metamask-extension/shared/constants/network.js

export const ROPSTEN = 'ropsten';
export const RINKEBY = 'rinkeby';
export const KOVAN = 'kovan';
export const MAINNET = 'mainnet';
export const GOERLI = 'goerli';
export const NETWORK_TYPE_RPC = 'rpc';

export const MAINNET_NETWORK_ID = '1';
export const ROPSTEN_NETWORK_ID = '3';
export const RINKEBY_NETWORK_ID = '4';
export const GOERLI_NETWORK_ID = '5';
export const KOVAN_NETWORK_ID = '42';
export const LOCALHOST_NETWORK_ID = '1337';

export const MAINNET_CHAIN_ID = '0x1';
export const ROPSTEN_CHAIN_ID = '0x3';
export const RINKEBY_CHAIN_ID = '0x4';
export const GOERLI_CHAIN_ID = '0x5';
export const KOVAN_CHAIN_ID = '0x2a';
export const LOCALHOST_CHAIN_ID = '0x539';
export const BSC_CHAIN_ID = '0x38';
export const OPTIMISM_CHAIN_ID = '0xa';
export const OPTIMISM_TESTNET_CHAIN_ID = '0x45';
export const POLYGON_CHAIN_ID = '0x89';

/**
 * The largest possible chain ID we can handle.
 * Explanation: https://gist.github.com/rekmarks/a47bd5f2525936c4b8eee31a16345553
 */
export const MAX_SAFE_CHAIN_ID = 4503599627370476;

export const ROPSTEN_DISPLAY_NAME = 'Ropsten';
export const RINKEBY_DISPLAY_NAME = 'Rinkeby';
export const KOVAN_DISPLAY_NAME = 'Kovan';
export const MAINNET_DISPLAY_NAME = 'Ethereum Mainnet';
export const GOERLI_DISPLAY_NAME = 'Goerli';

const infuraProjectId = process.env.INFURA_PROJECT_ID;
const getRpcUrl = (network) =>
  `https://${network}.infura.io/v3/${infuraProjectId}`;

export const ROPSTEN_RPC_URL = getRpcUrl('ropsten');
export const RINKEBY_RPC_URL = getRpcUrl('rinkeby');
export const KOVAN_RPC_URL = getRpcUrl('kovan');
export const MAINNET_RPC_URL = getRpcUrl('mainnet');
export const GOERLI_RPC_URL = getRpcUrl('goerli');

export const ETH_SYMBOL = 'ETH';
export const WETH_SYMBOL = 'WETH';
export const TEST_ETH_SYMBOL = 'TESTETH';
export const BNB_SYMBOL = 'BNB';
export const MATIC_SYMBOL = 'MATIC';

export const ETH_TOKEN_IMAGE_URL = './images/eth_logo.svg';
export const TEST_ETH_TOKEN_IMAGE_URL = './images/black-eth-logo.svg';
export const BNB_TOKEN_IMAGE_URL = './images/bnb.png';
export const MATIC_TOKEN_IMAGE_URL = './images/matic-token.png';

export const INFURA_PROVIDER_TYPES = [ROPSTEN, RINKEBY, KOVAN, MAINNET, GOERLI];

export const TEST_CHAINS = [
  ROPSTEN_CHAIN_ID,
  RINKEBY_CHAIN_ID,
  GOERLI_CHAIN_ID,
  KOVAN_CHAIN_ID,
];

/**
 * Map of all build-in Infura networks to their network and chain IDs.
 */
export const NETWORK_TYPE_TO_ID_MAP = {
  [ROPSTEN]: { networkId: ROPSTEN_NETWORK_ID, chainId: ROPSTEN_CHAIN_ID },
  [RINKEBY]: { networkId: RINKEBY_NETWORK_ID, chainId: RINKEBY_CHAIN_ID },
  [KOVAN]: { networkId: KOVAN_NETWORK_ID, chainId: KOVAN_CHAIN_ID },
  [GOERLI]: { networkId: GOERLI_NETWORK_ID, chainId: GOERLI_CHAIN_ID },
  [MAINNET]: { networkId: MAINNET_NETWORK_ID, chainId: MAINNET_CHAIN_ID },
};

export const NETWORK_TO_NAME_MAP = {
  [ROPSTEN]: ROPSTEN_DISPLAY_NAME,
  [RINKEBY]: RINKEBY_DISPLAY_NAME,
  [KOVAN]: KOVAN_DISPLAY_NAME,
  [MAINNET]: MAINNET_DISPLAY_NAME,
  [GOERLI]: GOERLI_DISPLAY_NAME,

