

$ watchman watch-list
{
    "version": "3.8.0",
    "roots": []
}

I also got this problem when requesting for platform=ios

Do we have a way to recreate this? Any steps that might recreate.

I suspect that this is actually an npm bug. It seems that npm is secretly deleting installed packages in my project's node_modules directory, when I install an unrelated package. When it blows up with an error, it references /Users/node_modules/ because (I'm guessing) it's just searching up the directory tree 3-4 levels before giving up.

re-running npm install <module> —save for each of the missing modules fixes this issue for me.

edit: My guess is that React Native's complex dependency structure is just exposing npm's bugs.

edit 2: Yeah, you pretty much want to blow away your project's node_modules directory and do a fresh npm install. I think the issue is extra common if you depend on modules that React Native also depends on (say, lodash). npm just gets into a weird state with all the, ahem, flux :).

Is this only seen in npm 3?

npm 3 uses flat dependency structure. essentially node_modules are not resides in individual packages but only on the top level. if we have references like {somepackage}/node_modules/... we will have issue. Does it ring any bells?

I'm using npm 3.5.2. I'm not sure if it applies to npm 2.

I don't think we've tested on npm 3. Although the node resolution algorithm (which we implement) should still work. Are all of you seeing this using npm 3?

@jiang-yi-siphty

@jiang-yi-siphty when you try the react-native option for presets, what kind of error do you receive?

i fix it by:

xcode open "yourReactNativeProject/ios"
run Product -> Clean
After Clean success, run Product -> Build
fix all Build error
work!

i think it cause by we had doing some wrong script and it had edit some xcode setting file that git ignored, so we can not easier to solve it by revert or rebuild the project.

Hello,
I have installed firebase in react-native using command " npm install --save firebase" then whenever i import " import firebase from 'firebase'; " below error shows up i have tried also installing 'react-native-firebase' but it doesn't work that well.

I have got this error as below during running my application on device :

EDIT:
The error which shown above is solved by rollbacking to firebase version 5.0.4 to 5.0.3.
As an extra information i found out that firebase@5.0.4 run smoothly on ios but it is not much compatible to android at this time. Therefore if any body wants to use it on android they can install firebase by command:

" npm i --save firebase@5.0.3 "

Thank you

This just happened to me because VSCode had erroneously inserted import { Utils } from "handlebars" into one of my files. Super cryptic error message though:

Removing the import statement fixed it.

Locking as recent activity appears unrelated to the original discussion around what caused the packager to fail in this manner. Now that the packager has moved to https://github.com/facebook/metro, we might want to move the discussion to an issue on that repo instead.

Please continue discussion over at https://github.com/facebook/metro

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[Workarounds] Packager unable to resolve module from /Users/node_modules/ #4968

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[Workarounds] Packager unable to resolve module from /Users/node_modules/ #4968

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brentvatne commented on Dec 24, 2015

amasad commented on Dec 25, 2015

amasad commented on Dec 25, 2015

hufeng commented on Dec 25, 2015

martinbigio commented on Dec 25, 2015

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amasad commented on Dec 26, 2015

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