Read the Pot's holdings on each chain from one file

// Reads what the Pot holds on the chain the file is compiled for, and that chain's Uniswap V3
// USDC/WETH pool at `fee`. The file names no chain and no address: compiled with `--chain`,
// `USDC`, `WETH` and `bCSPX` (Backed's tokenized S&P 500 fund) are that chain's tokens and
// `UniswapV3.Factory` is its factory. A chain that lacks one of these names refuses to compile
// the file. The program moves nothing; it reverts only when the chain has no pool at `fee`.
//
//   sauce simulate holdings-per-chain.sauce.ts --chain <chain> --owner <address> --args <fee>
//
//   fee: Uint256  the pool's fee tier, in millionths: 500 is 0.05%, 3000 is 0.3%
//
// On Base, the 0.05% pool, and the addresses the names resolve to there:
//
//   sauce simulate holdings-per-chain.sauce.ts --chain base --owner <address> --args 500
//   sauce compile holdings-per-chain.sauce.ts --chain base --json
function main(fee: Uint256): { pool: Address; usdc: Uint256; weth: Uint256; bcspx: Uint256 } {
  // This chain's factory, asked for this chain's pair: the pool is a different contract per chain.
  const pool = UniswapV3.Factory.getPool(USDC, WETH, fee);
  require(pool != 0, "no USDC/WETH pool at that fee on this chain");
  return {
    pool: pool,
    usdc: pot.USDC,
    weth: pot.WETH,
    bcspx: pot.bCSPX,
  };
}