nl_tokens: Prepend a message to an Error message .
pl_tokens: function ( error , message , quoteInput ) { var result , prepend , empty = "" , quote = "'" ; if ( error ) { if ( message ) { prepend = quoteInput ? empty . concat ( quote , message , quote ) : message ; } // Force Error instance, coerce given error to a string error = error instanceof Error ? error : new Error ( empty + <mask> ) ; // If message supplied, prepend it error . message = prepend ? empty . concat ( prepend , ": " , error . message ) : error . message ; result = error ; } return result ; }