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Foundry v1.4.0

This release brings up to 10.52% better performance for forge coverage and up to 11.41% for fuzzed tests, a new formatter built on Solar, enhanced handling of multiple chain configurations and deployments, and an improved testing and debugging experience with backtraces and custom network precompiles. Foundry v1.4 is Osaka-ready, comes with new Anvil endpoints, deprecates the Etherscan v1 API, and publishes forge as an npm package.

Performance Improvements

Foundry v1.4 leverages Solar API to analyze contracts and identify coverage items (#11565), and updates coverage implementation to align with that of forge test (#11801). It also completely removes the proptest runner from fuzzed tests (#11061), resulting in up to a 10.52% performance improvement for forge coverage and up to an 11.41% performance improvement in fuzzed tests execution speed on the same benchmarked projects as previous versions.

Forge Coverage

Repository v1.3.6 v1.4.0 X Times Faster % Improvement
ithacaxyz-account 14.91 s 13.34 s x1.12 10.52%
Uniswap-v4-core 1m 34.8s 1m 30.3s x1.05 4.74%
sparkdotfi-spark-psm 3m 49.3s 3m 40.2s x1.04 3.97%

Forge Fuzz tests

Repository v1.3.6 v1.4.0 X Times Faster % Improvement
ithacaxyz-account 3.18 s 3.02 s x1.05 5.03%
solady 2.39 s 2.24 s x1.07 6.28%
Uniswap-v4-core 6.84 s 6.20 s x1.10 9.36%
sparkdotfi-spark-psm 3.07 s 2.72 s x1.13 11.41%

Enhanced configuration

Configuration inheritance

Foundry v1.4 supports configuration inheritance through the extends field in foundry.toml, making it easier to maintain a shared base configuration across multiple projects or profiles (#11284). This enables cleaner setups and reduces duplication by inheriting from a base configuration file: 

[profile.default]
extends = "./base-config.toml"
src = "src"
test = "test"

For more details please refer to configuration inheritance docs.

Multi-chain configuration

The newly added forge-std config helper, built on top of Foundry v1.4 cheatcodes, provides a streamlined way to manage configuration for multi-chain environments in tests and scripts. It automatically loads and parses TOML configuration files, creates forks for specified chains, and provides type-safe access to configuration variables.
Loading configuration and creating forks for each chain specified in the config can be done by calling _loadConfigAndForks function, which also supports updating configurations on the fly. 

function _loadConfigAndForks(string memory filePath, bool writeToFile) internal

Scripting workflows, in particular, gain significant advantages from the features of the Config contract. Please refer to config helper docs and scripting with config docs for more details.
For a complex, production-ready example, please see Ithaca's account deploy script and configuration.

We're continuously working to improve multi-chain support, please share your feedback on the current approach and suggest new features or enhancements in #11449.

Enhanced testing UX

Foundry v1.4 introduces backtraces (#11547) that include the exact line number in the Solidity source code corresponding to the compiled bytecode where the error or revert occurred. 

[FAIL: ERC20: transfer amount exceeds allowance] testTransferFromWithoutApproval() (gas: 28771)
Traces:
  [28771] ForkBacktraceTest::testTransferFromWithoutApproval()
    ├─ [22928] ForkedERC20Wrapper::transferFromWithoutApproval(0x55FE002aefF02F77364de339a1292923A15844B8, 0x000000000000000000000000000000000000dEaD, 1000000 [1e6])
    │   ├─ [18884] FiatTokenProxy::fallback(0x55FE002aefF02F77364de339a1292923A15844B8, 0x000000000000000000000000000000000000dEaD, 1000000 [1e6])
    │   │   ├─ [11573] FiatTokenV2_2::transferFrom(0x55FE002aefF02F77364de339a1292923A15844B8, 0x000000000000000000000000000000000000dEaD, 1000000 [1e6]) [delegatecall]
    │   │   │   └─ ← [Revert] ERC20: transfer amount exceeds allowance
    │   │   └─ ← [Revert] ERC20: transfer amount exceeds allowance
    │   └─ ← [Revert] ERC20: transfer amount exceeds allowance
    └─ ← [Revert] ERC20: transfer amount exceeds allowance

