An example of a multi step Dockerfile

dockerfile_multi_step

# build environment
FROM node:10.15.3-alpine as builder
WORKDIR /usr/src/app
ENV PATH /usr/src/app/node_modules/.bin:$PATH
COPY ./package.json ./
RUN npm install
COPY . .
RUN npm run build

# production environment
FROM nginx:1.13.9-alpine
RUN rm -rf /etc/nginx/conf.d
RUN mkdir -p /etc/nginx/conf.d
COPY ./default.conf /etc/nginx/conf.d/
COPY --from=builder /usr/src/app/out /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]