v5.4.0

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Breaking changes

• Update minimum pragma to 0.8.24 in SignatureChecker, Governor and Governor's extensions. (#​5716).

Pragma changes

• Reduced pragma requirement of interface files

Changes by category

Account

• Account: Added a simple ERC-4337 account implementation with minimal logic to process user operations. (#​5657)
• AccountERC7579: Extension of Account that implements support for ERC-7579 modules of type executor, validator, and fallback handler. (#​5657)
• AccountERC7579Hooked: Extension of AccountERC7579 that implements support for ERC-7579 hook modules. (#​5657)
• EIP7702Utils: Add a library for checking if an address has an EIP-7702 delegation in place. (#​5587)
• IERC7821, ERC7821: Interface and logic for minimal batch execution. No support for additional opData is included. (#​5657)

Governance

• GovernorNoncesKeyed: Extension of Governor that adds support for keyed nonces when voting by sig. (#​5574)

Tokens

• ERC20Bridgeable: Implementation of ERC-7802 that makes an ERC-20 compatible with crosschain bridges. (#​5739)

Cryptography

Signers

• AbstractSigner, SignerECDSA, SignerP256, and SignerRSA: Add an abstract contract and various implementations for contracts that deal with signature verification. (#​5657)
• SignerERC7702: Implementation of AbstractSigner for Externally Owned Accounts (EOAs). Useful with ERC-7702. (#​5657)
• SignerERC7913: Abstract signer that verifies signatures using the ERC-7913 workflow. (#​5659)
• MultiSignerERC7913: Implementation of AbstractSigner that supports multiple ERC-7913 signers with a threshold-based signature verification system. (#​5659)
• MultiSignerERC7913Weighted: Extension of MultiSignerERC7913 that supports assigning different weights to each signer, enabling more flexible governance schemes. (#​5741)

Verifiers

• ERC7913P256Verifier and ERC7913RSAVerifier: Ready to use ERC-7913 verifiers that implement key verification for P256 (secp256r1) and RSA keys. (#​5659)

Other

• SignatureChecker: Add support for ERC-7913 signatures alongside existing ECDSA and ERC-1271 signature verification. (#​5659)
• ERC7739: An abstract contract to validate signatures following the rehashing scheme from ERC7739Utils. (#​5664)
• ERC7739Utils: Add a library that implements a defensive rehashing mechanism to prevent replayability of smart contract signatures based on the ERC-7739. (#​5664)

Structures

• EnumerableMap: Add support for BytesToBytesMap type. (#​5658)
• EnumerableMap: Add keys(uint256,uint256) that returns a subset (slice) of the keys in the map. (#​5713)
• EnumerableSet: Add support for StringSet and BytesSet types. (#​5658)
• EnumerableSet: Add values(uint256,uint256) that returns a subset (slice) of the values in the set. (#​5713)

Utils

• Arrays: Add unsafeAccess, unsafeMemoryAccess and unsafeSetLength for bytes[] and string[]. (#​5568)
• Blockhash: Add a library that provides access to historical block hashes using EIP-2935's history storage, extending the standard 256-block limit to 8191 blocks. (#​5642)
• Bytes: Fix lastIndexOf(bytes,byte,uint256) with empty buffers and finite position to correctly return type(uint256).max instead of accessing uninitialized memory sections. (#​5797)

v5.3.0

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Breaking Changes

• Replace GovernorCountingOverridable.VoteReceipt struct parameter member names hasOverriden and overridenWeight for hasOverridden and overriddenWeight respectively.

Custom error changes

• Replace GovernorAlreadyOverridenVote with GovernorAlreadyOverriddenVote.
• Replace GovernorOnlyProposer with GovernorUnableToCancel.

Changes by category

Account

• ERC4337Utils: Update the hash function to call getUserOpHash on the specified entrypoint and add an ENTRYPOINT_V08 constant. (#​5614)
• ERC7579Utils: Add ABI decoding checks on calldata bounds within decodeBatch. (#​5371)
• ERC7579Utils: Replace address(0) with address(this) during execution for calldata compression efficiency. (#​5614)

Governance

• IGovernor: Add the getProposalId function to the governor interface. (#​5290)
• GovernorProposalGuardian: Add a governance extension that defines a proposal guardian who can cancel proposals at any stage in their lifecycle. (#​5303)
• GovernorSequentialProposalId: Adds a Governor extension that sequentially numbers proposal ids instead of using the hash. (#​5290)
• GovernorSuperQuorum: Add a governance extension to support a super quorum. Proposals that meet the super quorum (and have a majority of for votes) advance to the Succeeded state before the proposal deadline. (#​5526)
• GovernorVotesSuperQuorumFraction: Add a variant of the GovernorSuperQuorum extensions where the super quorum is expressed as a fraction of the total supply. (#​5526)
• TimelockController: Receive function is now virtual. (#​5509)

Structures

• EnumerableSet: Add clear function to EnumerableSets which deletes all values in the set. (#​5486)
• EnumerableMap: Add clear function to EnumerableMaps which deletes all entries in the map. (#​5486)
• MerkleTree: Add an update function that replaces a previously inserted leaf with a new value, updating the tree root along the way. (#​5526)

