TypeError: Class extends value undefined is not a constructor or null about next-learn HOT 7 CLOSED

Is your code identical to the working examples here?

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I had added more modules but recreating package-lock.json and node_modules fixed my problem and I was able to deploy to Vercel

from next-learn.

i have a problem like this too

error - Error [TypeError]: Class extends value undefined is not a constructor or null
at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/file.js (evalmachine.:5724:19)
at __require (evalmachine.:14:50)
at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/formdata.js (evalmachine.:5881:49)
at __require (evalmachine.:14:50)
at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/body.js (evalmachine.:6094:35)
at __require (evalmachine.:14:50)
at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/response.js (evalmachine.:6510:49)
at __require (evalmachine.:14:50)
at (evalmachine.:11635:30)
at requireFn (file://C:\Users\Bayram\Desktop\nextapi\node_modules\next\dist\compiled\edge-runtime\index.js:1:7079) {
middleware: true

from next-learn.

i have a problem like this too

error - Error [TypeError]: Class extends value undefined is not a constructor or null at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/file.js (evalmachine.:5724:19) at __require (evalmachine.:14:50) at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/formdata.js (evalmachine.:5881:49) at __require (evalmachine.:14:50) at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/body.js (evalmachine.:6094:35) at __require (evalmachine.:14:50) at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/response.js (evalmachine.:6510:49) at __require (evalmachine.:14:50) at (evalmachine.:11635:30) at requireFn (file://C:\Users\Bayram\Desktop\nextapi\node_modules\next\dist\compiled\edge-runtime\index.js:1:7079) { middleware: true

same, happening after upgraded to next 13

from next-learn.

i have a problem like this too

error - Error [TypeError]: Class extends value undefined is not a constructor or null at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/file.js (evalmachine.:5724:19) at __require (evalmachine.:14:50) at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/formdata.js (evalmachine.:5881:49) at __require (evalmachine.:14:50) at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/body.js (evalmachine.:6094:35) at __require (evalmachine.:14:50) at ../../node_modules/.pnpm/[email protected]/node_modules/undici/lib/fetch/response.js (evalmachine.:6510:49) at __require (evalmachine.:14:50) at (evalmachine.:11635:30) at requireFn (file://C:\Users\Bayram\Desktop\nextapi\node_modules\next\dist\compiled\edge-runtime\index.js:1:7079) { middleware: true

Upgrading node fixes this. Check: vercel/next.js#42729

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Updating Node version didn't work for me, I had to remove next 13 middleware.ts under src folder, and created custom server.js for handling middlewares. The issue then resolved for me .

from next-learn.

@maniatoffl It seems you need to use node v16.4 at least in order to use a middleware.ts file as I did.

Source: https://stackoverflow.com/questions/74739282/next-js13-middleware-occurs-typeerror-class-extends-value-undefined-is-not-a-c

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