I am trying to dockerize a react application. It uses craco for building since I am using tailwindcss. It was working properly until today when the build started throwing errors for CSS files.
The error
> [admin-build 7/7] RUN npm run build:
#15 1.594
#15 1.594 > admin@0.1.0 build /app
#15 1.594 > craco build
#15 1.594
#15 3.555 craco: *** Cannot find ESLint loader (eslint-loader). ***
#15 3.873 Creating an optimized production build...
#15 89.72 Failed to compile.
#15 89.72
#15 89.72 ./src/styles/index.css
#15 89.72 TypeError: Cannot convert undefined or null to object
#15 89.72 at Function.entries (<anonymous>)
#15 89.72 at Array.forEach (<anonymous>)
#15 89.72
#15 89.72
#15 89.75 npm ERR! code ELIFECYCLE
#15 89.75 npm ERR! errno 1
#15 89.76 npm ERR! admin@0.1.0 build: `craco build`
#15 89.76 npm ERR! Exit status 1
#15 89.76 npm ERR!
#15 89.76 npm ERR! Failed at the admin@0.1.0 build script.
#15 89.76 npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
#15 89.76
#15 89.76 npm ERR! A complete log of this run can be found in:
#15 89.76 npm ERR! /root/.npm/_logs/2021-06-26T14_32_59_262Z-debug.log
------
My Dockerfile
# base image
FROM node:14-alpine as admin-build
# workdir
RUN mkdir /app
WORKDIR /app
# Install dependencies
COPY package.json ./
RUN npm install
# copy source
COPY . .
# build source
RUN npm run build
# Nginx for serving
FROM nginx:alpine
# copy configs
COPY nginx.conf /etc/nginx/conf.d/default.conf
COPY --from=admin-build /app/build /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]
The application builds properly outside docker. Is there any way to fix this or at least see what the problem is?
Thanks
This was an issue with the node version in docker. I was using node 16 and npm version 7 in my local setup and in docker, it was running node-14 and npm 6. This seems to be causing problems with craco.
After updating the docker file to use node-16:alpine, It worked.