Increase block gas limit hardhat

Question

I'm just running some tests with massive functions, and I keep running into

InvalidInputError: Transaction gas limit is 30429720 and exceeds block gas limit of 30000000

How do I increase the block gas limit in hardhat?

Answer 1

If your hardhat.config.js increase the blockGasLimit

module.exports = {
    defaultNetwork: "hardhat",
    networks: {
        hardhat: {
            blockGasLimit: 100000000429720 // whatever you want here
        },
    }
}

Answer 2

There is an option like allowUnlimitedContractSize: true,, you might find its usage below. In one place I found Error: cannot estimate gas; transaction may fail or may require manual gas limit might appear by different reasons and cannot estimate gas might throttle the main error -- can not prove it in my experience, when I had increased gas limit the issue was disappeared, but it is important to keep it in mind.

import { HardhatUserConfig } from "hardhat/config";
import "@nomicfoundation/hardhat-toolbox";

const config: HardhatUserConfig = {
  solidity: "0.8.9",
  networks: {
    hardhat: {
      allowUnlimitedContractSize: true,
    }
  }
  
};

export default config;