export const toSnakeCase = ( str ? ) : string | undefined => { if ( ! str ) return undefined ; return ( str . match ( /[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g ) || [ ] ) . map ( ( x ) => x . toLowerCase ( ) ) . join ( '_' ) ; } ;