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Install node modules before copying over your working code so that node_modules are built (and cached) before you change your service code!
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|ADD package.json /tmp/package.json|
|RUN cd /tmp && npm install && \|
|mkdir -p /opt/app && cp -a /tmp/node_modules /opt/app/|
|ADD . /opt/app|
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For those like myself who were initially bewildered by this, the "Build cache" section of the Dockerfile best practices doc may help fill in the gaps.