Missing yarn cache clean after yarn install DOK-P1005

yarn keeps a local cache of downloaded packages. Not cleaning cached package data after installation can result in higher image sizes. It is always recommended to clean the cached packages after installing them.

Please note that the clean-up must be performed in the same RUN step as it creates a separate layer. Doing this in a different RUN command would therefore result in a new layer, which will not help reduce the image size.

Bad Practice

RUN yarn install

Recommended

RUN yarn install && \
    yarn cache clean