This is an extension for the Brackets editor that provides linting functionality for YAML files.
To install, simply look for this extension in the Brackets extension manager.
This extension uses a modified, bundled version of js-yaml to parse the YAML file. The modification makes js-yaml emit a warning when a key is re-defined in a mapping, e.g.
days_of_the_week: Monday: 1 Tuesday: 2 Wednesday: 3 Thursday: 4 Friday: 5 Saturday: 6 Sunday: 7 Monday: 1
will cause a warning to be emitted because
Monday has been defined twice. This was added because it is a common mistake that can be frustrating to trouble-shoot.