Adding an ERC20 token to Metamask with wallet_watchAsset

wallet_watchAsset.js

const params = addToken({
  type: 'ERC20',
  options: {
    address: '0x2acc95758f8b5f583470ba265eb685a8f45fc9d5',
    symbol: 'RIF',
    decimals: 18,
    image: 'https://s2.coinmarketcap.com/static/img/coins/64x64/3701.png'
  }
})

window.ethereum.request({ method: 'wallet_watchAsset', params })
  .then(() => setLog([...log, 'Success, Token added!']))
  .catch((error: Error) => setLog([...log, `Error: ${error.message}`]))

I think good article.