predict ERC20 address on L2 when deployed via OptimismMintableERC20Factory

predictL2Address.test.ts

import { base, baseSepolia } from 'viem/chains'
import { describe, expect, it } from 'vitest'

import { predictL2TokenAddress } from './predictL2Address'

describe('Predict L2 Token Addresses', () => {
  it('[BASE SEPOLIA] can predict an ERC20 token address created by the standard bridge on Base Sepolia', async () => {
    expect.hasAssertions()

    const expectedAddress = '0xDa8Df672aCfa4Ee1be95FBC1c2e0FA97d49F7BDe'

    const predictedAddress = predictL2TokenAddress(
      {
        decimals: 18,
        l1Address: '0x16cb616e782E626e12931c434d856a000b35eB64',
        name: 'IP Tokens of IPNFT #42',
        symbol: 'CYCL-01',
      },
      baseSepolia,
    )

    expect(predictedAddress).toBe(expectedAddress)
  })

  it('[BASE MAINNET] can predict an ERC20 token address created by the standard bridge', async () => {
    expect.hasAssertions()

    const expectedAddress = '0xf1208633166d9C2B3f65a012F29317EC5f47E590'

    const predictedAddress = predictL2TokenAddress(
      {
        decimals: 18,
        l1Address: '0x7b66E84Be78772a3afAF5ba8c1993a1B5D05F9C2',
        name: 'IP Tokens of IPNFT #28',
        symbol: 'VITARNA',
      },
      base,
    )

    expect(predictedAddress).toBe(expectedAddress)
  })
})

predictL2Address.ts

import {
  type Address,
  bytesToHex,
  type Chain,
  encodeAbiParameters,
  encodePacked,
  getAddress,
  type Hex,
  hexToBytes,
  keccak256,
} from 'viem'
import { base, baseSepolia } from 'viem/chains'

const CONFIGS: Record<number, any> = {
  [baseSepolia.id]: {
    bridge: '0x4200000000000000000000000000000000000010',
    tokenCreationCode:
      '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    tokenFactory: '0x4200000000000000000000000000000000000012',
  },
  [base.id]: {
    bridge: '0x4200000000000000000000000000000000000010',
    tokenCreationCode:
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    // https://docs.base.org/docs/base-contracts
    tokenFactory: '0xF10122D428B4bc8A9d050D06a2037259b4c4B83B',
  },
}

/**
 * should work fine for Optimism / base
 * @param ipt Ipt
 */
export const predictL2TokenAddress = (
  token: { decimals: number; l1Address: Address; name: string; symbol: string },
  chain: Chain,
) => {
  if (!CONFIGS[chain.id]) throw new Error('Chain not supported')

  const { bridge, tokenCreationCode, tokenFactory } = CONFIGS[chain.id]

  const saltParameters =
    chain.id === baseSepolia.id
      ? encodeAbiParameters(
          [{ type: 'address' }, { type: 'string' }, { type: 'string' }],
          [token.l1Address, token.name, token.symbol],
        )
      : encodeAbiParameters(
          //later versions added the token's decimals on the salt 🙄
          [
            { type: 'address' },
            { type: 'string' },
            { type: 'string' },
            { type: 'uint8' },
          ],
          [token.l1Address, token.name, token.symbol, token.decimals],
        )
  const salt: Hex = keccak256(saltParameters)

  const constructorParameters = encodeAbiParameters(
    [
      { type: 'address' },
      { type: 'address' },
      { type: 'string' },
      { type: 'string' },
      { type: 'uint8' },
    ],
    [bridge, ipt.id as Address, ipt.name, ipt.symbol, ipt.decimals],
  )

  const initCodeHash = keccak256(
    encodePacked(
      ['bytes', 'bytes'],
      [tokenCreationCode, constructorParameters],
    ),
  )

  const addressHash = keccak256(
    encodePacked(
      ['bytes1', 'address', 'bytes32', 'bytes32'],
      ['0xff', tokenFactory, salt, initCodeHash],
    ),
  )

  const predictedAddress = getAddress(
    bytesToHex(hexToBytes(addressHash).slice(-20)),
  )

  return predictedAddress
}