feat: add new v2 factory addresses

BREAKING CHANGE: FACTORY_ADDRESS field removed, replaced with
FACTORY_ADDRESS_MAP

src/constants.ts

@@ -1,7 +1,26 @@
 import { Percent } from '@uniswap/sdk-core'
 import JSBI from 'jsbi'
 
-export const FACTORY_ADDRESS = '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f'
+export const FACTORY_ADDRESS_MAP: { [chainId: number]: string } = {
+  // Mainnet
+  1: '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f',
+  // Ropsten
+  3: '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f',
+  // Goerli
+  5: '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f',
+  // Optimism
+  10: '0x0c3c1c532F1e39EdF36BE9Fe0bE1410313E074Bf',
+  // Arbitrum
+  42161: '0xf1D7CC64Fb4452F05c498126312eBE29f30Fbcf9',
+  // Avalanche
+  43114: '0x9e5A52f57b3038F1B8EeE45F28b3C1967e22799C',
+  // Base
+  8453: '0x8909dc15e40173ff4699343b6eb8132c65e18ec6',
+  // BNB
+  56: '0x8909Dc15e40173Ff4699343b6eB8132c65e18eC6',
+  // Polygon
+  137: '0x9e5A52f57b3038F1B8EeE45F28b3C1967e22799C',
+};
 
 export const INIT_CODE_HASH = '0x96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f'
 

src/entities/pair.ts

@@ -6,7 +6,7 @@ import { getCreate2Address } from '@ethersproject/address'
 import { BigNumber } from '@ethersproject/bignumber'
 
 import {
-  FACTORY_ADDRESS,
+  FACTORY_ADDRESS_MAP,
   INIT_CODE_HASH,
   MINIMUM_LIQUIDITY,
   FIVE,
@@ -41,7 +41,7 @@ export class Pair {
   private readonly tokenAmounts: [CurrencyAmount<Token>, CurrencyAmount<Token>]
 
   public static getAddress(tokenA: Token, tokenB: Token): string {
-    return computePairAddress({ factoryAddress: FACTORY_ADDRESS, tokenA, tokenB })
+    return computePairAddress({ factoryAddress: FACTORY_ADDRESS_MAP[tokenA.chainId], tokenA, tokenB })
   }
 
   public constructor(currencyAmountA: CurrencyAmount<Token>, tokenAmountB: CurrencyAmount<Token>) {

src/index.ts

@@ -1,4 +1,4 @@
-export { FACTORY_ADDRESS, INIT_CODE_HASH, MINIMUM_LIQUIDITY } from './constants'
+export { FACTORY_ADDRESS_MAP, INIT_CODE_HASH, MINIMUM_LIQUIDITY } from './constants'
 
 export * from './errors'
 export * from './entities'