  [ROPSTEN_NETWORK_ID]: ROPSTEN_DISPLAY_NAME,
  [RINKEBY_NETWORK_ID]: RINKEBY_DISPLAY_NAME,
  [KOVAN_NETWORK_ID]: KOVAN_DISPLAY_NAME,
  [GOERLI_NETWORK_ID]: GOERLI_DISPLAY_NAME,
  [MAINNET_NETWORK_ID]: MAINNET_DISPLAY_NAME,

  [ROPSTEN_CHAIN_ID]: ROPSTEN_DISPLAY_NAME,
  [RINKEBY_CHAIN_ID]: RINKEBY_DISPLAY_NAME,
  [KOVAN_CHAIN_ID]: KOVAN_DISPLAY_NAME,
  [GOERLI_CHAIN_ID]: GOERLI_DISPLAY_NAME,
  [MAINNET_CHAIN_ID]: MAINNET_DISPLAY_NAME,
};

export const CHAIN_ID_TO_TYPE_MAP = Object.entries(
  NETWORK_TYPE_TO_ID_MAP,
).reduce((chainIdToTypeMap, [networkType, { chainId }]) => {
  chainIdToTypeMap[chainId] = networkType;
  return chainIdToTypeMap;
}, {});

export const CHAIN_ID_TO_RPC_URL_MAP = {
  [ROPSTEN_CHAIN_ID]: ROPSTEN_RPC_URL,
  [RINKEBY_CHAIN_ID]: RINKEBY_RPC_URL,
  [KOVAN_CHAIN_ID]: KOVAN_RPC_URL,
  [GOERLI_CHAIN_ID]: GOERLI_RPC_URL,
  [MAINNET_CHAIN_ID]: MAINNET_RPC_URL,
};

export const CHAIN_ID_TO_NETWORK_ID_MAP = Object.values(
  NETWORK_TYPE_TO_ID_MAP,
).reduce((chainIdToNetworkIdMap, { chainId, networkId }) => {
  chainIdToNetworkIdMap[chainId] = networkId;
  return chainIdToNetworkIdMap;
}, {});

export const NATIVE_CURRENCY_TOKEN_IMAGE_MAP = {
  [ETH_SYMBOL]: ETH_TOKEN_IMAGE_URL,
  [TEST_ETH_SYMBOL]: TEST_ETH_TOKEN_IMAGE_URL,
  [BNB_SYMBOL]: BNB_TOKEN_IMAGE_URL,
};

export const INFURA_BLOCKED_KEY = 'countryBlocked';

/**
 * Hardforks are points in the chain where logic is changed significantly
 * enough where there is a fork and the new fork becomes the active chain.
 * These constants are presented in chronological order starting with BERLIN
 * because when we first needed to track the hardfork we had launched support
 * for EIP-2718 (where transactions can have types and different shapes) and
 * EIP-2930 (optional access lists), which were included in BERLIN.
 *
 * BERLIN - forked at block number 12,244,000, included typed transactions and
 *  optional access lists
 * LONDON - future, upcoming fork that introduces the baseFeePerGas, an amount
 *  of the ETH transaction fees that will be burned instead of given to the
 *  miner. This change necessitated the third type of transaction envelope to
 *  specify maxFeePerGas and maxPriorityFeePerGas moving the fee bidding system
 *  to a second price auction model.
 */
export const HARDFORKS = {
  BERLIN: 'berlin',
  LONDON: 'london',
};

export const CHAIN_ID_TO_GAS_LIMIT_BUFFER_MAP = {
  [OPTIMISM_CHAIN_ID]: 1,
  [OPTIMISM_TESTNET_CHAIN_ID]: 1,
};