in archived/SharedContent/js/Microsoft.WinJS/js/base.js [8468:8490]
case isWhitespace(code) && code:
case isLineTerminator(code) && code:
return hasEscape ? -offset : offset;
case (code > 0x7f) && code:
break;
//case isDecimalDigit(code) && code:
case (code >= /*0*/48 && code <= /*9*/57) && code:
break;
case /*\*/92:
if (offset + 5 < limit) {
if (text.charCodeAt(offset + 1) === /*u*/117 &&
isHexDigit(text.charCodeAt(offset + 2)) &&
isHexDigit(text.charCodeAt(offset + 3)) &&
isHexDigit(text.charCodeAt(offset + 4)) &&
isHexDigit(text.charCodeAt(offset + 5))) {
offset += 5;
hasEscape = true;
break;
}
}