Using `mainnet` hard fork gives `Error: Missing required chain parameter: networkId`

[sagefarrenholz]

Issue:

Attempting to use mainnet hard fork of hardhat produces the error in title.

Reproduction:

1. Set hardhat.config.ts FORK_MAINNET to true
2. Run a script using hardhat run --network hardhat <script>
3. Call ethers.getSigners()

Error emitting line of script:

const Signer = (await ethers.getSigners())[0];

Hack solution

I was able to get rid of the error by deleting / commenting out:

 //chainId: !forkingData ? 43112 : undefined, //Only specify a chainId if we are not forking

in hardhat.config.ts

Output:

$ npx hardhat run --network hardhat scripts/<script>
Error: Missing required chain parameter: networkId
    at Common.setChain (<base_path>/node_modules/@ethereumjs/common/src/index.ts:318:17)
    at new Common (<base_path>/node_modules/@ethereumjs/common/src/index.ts:286:30)
    at Function.forCustomChain (<base_path>/node_modules/@ethereumjs/common/src/index.ts:237:12)
    at Object.makeForkCommon (<base_path>/node_modules/hardhat/src/internal/hardhat-network/provider/utils/makeForkCommon.ts:6:17)
    at Function.create (<base_path>/node_modules/hardhat/src/internal/hardhat-network/provider/node.ts:157:22)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at HardhatNetworkProvider._init (<base_path>/node_modules/hardhat/src/internal/hardhat-network/provider/provider.ts:232:28)
    at HardhatNetworkProvider._send (<base_path>/node_modules/hardhat/src/internal/hardhat-network/provider/provider.ts:180:5)
    at HardhatNetworkProvider.request (<base_path>/node_modules/hardhat/src/internal/hardhat-network/provider/provider.ts:106:18)
    at EthersProviderWrapper.send (<base_path>/node_modules/@nomiclabs/hardhat-ethers/src/internal/ethers-provider-wrapper.ts:13:20)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[to-sh-1]

I replaced mine to look like this and it's working chainId: !forkingData ? 43112 : 43114