javascript - Vercel Serverless Function crashing due to Cannot find module 'vartaskbackendnode_modulesaxiosdistnodeaxios

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I have an issue with importing axios in Vercel Serverless Functions. The function breaks depending on the way I import axios. I have created a discussion on vercel, a github issue and also created a reproducible demo repository. I find it annoying that I have to switch the way I import axios when I want the function to run locally (dev) and deploy without breaking.
I would like to know if there is a proper solution to this.

Endpoint	Dev (Node 14.15.1) & (Node 18.15.0)	Deploy (Node 18.x)
/api/axios-break	Working	Not working
/api/axios-work	Not working	Working

I have an issue with importing axios in Vercel Serverless Functions. The function breaks depending on the way I import axios. I have created a discussion on vercel, a github issue and also created a reproducible demo repository. I find it annoying that I have to switch the way I import axios when I want the function to run locally (dev) and deploy without breaking.
I would like to know if there is a proper solution to this.

Endpoint	Dev (Node 14.15.1) & (Node 18.15.0)	Deploy (Node 18.x)
https://vercel-serverless-axios-issue.vercel.app/api/axios-break	Working	Not working
https://vercel-serverless-axios-issue.vercel.app/api/axios-work	Not working	Working

For axios-work I import axios like import axios from 'axios/dist/node/axios.cjs';
It works after deploying but breaks in dev giving below error

Error: Function `api/axios-work.js` failed with exit code 1
Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './dist/node/axios.cjs' is not defined by "exports" in E:\vercel-serverless-axios-issue\node_modules\axios\package.json
    at throwExportsNotFound (internal/modules/esm/resolve.js:290:9)
    at packageExportsResolve (internal/modules/esm/resolve.js:513:3)
    at resolveExports (internal/modules/cjs/loader.js:432:36)
    at Function.Module._findPath (internal/modules/cjs/loader.js:472:31)
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:867:27)
    at Function.Module._resolveFilename.sharedData.moduleResolveFilenameHook.installedValue [as _resolveFilename] (C:\Users\ASUS\AppData\Roaming\npm\node_modules\vercel\node_modules\@cspotcode\source-map-support\source-map-support.js:811:30)
    at Function.Module._load (internal/modules/cjs/loader.js:725:27)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (E:\vercel-serverless-axios-issue\api\axios-work.js:1:1) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}
Error: Function `api/axios-work.js` failed with exit code 1

For axios-break I import axios like import axios from 'axios';
It works in dev but breaks after deploying giving below error

Cannot find module '/var/task/node_modules/axios/dist/node/axios.cjs'
Did you forget to add it to "dependencies" in `package.json`?
RequestId: c1845ce2-d588-4f0a-a478-95bfafacf92b Error: Runtime exited with error: exit status 1
Runtime.ExitError

• javascript
• node.js
• axios
• es6-modules
• vercel

Share Improve this question Follow edited Apr 10, 2023 at 15:38 cmgchess asked Mar 22, 2023 at 15:03 cmgchesscmgchess 10.3k4242 gold badges5353 silver badges6969 bronze badges 5

• 1 Happening to me too! Did you find a fix? – jetlej Commented Apr 7, 2023 at 3:58
• @jetlej no i just went with the weird import when deploying and change back in dev when i want. i also asked in their discussion but didn't get an answer – cmgchess Commented Apr 7, 2023 at 4:01
• @jetlej vercel is looking at the issue. hope there will be a resolution – cmgchess Commented Apr 19, 2023 at 15:54
• same here with @vercel/postgres, just change the import in the way he's looking for it and the production works – colo Commented Sep 27, 2023 at 12:51
• 1 @colo github./cmgchess/vercel-serverless-axios-issue/pull/2 this is how I kinda fixed it. Didn't test with local tho. But production worked – cmgchess Commented Sep 27, 2023 at 16:45

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1 Answer 1

Sorted by: Reset to default 1

I faced the same issue (with axios and postgres @vercel/postgres) after switching from ts to js for index script.

It took two things:

• add "type":"module" to package.json
• replace require by import

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