Dockerfile-new

# FROM Sid Palas via Twitter
# https://twitter.com/sidpalas/status/1634194026500096000?s=20

# In specific version for stability
FROM node:12-alpine AS base

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

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

FROM base AS dev

RUN node --version && npm --version
RUN --mount=type=cache,target=/usr/scr/app/.npm \
    npm set cache /usr/src/app/.npm && \
    npm install

COPY . .

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

FROM base AS production

# Set NODE_ENV
ENV NODE_ENV production

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

# Use non-root user
# Use --chown on COPY commands to set file permissions
USER node

# Copy remaining source code AFTER installing dependencies.
# Again, copy only necessary files
COPY --chown=node:node ./src/ .

# Indicate expected port
EXPOSE 3000

CMD ["node", "index.js"]