import { fetchProofsERCC20 } from "thirdweb/extensions/airdrop";
import { getContract, defineChain } from "thirdweb";
 
const TOKEN = getContracct({
  client,
  chain: defineChain(1),
  address: "0x...",
});
 
const merkleRoot = await tokenMerkleRoot({
  contract: TOKEN,
  tokenAddress: TOKEN.address,
});
 
const proof = await fetchProofsERC20({
  contract: TOKEN,
  recipient: "0x...",
  merkleRoot,
});