JS_IDENT_PART top-level property
Implementation
final JS_IDENT_PART = (r'(?:[$' +
uni.combine([
'Lu',
'Ll',
'Lt',
'Lm',
'Lo',
'Nl',
'Mn',
'Mc',
'Nd',
'Pc'
]) + /*u*/ '\u200c\u200d]|\\\\u[a-fA-F0-9]{4})');