rn-emoji-keyboard/scripts/generateIcons.js

const json = require('unicode-emoji-json/data-by-group.json');
const fs = require('fs');

const newArray = [];
for (const [key, value] of Object.entries(json)) {
  const newData = value.map((emoji) => ({
    emoji: emoji.emoji,
    name: emoji.name,
    slug: emoji.slug,
  }));
  newArray.push({
    title: key.replace(' & ', '_').replace(' ', '_').toLocaleLowerCase(),
    data: newData,
  });
}

fs.writeFile(
  './src/assets/emojis.json',
  JSON.stringify(newArray),
  function (err) {
    if (err) return console.log(err);
    console.log('emojis.json successfully saved to assets folder');
  }
);