transaction_middleware.ts

/*
This file is part of web3.js.

web3.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

web3.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
*/

import { TransactionMiddleware, TransactionMiddlewareData } from "web3-eth";

// Sample Transaction Middleware 
export class Web3TransactionMiddleware implements TransactionMiddleware {

	// eslint-disable-next-line class-methods-use-this
	public async processTransaction(transaction: TransactionMiddlewareData, 
		_options?: { [key: string]: unknown } | undefined): 
		
		Promise<TransactionMiddlewareData> {
		
		// eslint-disable-next-line prefer-const
		let txObj = { ...transaction };

		// Add your logic here for transaction modification 
		txObj.data = '0x123';

		return Promise.resolve(txObj);
	}

}