How to handle function signature changes in SUI Move Package

Question

Im working on a SUI Move package and encountered an error when I tried to change a function signature. The error message is PackageUpgradeError { upgrade_error: IncompatibleUpgrade }. How can I upgrade the package with the new function signature without causing errors?

Forever_A-gator · Accepted Answer

You cant make changes to function signatures directly in a SUI Move package upgrade. Instead, you can add a new function with the desired signature and logic but you cannot remove the old function. Removing or changing existing function signatures isnt supported for upgrades, as this could break compatibility with existing packages or data dependent on the old function definitions. A useful workaround is to create a helper function or wrapper that includes the new functionality. Check the official documentation on SUI Move package upgrades for further guidance: https://docs.sui.io/concepts/sui-move-concepts/packages/upgrade#upgrade-requirements

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How to handle function signature changes in SUI Move Package

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