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Libraries for ERC-4337 compatible dynamic arrays in storage.

Motivation

Dynamic array are not easily compatible with ERC-4337 associated storage access rules. Even if they are a value in a mapping, where the Smart Account address is the key, the final keccak won't be keccak(A||x)+n as it would be for a static array, but keccak(keccak(A||x))+n instead.

What's included

  • AssociatedArrayLib.sol: Library for dynamic arrays that are associated with an address as per ERC-7562. It is achieved by using keccak(A||x) as the starting slot for the array.
  • EnumerableSet4337.sol: Fork of OZ's EnumerableSet that makes all storage access ERC-4337 compliant via associated storage. Stores indexes in a mapping making access to a given value easier.
  • EnumerableMap4337.sol: Library for managing an enumerable variant of Solidity's mapping type.

Disclaimer

These libraries are provided as-is, without any warranty or guarantee of any kind. Use them at your own risk.