How to use the esutils/lib/code.isIdentifierStartES6 function in esutils
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stealjs / steal / ext / babel-code-frame.js View on Github 
function isIdentifierNameES6(id) {
var i, iz, ch, lowCh, check;
if (id.length === 0) {
return false;
}
check = code.isIdentifierStartES6;
for (i = 0, iz = id.length; i < iz; ++i) {
ch = id.charCodeAt(i);
if (55296 <= ch && ch <= 56319) {
++i;
if (i >= iz) {
return false;
}
lowCh = id.charCodeAt(i);
if (!(56320 <= lowCh && lowCh <= 57343)) {
return false;
}
ch = decodeUtf16(ch, lowCh);
}
if (!check(ch)) {
return false;
}esutils
utility box for ECMAScript language tools