Backtrace:
  at FiatTokenV2_2.transferFrom
  at FiatTokenProxy.fallback
  at ForkedERC20Wrapper.transferFromWithoutApproval (src/ForkedERC20Wrapper.sol:35:24)
  at ForkBacktraceTest.testTransferFromWithoutApproval (test/ForkBacktrace.t.sol:28:96)

Forge Formatter

Foundry v1.4 ships with a new Solidity formatter (forge fmt) built on top of Solar and replacing the previous Solang-based implementation and its limitations (#10907). This change enables faster support for new Solidity language features and allows us to address long-standing formatting bugs that were previously blocked by Solang dependency.

We've aimed for feature parity with the legacy formatter, but there may still be some edge cases that aren’t fully covered yet, so please be aware and report any issues you encounter.

Coverage-Guided Fuzzing

In addition to extending coverage-guided fuzzing and time-based campaigns to stateless fuzz tests, this version introduces ABI mutations (such as bit-flip, interesting word, increment/decrement, and Gaussian noise mutators) to enhance test coverage and help uncover new execution paths by generating diverse and edge-case inputs (#11061).

Custom Network Precompiles

Beginning with the transfer precompile contributed by the Celo team for Anvil (#11209), we have extended support to forge and cast components, making it simpler for external contributions. If you want to contribute support for a custom network, please check out documentation and Celo example within foundry-evm-networks crate.

Anvil Improvements

With this release, Anvil adds support for JS and prestate tracers, and print traces and logs when using --print-traces switch, enabling more powerful and customizable debugging capabilities. Additionally, several new RPC endpoints have been introduced:

  • eth_config: exposes Anvil's current configuration, such as chain ID, fork settings, and feature flags (#11591).
  • anvil_impersonateSignature: allows simulating transactions as if they were signed by a given address, useful for testing signature-based flows (#11195).
  • anvil_getBlobSidecarsByBlockId: returns the blobs for a given transaction hash (#11828).

Other

  • forge lint improvements: mixed case exceptions lint, ERC20 transfer check
  • improve state diffs cheatcodes by adding nonce and balance diffs and by using storage layout to decode values
  • addition of native vm.bound cheatcode that enables log-uniform sampling
  • updated Sourcify integration to support API v2

Performance improvements

Anvil Features

Anvil Fixes

Cast Features

  • feat(cast): transaction to transaction request (#11151) by @Rimeeeeee
  • feat(cast): new pad cmd for hex data (#11152) by @0xrusowsky
  • feat(cast): add --file option for decode-calldata (#11201) by @minhd-vu
  • feat(cast) more descriptive errors for gcp & aws signers (#11248) by @siosw
  • feat(cast): wallet new - enable default keystore (#9201) by @kien6034
  • feat(cast): add abi-encode-event command (#11300) by @shiyasmohd
  • feat(cast): support base + offset for storage slot calc (#11566) by @0xferrous
  • feat(cast): add --data --from-file --no-hash options for wallet verify for feature parity with wallet sign (#11646) by @Detoo
  • feat(cast): handle invalid JSON in recover-authority without panic (#11690) by @VolodymyrBg
  • feat(cast): apply network precompiles for cast run and call (#11720) by @grandizzy
  • feat: cast storage --solc-version CLI argument (#11321) by @zugdev
  • Add cast command to convert beacon payload to execution payload b2e-payload (#11629) by @lean-apple
  • feat: add trace transaction opts (#11781) by @kien603

Cast Fixes

Forge Features

Forge Fixes

Other

Full Changelog:

v1.3.6...v1.4.0-rc1

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