Tokens

• ERC4626: Use the asset getter in totalAssets, _deposit and _withdraw. (#​5322)
• IERC6909: Add the interface for ERC-6909. (#​5343)
• ERC6909: Add a standard implementation of ERC6909. (#​5394)
• ERC6909TokenSupply: Add an extension of ERC6909 which tracks total supply for each token id. (#​5394)
• ERC6909Metadata: Add an extension of ERC6909 which adds metadata functionality. (#​5394)
• ERC6909ContentURI: Add an extension of ERC6909 which adds content URI functionality. (#​5394)
• SafeERC20: Add trySafeTransfer and trySafeTransferFrom that do not revert and return false if the transfer is not successful. (#​5483)

Other

• Address: bubble up revert data on sendValue failed call. (#​5379)
• Calldata: Library with emptyBytes and emptyString functions to generate empty bytes and string calldata types. (#​5422)
• ERC2771Forwarder: Expose the _isTrustedByTarget internal function to check whether a target trusts the forwarder. (#​5416)
• Hashes: Expose efficientKeccak256 for hashing non-commutative pairs of bytes32 without allocating extra memory. (#​5442)
• Initializable: Add _initializableStorageSlot function that returns a pointer to the storage struct. The function allows customizing with a custom storage slot with an override. (#​5526)
• Math: Add add512, mul512 and mulShr. (#​5526)
• Math: Add saturating arithmetic operations saturatingAdd, saturatingSub and saturatingMul. (#​5526)
• MessageHashUtils: Add toDataWithIntendedValidatorHash(address, bytes32). (#​5526)
• P256: Adjust precompile detection in verifyNative to consider empty returndata on invalid verification. Previously, invalid signatures would've reverted with a MissingPrecompile error in chains with RIP-7212 support. (#​5620)
• Pausable: Stop explicitly setting paused to false during construction. (#​5448)
• Strings: Add espaceJSON that escapes special characters in JSON strings. (#​5526)

v5.2.0

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Breaking Changes

Custom error changes

This version comes with changes to the custom error identifiers. Contracts previously depending on the following errors should be replaced accordingly:

• Replace Errors.FailedCall with a bubbled-up revert reason in Address.sendValue.

Changes by category

General

• Update some pragma directives to ensure that all file requirements match that of the files they import. (#​5273)

Account

• ERC4337Utils: Add a reusable library to manipulate user operations and interact with ERC-4337 contracts (#​5274)
• ERC7579Utils: Add a reusable library to interact with ERC-7579 modular accounts (#​5274)

Governance

• GovernorCountingOverridable: Add a governor counting module that enables token holders to override the vote of their delegate. (#​5192)
• VotesExtended: Create an extension of Votes which checkpoints balances and delegates. (#​5192)

Proxy

• Clones: Add cloneWithImmutableArgs and cloneDeterministicWithImmutableArgs variants that create clones with per-instance immutable arguments. The immutable arguments can be retrieved using fetchCloneArgs. The corresponding predictDeterministicWithImmutableArgs function is also included. (#​5109)

Tokens

• ERC1363Utils: Add helper similar to the existing ERC721Utils and ERC1155Utils (#​5133)

Utils

• Address: bubble up revert data on sendValue failed call (#​5418)
• Bytes: Add a library of common operations that operate on bytes objects. (#​5252)
• CAIP2 and CAIP10: Add libraries for formatting and parsing CAIP-2 and CAIP-10 identifiers. (#​5252)
• NoncesKeyed: Add a variant of Nonces that implements the ERC-4337 entrypoint nonce system. (#​5272)
• Packing: Add variants for packing bytes10 and bytes22 (#​5274)
• Strings: Add parseUint, parseInt, parseHexUint and parseAddress to parse strings into numbers and addresses. Also provide variants of these functions that parse substrings, and tryXxx variants that do not revert on invalid input. (#​5166)

v5.1.0

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Breaking changes

• ERC1967Utils: Removed duplicate declaration of the Upgraded, AdminChanged and BeaconUpgraded events. These events are still available through the IERC1967 interface located under the contracts/interfaces/ directory. Minimum pragma version is now 0.8.21.
• Governor, GovernorCountingSimple: The _countVote virtual function now returns an uint256 with the total votes cast. This change allows for more flexibility for partial and fractional voting. Upgrading users may get a compilation error that can be fixed by adding a return statement to the _countVote function.

Custom error changes

This version comes with changes to the custom error identifiers. Contracts previously depending on the following errors should be replaced accordingly:

• Replace Address.FailedInnerCall with Errors.FailedCall
• Replace Address.AddressInsufficientBalance with Errors.InsufficientBalance
• Replace Clones.Create2InsufficientBalance with Errors.InsufficientBalance
• Replace Clones.ERC1167FailedCreateClone with Errors.FailedDeployment
• Replace Clones.Create2FailedDeployment with Errors.FailedDeployment
• SafeERC20: Replace Address.AddressEmptyCode with SafeERC20FailedOperation if there is no code at the token's address.
• SafeERC20: Replace generic Error(string) with SafeERC20FailedOperation if the returned data can't be decoded as bool.
• SafeERC20: Replace generic SafeERC20FailedOperation with the revert message from the contract call if it fails.

