@openzeppelin/contracts - npm Package Versions

3.3.0 (2020-11-26)

• Now supports both Solidity 0.6 and 0.7. Compiling with solc 0.7 will result in warnings. Install the solc-0.7 tag to compile without warnings.
• Address: added functionStaticCall, similar to the existing functionCall. (#2333)
• TimelockController: added a contract to augment access control schemes with a delay. (#2354)
• EnumerableSet: added Bytes32Set, for sets of bytes32. (#2395)

3.2.2-solc-0.7 (2020-10-28)

• Resolve warnings introduced by Solidity 0.7.4. (#2396)

3.2.1-solc-0.7 (2020-09-15)

• ERC777: Remove a warning about function state visibility in Solidity 0.7. (#2327)

3.2.0 (2020-09-10)

New features

• Proxies: added the proxy contracts from OpenZeppelin SDK. (#2335)

Proxy changes with respect to OpenZeppelin SDK

Aside from upgrading them from Solidity 0.5 to 0.6, we've changed a few minor things from the proxy contracts as they were found in OpenZeppelin SDK.

• UpgradeabilityProxy was renamed to UpgradeableProxy.
• AdminUpgradeabilityProxy was renamed to TransparentUpgradeableProxy.
• Proxy._willFallback was renamed to Proxy._beforeFallback.
• UpgradeabilityProxy._setImplementation and AdminUpgradeabilityProxy._setAdmin were made private.

Improvements

• Address.isContract: switched from extcodehash to extcodesize for less gas usage. (#2311)

Breaking changes

• ERC20Snapshot: switched to using _beforeTokenTransfer hook instead of overriding ERC20 operations. (#2312)

This small change in the way we implemented ERC20Snapshot may affect users who are combining this contract with other ERC20 flavors, since it no longer overrides _transfer, _mint, and _burn. This can result in having to remove Solidity override(...) specifiers in derived contracts for these functions, and to instead have to add it for _beforeTokenTransfer. See Using Hooks in the documentation.