Add initial chains configuration

lib/config/chains.ts

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+import { TNetworks } from "../../types/chains";
+
+export const SUPPORTED_CHAINS: TNetworks = {
+  testnet: {
+    polygon: {
+      name: "polygon",
+      network: "polygon",
+      blockExplorer: "https://mumbai.polygonscan.com/",
+      nodeRPC: "https://matic-mumbai.chainstacklabs.com",
+      chainId: 80001,
+      mintContractAddress: "0xD96250D736642a487366170acd7823d8038Df212",
+      currency: "MATIC",
+    },
+  },
+  mainnet: {
+    polygon: {
+      name: "polygon",
+      network: "polygon",
+      blockExplorer: "https://polygonscan.com/",
+      nodeRPC: "https://polygon-rpc.com/",
+      chainId: 137,
+      mintContractAddress: "0xCd494673999194365033D7A287af9f0a3b163874",
+      currency: "MATIC",
+    },
+  },
+};
+
+export const CHAINS_ENV =
+  process.env.NODE_ENV === "production"
+    ? SUPPORTED_CHAINS.mainnet
+    : SUPPORTED_CHAINS.testnet;

lib/web3/index.ts

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+import { ethers } from "ethers";
+import { TChain } from "../../types/chains";
+import { CHAINS_ENV } from "../config/chains";
+import NFTABI from "../web3/abis/NFT.json";
+class Web3Instance {
+  public provider;
+
+  constructor() {
+    this.provider = new ethers.providers.JsonRpcProvider(
+      CHAINS_ENV.polygon.nodeRPC
+    );
+  }
+
+  public contract(chain: TChain = "polygon") {
+    const network = this.getChainByName(chain);
+    return new ethers.Contract(
+      network.mintContractAddress,
+      NFTABI,
+      this.provider
+    );
+  }
+
+  public getChainByName(chain: TChain = "polygon") {
+    return CHAINS_ENV[chain];
+  }
+}
+
+export default Web3Instance;

types/chains.ts

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+export type TChain = "polygon";
+
+export interface IChainInfo {
+  name: TChain;
+  network: string;
+  nodeRPC: string;
+  blockExplorer: string;
+  chainId: number;
+  mintContractAddress: string;
+  currency: string;
+}
+
+export type TSupportedChains = Record<TChain, IChainInfo>;
+
+export type TNetworks = Record<"testnet" | "mainnet", TSupportedChains>;