in src/behaviors/emoji/support/is_emoji_unicode_supported.js [89:92]
function checkSkinToneModifierSupport(unicodeSupportMap, emojiUnicode) {
const isSkinToneResult = isSkinToneComboEmoji(emojiUnicode);
return (unicodeSupportMap.skinToneModifier && isSkinToneResult) || !isSkinToneResult;
}