nl_tokens: Checks if value is an Error EvalError RangeError ReferenceError SyntaxError TypeError or URIError object .
pl_tokens: function isError ( value ) { if ( ! isObjectLike ( <mask> ) ) { return false ; } return ( objectToString . call ( value ) == errorTag ) || ( typeof value . message == 'string' && typeof value . name == 'string' ) ; }