Next.js 9.4.0 full build error: "ReferenceError: fetch is not defined"

[SirensOfTitan]

Anyone else getting this? I've removed isomorphic-unfetch after upgrading to 9.4.0, but I cannot get a clean build.

I get:

Compiled successfully.

ReferenceError: fetch is not defined
   [...truncated useless part of stack]
    at Module._compile (internal/modules/cjs/loader.js:1151:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1171:10)
    at Module.load (internal/modules/cjs/loader.js:1000:32)
    at Function.Module._load (internal/modules/cjs/loader.js:899:14)
    at Module.require (internal/modules/cjs/loader.js:1040:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at hasCustomGetInitialProps (/home/cole/Code/hipri/app/node_modules/next/dist/build/utils.js:25:1023)
    at /home/cole/Code/hipri/app/node_modules/next/dist/build/index.js:13:3589
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async Promise.all (index 1)

It's odd, because I do get that "Compiled successfully" message before this error gets thrown. fetch looks like a properly defined global, and dev mode works fine with both SSR and browser render.

I've tried progressively removing parts of my next.js config and .babelrc and the error still persists.

[jamesmosier]

Have you tried removing your node_modules and .next folder? Afterwards try reinstalling your node_modules and rebuilding? I've found that to be useful when Next isn't quite doing what I would expect.

[timneutkens]

Just fixed this issue in #12832

It'll be out on next@canary in about 15mins: https://github.com/zeit/next.js/releases/tag/v9.4.1-canary.2

[sebadiaz-arg]

Hi, I've got same error and, after several hours looking for a solution, I've solved it doing this:
-Running: npm install node-fetch (from command line)
-Adding this line into the file where a use the fetch() function: import fetch from "node-fetch";

Good luck!