Changes by category

General

• AccessManager, VestingWallet, TimelockController and ERC2771Forwarder: Added a public initializer function in their corresponding upgradeable variants. (#​5008)

Access

• AccessControlEnumerable: Add a getRoleMembers method to return all accounts that have role. (#​4546)
• AccessManager: Allow the onlyAuthorized modifier to restrict functions added to the manager. (#​5014)

Finance

• VestingWalletCliff: Add an extension of the VestingWallet contract with an added cliff. (#​4870)

Governance

• GovernorCountingFractional: Add a governor counting module that allows distributing voting power amongst 3 options (For, Against, Abstain). (#​5045)
• Votes: Set _moveDelegateVotes visibility to internal instead of private. (#​5007)

Proxy

• Clones: Add version of clone and cloneDeterministic that support sending value at creation. (#​4936)
• TransparentUpgradeableProxy: Make internal _proxyAdmin() getter have view visibility. (#​4688)
• ProxyAdmin: Fixed documentation for UPGRADE_INTERFACE_VERSION getter. (#​5031)

Tokens

• ERC1363: Add implementation of the token payable standard allowing execution of contract code after transfers and approvals. (#​4631)
• ERC20TemporaryApproval: Add an ERC-20 extension that implements temporary approval using transient storage, based on ERC7674 (draft). (#​5071)
• SafeERC20: Add "relaxed" function for interacting with ERC-1363 functions in a way that is compatible with EOAs. (#​4631)
• SafeERC20: Document risks of safeIncreaseAllowance and safeDecreaseAllowance when associated with ERC-7674. (#​5262)
• ERC721Utils and ERC1155Utils: Add reusable libraries with functions to perform acceptance checks on IERC721Receiver and IERC1155Receiver implementers. (#​4845)
• ERC1363Utils: Add helper similar to the existing ERC721Utils and ERC1155Utils. (#​5133)

Utils

• Arrays: add a sort functions for address[], bytes32[] and uint256[] memory arrays. (#​4846)
• Arrays: add new functions lowerBound, upperBound, lowerBoundMemory and upperBoundMemory for lookups in sorted arrays with potential duplicates. (#​4842)
• Arrays: deprecate findUpperBound in favor of the new lowerBound. (#​4842)
• Base64: Add encodeURL following section 5 of RFC4648 for URL encoding (#​4822)
• Comparator: A library of comparator functions, useful for customizing the behavior of the Heap structure. (#​5084)
• Create2: Bubbles up returndata from a deployed contract that reverted during construction. (#​5052)
• Create2, Clones: Mask computeAddress and cloneDeterministic outputs to produce a clean value for an address type (i.e. only use 20 bytes) (#​4941)
• Errors: New library of common custom errors. (#​4936)
• Hashes: A library with commonly used hash functions. (#​3617)
• Packing: Added a new utility for packing, extracting and replacing bytesXX values. (#​4992)
• Panic: Add a library for reverting with panic codes. (#​3298)
• ReentrancyGuardTransient: Added a variant of ReentrancyGuard that uses transient storage. (#​4988)
• Strings: Added a utility function for converting an address to checksummed string. (#​5067)
• SlotDerivation: Add a library of methods for derivating common storage slots. (#​4975)
• TransientSlot: Add primitives for operating on the transient storage space using a typed-slot representation. (#​4980)

Cryptography

• SignatureChecker: refactor isValidSignatureNow to avoid validating ECDSA signatures if there is code deployed at the signer's address. (#​4951)
• MerkleProof: Add variations of verify, processProof, multiProofVerify and processMultiProof (and equivalent calldata version) with support for custom hashing functions. (#​4887)
• P256: Library for verification and public key recovery of P256 (aka secp256r1) signatures. (#​4881)
• RSA: Library to verify signatures according to RFC 8017 Signature Verification Operation (#​4952)

Math

• Math: add an invMod function to get the modular multiplicative inverse of a number in Z/nZ. (#​4839)
• Math: Add modExp function that exposes the EIP-198 precompile. Includes uint256 and bytes memory versions. (#​3298)
• Math: Custom errors replaced with native panic codes. (#​3298)
• Math, SignedMath: Add a branchless ternary function that computescond ? a : b in constant gas cost. (#​4976)
• SafeCast: Add toUint(bool) for operating on bool values as uint256. (#​4878)

Structures

• CircularBuffer: Add a data structure that stores the last N values pushed to it. (#​4913)
• DoubleEndedQueue: Custom errors replaced with native panic codes. (#​4872)
• EnumerableMap: add UintToBytes32Map, AddressToAddressMap, AddressToBytes32Map and Bytes32ToAddressMap. (#​4843)
• Heap: A data structure that implements a heap-based priority queue. (#​5084)
• MerkleTree: A data structure that allows inserting elements into a merkle tree and updating its root hash. (#​3617)