Type-Safe Ethereum Values

// ethers/viem: Everything is bigint
const gasPrice = 20000000000n;  // Is this wei? gwei? ether?
const value = 1000000000000000000n;  // 1 ETH? or 1 wei?

// Easy to make mistakes
await wallet.sendTransaction({
  to: recipient,
  value: 1n,  // Oops! Sent 1 wei instead of 1 ETH
  gasPrice: gasPrice  // Hope the units are right...
});

import { Wei, Gwei, Ether } from '@tevm/voltaire'

const gasPrice = Gwei(20n);
const value = Ether(1n);

// Type error: GweiType is not assignable to WeiType
const wrong: WeiType = gasPrice;

// Explicit conversion required
const correct: WeiType = Gwei.toWei(gasPrice);

import { Address, Hash } from '@tevm/voltaire'

const addr = Address('0x742d35Cc6634C0532925a3b844Bc9e7595f51e3e');
const txHash = Hash('0x' + 'ab'.repeat(32));

// Type error: HashType is not assignable to AddressType
function transfer(to: AddressType) { /* ... */ }
transfer(txHash);  // Caught at compile time

import { BlockNumber, ChainId, Nonce } from '@tevm/voltaire'

const block = BlockNumber(12345678n);
const chain = ChainId(1);
const nonce = Nonce(42n);

// These won't compile
const badChain: ChainIdType = block;  // Type error
const badNonce: NonceType = chain;    // Type error

import { PrivateKey, PublicKey, Signature } from '@tevm/voltaire'

const privateKey = PrivateKey('0x...');
const publicKey = PublicKey.fromPrivateKey(privateKey);
const signature = Secp256k1.sign(messageHash, privateKey);

// Type system prevents dangerous operations
function logData(data: PublicKeyType) {
  console.log(data.toHex());  // Safe to log
}
logData(privateKey);  // Type error - PrivateKey is not PublicKey

// Business logic doesn't need validation
function calculateFee(gasPrice: GweiType, gasUsed: Uint256Type): WeiType {
  // No validation needed - types guarantee valid inputs
  const priceInWei = Gwei.toWei(gasPrice);
  return Wei(priceInWei * gasUsed);
}

// Validation happens at the boundary
function handleUserInput(input: string): WeiType {
  // Throws if invalid - validation happens once
  const gwei = Gwei(input);
  return Gwei.toWei(gwei);
}