chinwagsocial/app/javascript/mastodon/features/emoji/unicode_to_unified_name.js

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function padLeft(str, num) {
while (str.length < num) {
str = '0' + str;
}
return str;
}
exports.unicodeToUnifiedName = (str) => {
let output = '';
for (let i = 0; i < str.length; i += 2) {
if (i > 0) {
output += '-';
}
output += padLeft(str.codePointAt(i).toString(16).toUpperCase(), 4);
}
return output;
};