@metro-xyz/ethereumjs-vm

This is a fork of the ethereumjs monorepo and the Nomic Foundation ethereumjs-vm repo. It's used to publish our own versions under the @metro-xyz npm org.

This custom version of the Hardhat EVM allows us to override values required for a transaction's gas calculation (e.g. gas used, gas limit, gas price). Metro needs this functionality to ensure that the gas values for each transaction, and the ETH balances of all accounts, remain in sync between Metro's shadow forks and mainnet.