mastodon/app/javascript/themes/glitch/util/emoji/unicode_to_filename.js

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// taken from:
// https://github.com/twitter/twemoji/blob/47732c7/twemoji-generator.js#L848-L866
exports.unicodeToFilename = (str) => {
let result = '';
let charCode = 0;
let p = 0;
let i = 0;
while (i < str.length) {
charCode = str.charCodeAt(i++);
if (p) {
if (result.length > 0) {
result += '-';
}
result += (0x10000 + ((p - 0xD800) << 10) + (charCode - 0xDC00)).toString(16);
p = 0;
} else if (0xD800 <= charCode && charCode <= 0xDBFF) {
p = charCode;
} else {
if (result.length > 0) {
result += '-';
}
result += charCode.toString(16);
}
}
return result;
};