Converting an existing React.js dapp to a Comet Extension using the shim.

index.js

import { useMemo, useEffect } from 'react';
import { RPCWeb3Provider, buildRPC } from '@compound-finance/comet-extension';

export function useRPC() {
  let rpc = useMemo(buildRPC, []);

  useEffect(() => {
    rpc.attachHandler()
    return rpc.detachHandler;
  }, [rpc]);

  return rpc;
}

if (isEmbeddedAsCometExtension) {
  provider = new RPCWeb3Provider(useRPC().sendRPC);
} else {
  // Create the provider for Web3.js like you normally would
}

web3 = new Web3(provider);