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/* eslint-disable babel/new-cap, xo/throw-new-error */
'use strict';
module.exports = function (str, pos) {
if (str === null || str === undefined) {
throw TypeError();
}
str = String(str);
var size = str.length;
var i = pos ? Number(pos) : 0;
if (Number.isNaN(i)) {
i = 0;
}
if (i < 0 || i >= size) {
return undefined;
}
var first = str.charCodeAt(i);
if (first >= 0xD800 && first <= 0xDBFF && size > i + 1) {
var second = str.charCodeAt(i + 1);
if (second >= 0xDC00 && second <= 0xDFFF) {
return ((first - 0xD800) * 0x400) + second - 0xDC00 + 0x10000;
}
}
return first;
};
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