in scripts/build.js [529:540]
function fromCodePoint(codepoint) {
var code = typeof codepoint === 'string' ?
parseInt(codepoint, 16) : codepoint;
if (code < 0x10000) {
return fromCharCode(code);
}
code -= 0x10000;
return fromCharCode(
0xD800 + (code >> 10),
0xDC00 + (code & 0x3FF)
);
}