ChainId

import * as ChainId from '@voltaire/primitives/ChainId'

const mainnet = ChainId.from(1)
const sepolia = ChainId.from(11155111)

if (ChainId.isMainnet(1)) {
  console.log('Using Ethereum mainnet')
}

type ChainIdType = number & { readonly [brand]: "ChainId" }

const mainnet = ChainId.from(1)
const arbitrum = ChainId.from(42161)
const base = ChainId.from(8453)

ChainId.from(-1)    // Error: must be non-negative
ChainId.from(1.5)   // Error: must be integer

import { MAINNET, SEPOLIA, HOLESKY, OPTIMISM, ARBITRUM, BASE, POLYGON } from '@voltaire/primitives/ChainId'

// Ethereum
const mainnet = MAINNET      // 1
const sepolia = SEPOLIA      // 11155111
const holesky = HOLESKY      // 17000

// Layer 2s
const optimism = OPTIMISM    // 10
const arbitrum = ARBITRUM    // 42161
const base = BASE            // 8453
const polygon = POLYGON      // 137

const n = ChainId.toNumber(42161) // 42161

const same = ChainId.equals(1, 1)           // true
const different = ChainId.equals(1, 10)     // false

ChainId.isMainnet(1)     // true
ChainId.isMainnet(10)    // false (Optimism)
ChainId.isMainnet(42161) // false (Arbitrum)

import * as ChainId from '@voltaire/primitives/ChainId'

const tx = {
  chainId: ChainId.from(1),  // Mainnet only
  to: "0x...",
  value: 1000000000000000000n,
  // ... other fields
}

// This transaction can only be valid on Ethereum mainnet
// Submitting to Arbitrum would fail signature verification

import { ChainId } from '@voltaire/primitives/ChainId'

// Using namespace object
const id = ChainId.from(1)
const isMain = ChainId.isMainnet(1)
const equal = ChainId.equals(1, 1)