Foundry (MegaETH Fork)

MegaETH's fork of Foundry, pinned at v1.3.0.

MegaETH Mode

Run forge test and forge coverage with MegaETH EVM semantics (gas forwarding, SALT gas metering, system contracts) via the --megaeth flag:

forge test --megaeth -vvv
forge coverage --megaeth --report lcov

Unsupported combinations (rejected with a clear error rather than silently degrading):

• --megaeth --isolate / inline isolate = true — isolation mode not implemented.
• --megaeth --fork-url <URL> — fork-aware external environment (Oracle / SALT bucket) not implemented.

Cheatcodes (vm.prank, vm.deal, vm.expectRevert, etc.) are silently skipped under --megaeth. Use pure Solidity assertions (require).

See testdata/megaeth/ for gas-divergence examples and cross-validation harness.

MegaETH ↔ mega-evm consistency

--megaeth is backed by the mega-evm library. To detect library-level drift:

• crates/forge/tests/cli/megaeth.rs holds E2E tests, including a megaeth_live_cross_validate test that installs the upstream mega-evme binary from crates.io and compares outputs byte-for-byte.
• .github/workflows/megaeth-live-validate.yml runs this cross-validation daily and on any PR touching MegaETH integration code.

Key Dependencies

Crate	Version
revm	27.0.3
op-revm	8.0.3
alloy-evm	0.15.0
alloy	1.0.23
mega-evm	1.5.1

Upstream

• Base version: foundry-rs/foundry v1.3.0
• Upstream repo: foundry-rs/foundry

License

Licensed under either of Apache License, Version 2.0 or MIT License at your option.