Function config_invalid_event 

pub fn config_invalid_event(error: &ConfigError) -> String

What: Render the config-invalid event for a rejected configuration. String is the owned, line-terminated JSON line. Why: Configuration failures are machine-readable events with exit status 2, on standard error for wrapped commands and standard output for direct commands.

In TS you’d write (pseudocode):

function configInvalidEvent(error: ConfigError): string;