milestoneFinalityEthJsonRpcMethod.ts

// Code snippet for eth-JSON RPC method
import axios from "axios";
import { MATIC_RPC_URL } from "../utils/constants";

// Fetch finality data using eth-JSON RPC method
export async function ethJsonRpcMethod(yourBlock: number): Promise<void> {
	try {
		console.log("Waiting for your block to get finalized...\n");
		// Flag for block finality
		let finalised: boolean = false;
		// Store the last known finalized block value
		let lastFinalizedBlock: number | null = null;
		while (!finalised) {
			const response = (
				await axios.post(MATIC_RPC_URL, {
				jsonrpc: "2.0",
				id: 1,
				method: "eth_getBlockByNumber",
				params: ["finalized", true],
			})).data;
		// Convert hex to number
		lastFinalizedBlock = parseInt(response.result.number.toString(), 16);
		// Check if your block has achieved finality
		if (lastFinalizedBlock >= yourBlock) {
			finalised = true;
		}
	} catch (error) {
		console.log(`Error at ethJsonRpcMethod: ${error}`);
		process.exit(1);
	}
}