Does cleaning the user yarn cache will affect docker image?
yarn Version 1
You can safely remove cache files, it will not affect your application. There's even a dedicated command for that:
$ yarn cache cleanyarn Version 2
With Plug'n'Play, however, clearing the cache will very likely break your application because dependencies are no longer placed in node_modules. Here's what the documentation says:
In this install mode (now the default starting from Yarn v2), Yarn generates a single .pnp.js file instead of the usual node_modules. Instead of containing the source code of the installed packages, the .pnp.js file contains a map linking a package name and version to a location on the disk, and another map linking a package name and version to its set of dependencies. Thanks to this efficient system, Yarn can tell Node exactly where to look for files being required - regardless of who asks for them!
The location on the disk is cache.
You can get the old behavior back by placing this in your .yarnrc.yml file.
nodeLinker: node-modulesRead more about Plug'n'Play here