Next build stuck on "Creating an optimized production build" forever

Fri, 20 Jun 2025 00:00:00 +0000

Problem

next build stuck on “Creating an optimized production build” forever, with no useful logs.

$ npm run build --verbose
npm verbose cli /nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/bin/node /nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/bin/npm
npm info using npm@10.9.2
npm info using node@v22.14.0
npm verbose title npm run build
npm verbose argv "run" "build" "--loglevel" "verbose"
npm verbose logfile logs-max:10 dir:/home/cuso4d/.npm/_logs/2025-06-20T11_37_08_833Z-
npm verbose logfile /home/cuso4d/.npm/_logs/2025-06-20T11_37_08_833Z-debug-0.log

> assistant-ui-starter@0.1.0 build
> next build

 ▲ Next.js 15.3.1
 - Environments: .env

 Creating an optimized production build ...

The log file produced:

0 verbose cli /nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/bin/node /nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/bin/npm
1 info using npm@10.9.2
2 info using node@v22.14.0
3 silly config load:file:/nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/lib/node_modules/npm/npmrc
4 silly config load:file:/home/cuso4d/source/sci-assistant-frontend/.npmrc
5 silly config load:file:/home/cuso4d/.npmrc
6 silly config load:file:/nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/etc/npmrc
7 verbose title npm
8 verbose argv
9 verbose logfile logs-max:10 dir:/home/cuso4d/.npm/_logs/2025-06-20T11_57_26_719Z-
10 verbose logfile /home/cuso4d/.npm/_logs/2025-06-20T11_57_26_719Z-debug-0.log
11 verbose cwd /home/cuso4d/source/sci-assistant-frontend
12 verbose os Linux 6.12.33
13 verbose node v22.14.0
14 verbose npm v10.9.2
15 verbose exit 1
16 verbose code 1

Many mentioned “You can’t have both dev and build at the same time.” source, though it is not my case.

Nextjs on CuSO4_Deposit

Next build stuck on "Creating an optimized production build" forever

Problem