tweb-i2p/src/environment/emojiVersionsSupport.ts

import IS_EMOJI_SUPPORTED from './emojiSupport';

export type EMOJI_VERSION = '' | '14';

const EMOJI_VERSIONS_SUPPORTED: {
  [v in EMOJI_VERSION]: boolean
} = {} as any;

// Thanks to WebZ for the detect
function isEmojiSupported(emoji: string) {
  const ALLOWABLE_CALCULATION_ERROR_SIZE = 5;
  const inlineEl = document.createElement('span');
  inlineEl.classList.add('emoji');
  document.body.appendChild(inlineEl);

  inlineEl.innerText = emoji; // Emoji from 14.0 version
  const newEmojiWidth = inlineEl.offsetWidth;
  inlineEl.innerText = '❤️'; // Emoji from 1.0 version
  const legacyEmojiWidth = inlineEl.offsetWidth;

  document.body.removeChild(inlineEl);

  return Math.abs(newEmojiWidth - legacyEmojiWidth) < ALLOWABLE_CALCULATION_ERROR_SIZE;
}

if(IS_EMOJI_SUPPORTED) {
  EMOJI_VERSIONS_SUPPORTED[''] = true;

  const a: [keyof typeof EMOJI_VERSIONS_SUPPORTED, string][] = [
    ['14', '🫱🏻']
  ];

  a.forEach(([version, emoji]) => {
    EMOJI_VERSIONS_SUPPORTED[version] = isEmojiSupported(emoji);
  });
}

export default EMOJI_VERSIONS_SUPPORTED;