Hi all, We are trying to write a deploy script using hardhat upgrades plugin and we see this error @openzeppelin/contracts-upgradeable/token/ERC20/ERC20SnapshotUpgradeable.sol:52 Defining structs like 'Snapshots' is not yet supported. If you have manually checked for storage layout compatibility, …

In this case, since the struct is a part of @openzeppelin/contracts-upgradeable, we're the ones that will make sure to maintain storage compatibility. We mention this briefly in Using with Upgrades : a separate package called @openzeppelin/contracts-upgradeable [...] we check for storage incompati…

Defining structs like 'Snapshots' is not yet supported when deploying ERC20SnapshotUpgradeable

Support Upgrades

frangio January 27, 2021, 6:51pm 8

@ethicraul The latest release of the Upgrades plugin supports structs, and the unsafe flag is no longer needed. I hope you can try it out. Take a look at the announcement for more details!

2 Likes

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Defining structs like 'Snapshots' is not yet supported when deploying ERC20SnapshotUpgradeable

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