JSON Schema & Autocompletion
A JSONSchema is provided at https://beaujs.com/schema.json. It can be referenced to provide validation and autocompletion on editors with JSONSchema support for yaml files.
The schema is also available on schemastore.org so if your editor automatically sync with it, it should work for beau.yml files from the get got.
In editors using the yaml-language-server you can manually reference the schema with a comment for files not named beau.yml:
# yaml-language-server: $schema=https://beaujs.com/schema.json
The schema has been tested successfully in NeoVim and VS Code.