# Pin specific version for stability
# Use alpine for reduced image size
FROM node:19.4-alpine as dev

# Specify working directory other than /
WORKDIR /usr/src/app

# Copy only files required to install
# dependencies (better layer caching)
COPY package*.json ./

# Install only production dependencies
# Use cache mount to speed up install of existing dependencies
RUN --mount=type=cache,target=/usr/src/app/.npm \
  npm set cache /usr/src/app/.npm && \
  npm install

# Copy remaining source code AFTER installing dependencies. 
# Again, copy only the necessary files
COPY . .

# Indicate expected port
EXPOSE 3000

CMD [ "npm", "run", "dev" ]