UnknownFormatterError

The Cause

You specified a formatter that doesn’t exist. Formatters control how Thymian reports are displayed.

Available formatters:

• cli - Command-line output (default)
• markdown - Markdown format
• csv - Comma-separated values (CSV)

The Solution

Check your configuration file for typos in the formatter name:

thymian-conf.yml

reporter:
  formatters:
    cli: {} # ✅ Valid
    my-custom: {} # ❌ Unknown formatter

If you want to add a custom formatter, you need to create a plugin that listens to the core.report event:

export default function myFormatterPlugin(emitter) {
  emitter.on('core.report', ({ report }) => {
    // Custom formatting logic
  });
}

For more information on creating custom formatters, see the plugin documentation.