Change record status: 
Project: 
Introduced in branch: 
9.3.x
Introduced in version: 
9.3.0
Description: 

The eslint-plugin-yml plugin has been added to ESLint and the core precommit script to ensure all YAML in the codebase is well formed.

Running core/scripts/dev/commit-code-check.sh from the top level of the checkout will check any changed YAML files.

Running yarn lint:yaml from the core directory will check all YAML files in core.

Impacts: 
Module developers