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Dockerfile
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Dockerfile
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#Creates a layer from node:18 image.
FROM node:18
#Sets the working directory for any RUN, CMD, ENTRYPOINT, COPY, and ADD commands
WORKDIR /usr/src/app
#Sets an environment variable
ENV PORT 3000
#Copy new files or directories into the filesystem of the container
COPY package.json /usr/src/app
COPY yarn.lock /usr/src/app
#Execute commands in a new layer on top of the current image and commit the results
RUN yarn install
##Copy new files or directories into the filesystem of the container
COPY . /usr/src/app
#Execute commands in a new layer on top of the current image and commit the results
RUN yarn run build
#Informs container runtime that the container listens on the specified network ports at runtime
EXPOSE 3000
#Allows you to configure a container that will run as an executable
ENTRYPOINT ["yarn", "run", "dev"]