hardhat/dist/src/internal/builtin-plugins/network-manager/request-handlers/handlers/gas/fixed-gas-price-handler.js

Hardhat is an extensible developer tool that helps smart contract developers increase productivity by reliably bringing together the tools they want.

import { isObject } from "@nomicfoundation/hardhat-utils/lang";
import { getRequestParams } from "../../../json-rpc.js";
/**
 * This class ensures that a fixed gas price is applied to transaction requests.
 * For `eth_sendTransaction` requests, it sets the gasPrice field with the value provided via the class constructor, if it hasn't been specified already.
 */
export class FixedGasPriceHandler {
    #gasPrice;
    constructor(gasPrice) {
        this.#gasPrice = gasPrice;
    }
    async handle(jsonRpcRequest) {
        if (jsonRpcRequest.method !== "eth_sendTransaction") {
            return jsonRpcRequest;
        }
        const params = getRequestParams(jsonRpcRequest);
        const [tx] = params;
        // Temporary change to ignore EIP-1559
        if (isObject(tx) &&
            tx.gasPrice === undefined &&
            tx.maxFeePerGas === undefined &&
            tx.maxPriorityFeePerGas === undefined) {
            tx.gasPrice = this.#gasPrice;
        }
        return jsonRpcRequest;
    }
}
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