nl_tokens: Current character is known to be a backslash . Check for Unicode escape of the form \ uXXXX and return code point value if valid Unicode escape is found . Otherwise return - 1 .
pl_tokens: function peekUnicodeEscape ( ) { if ( pos + 5 < end && text . charCodeAt ( pos + 1 ) === 117 /* u */ ) { var start_1 = pos ; pos += 2 ; var <mask> = scanExactNumberOfHexDigits ( 4 ) ; pos = start_1 ; return value ; } return - 1 ; }