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Given the following Dockerfile and package.json, how do I get my image to only have what is defined as production dependencies in the package.json and the one additional dependency defined in the RUN --no-save layer, but not any of the development dependencies?

FROM node:16.14.2-alpine3.15
WORKDIR /opt/asd
COPY ./package.json .
RUN npm install --production
RUN npm install --no-save typescript

{
  "devDependencies": {
    "express": "4.17.3"
  },
  "dependencies": {
    "ramda": "0.28.0"
  }
}

Running docker build . produces an image that has node_modules containing not only the deps I wanted but also the development dependencies. What do I need to change in the Dockerfile to avoid this?

jka
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  • you also should set NODE_ENV=production ref: https://stackoverflow.com/questions/9268259/how-do-you-prevent-install-of-devdependencies-npm-modules-for-node-js-package – Victor Nogueira Jul 02 '22 at 23:45

1 Answers1

1

You can use bash conditionals syntax, but you also need to define $NODE_ENV as environment variable:

RUN if [ "$NODE_ENV" = "production" ]; \
    then npm install --only=production; \
    else npm install; \
    fi
Rouzbeh Mozafari
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