"Unable to resolve module" from dependency

[jeromecovington]

In this case, I am requiring request-promise, but when I start the react native project, I get the error:
Unable to resolve module x. If you are sure the module is there, try restarting the packager.

This error is reported for many of the required dependencies of the request dependency of request-promise. I have restarted the packager as well as removing node_modules and reinstalling. In general, what does this error stem from and in the specific, what can be done to solve it?

[jeromecovington]

For example, a representative sample from errors logged in terminal:

Unable to resolve module net from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/node_modules/tough-cookie/lib/cookie.js
Unable to resolve module url from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/node_modules/tough-cookie/lib/cookie.js
Unable to resolve module punycode from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/node_modules/tough-cookie/lib/cookie.js
Unable to resolve module punycode from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/node_modules/tough-cookie/lib/pubsuffix.js
Unable to resolve module util from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/node_modules/tough-cookie/lib/memstore.js
Unable to resolve module crypto from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/lib/helpers.js
Unable to resolve module http from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/request.js
Unable to resolve module https from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/request.js
Unable to resolve module url from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/request.js
Unable to resolve module util from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/request.js
Unable to resolve module stream from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/request.js
Unable to resolve module zlib from /Users/jcovingt/vogue-clutch/node_modules/request-promise/node_modules/request/request.js

These all appear to be node core modules. Are there known issues with dependencies that require node core modules breaking the packager?

[jeromecovington]

See - #1871

[zsszatmari]

+1

[skevy]

Hey everyone, can you all try:

1. upgrading to latest RN
2. watchman watch-del-all
3. rm -rf $TMPDIR/react-native-packager-*
4. restart the packager

And let me know if that fixes the issue?

[deminoth]

Checkout #4062.

[satya164]

@skevy May be we should add these steps to react-native upgrade?

[skevy]

@satya164 seems reasonable to me.

[satya164]

Node core modules cannot be used inside React Native as it's a completely different environment. closing this.

[abeauvois]

+1 @skevy

[ovpv]

My development is stuck at this error. i have researched a lot on this but i found no perfect solution for this! Moreover , it is quite surprising to find an issue not resolved for the span of more than a year.

please guys, do share if you find any solution for this.

[faogustavo]

Any solution? I'm stuck on this. :/

[dsapoetra]

I'm stuck at this too, hoping someone could give any advice/clue on this

[mpm]

I came here after having trouble importing the a Wordpress REST API wrapper for node.js.
I had the same issue with unable to resolve module url. I took inspiration from a similar issue and solved it by running

npm install --save url (and subsequentially installing a package named util as well).

As @satya164 pointed out, this will probably not work for all missing modules, but in my case it was only url and util and works now.

Pay attention to the react error screen to find out what other modules are missing.

[phantom1299]

There is a blog post in medium explaning how to use core node modules with react-native:
https://medium.com/@aakashns/using-core-node-js-modules-in-react-native-apps-64acd4d07140

Maybe it helps

[ps06756]

Why do you people close issues, if there is no clearly identified solution to the problem, and there are so many people facing the same issue ?