joshuakgoldberg/eslint-plugin-yml

YAML files show up everywhere in modern software, configuration files, CI/CD pipelines, translation catalogs, but they can be surprisingly easy to break. A misplaced space, a tab instead of spaces, or an empty value can silently cause problems. eslint-plugin-yml brings the same kind of automated quality checking that JavaScript developers rely on directly to YAML files, catching mistakes and enforcing consistent formatting before they cause issues. ESLint is a popular tool that checks code for errors and style problems. Normally it works on JavaScript, but this plugin extends it to understand YAML. Under the hood, it parses YAML into a structured representation that ESLint can inspect, then applies rules like "disallow tabs for indentation," "enforce consistent quote usage," or "disallow empty keys." Many of these rules can even auto-fix problems for you. It also supports special comment directives within YAML files, so you can selectively turn off rules on specific lines when needed. This is useful for any team that maintains a significant number of YAML files. If you have a project with GitHub Actions workflows, Docker Compose files, or application configuration written in YAML, this plugin helps keep everything consistent and error-free. It also supports Vue single-file components that embed YAML in custom blocks, which is handy for projects managing translations. Teams already using ESLint for their JavaScript can add YAML linting to the same workflow rather than introducing a separate tool. One notable design choice is how the plugin integrates with ESLint. Some YAML linting approaches run as external processors that just report errors independently. This plugin instead feeds the full structure and source text into ESLint's engine, which means standard ESLint features like inline disable comments and compatibility with formatting tools like Prettier work as expected. It also provides preset rule bundles ranging from basic error prevention to stricter style enforcement, so teams can pick the level of rigor that fits their project.