anchor.diff:  
   # RUN /bin/bash -lc 'yarn global add json-server'
   # RUN /bin/bash -lc 'yarn global add now'
  +
  +RUN echo "unsafe-perm = true" >> ~/.npmrc
  
positive.code: RUN apt-fast update && apt-fast install --no-install-recommends -y yarn
  
  RUN \
  	apt-fast autoremove -y && \
  	apt-fast autoclean && \
  	rm -rf /var/lib/apt/lists/*
  
  RUN /bin/bash -lc 'npm install -g yarn'
  
  
negative.code:     # echo ". ~/.config/fish/nvm-wrapper/nvm.fish" >> ~/.config/fish/config.fish
  
  # npm
  ENV NODE_VERSION 12.4.0
  RUN cp -f ~/.nvm/nvm.sh ~/.nvm/nvm-tmp.sh && \
      echo "nvm install v$NODE_VERSION" >> ~/.nvm/nvm-tmp.sh && \
      echo "nvm alias 12 $NODE_VERSION" >> ~/.nvm/nvm-tmp.sh && \
      echo "nvm alias default 12" >> ~/.nvm/nvm-tmp.sh && \
      echo "nvm use default" >> ~/.nvm/nvm-tmp.sh && \
      sh ~/.nvm/nvm-tmp.sh && \
      rm ~/.nvm/nvm-tmp.sh && \
  