Important: This documentation covers Yarn 2. For the 1.x doc, check classic.yarnpkg.com.
Yarn
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yarn patch

This command will cause a package to be extracted in a temporary directory (under a folder named "patch-workdir"). This folder will be editable at will; running yarn patch inside it will then cause Yarn to generate a patchfile and register it into your top-level manifest (cf the patch: protocol)..

Usage

$> yarn patch <package>