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Change Impact is one of Understand's built-in reports — run it on your own code from the GUI, or headlessly with und report.

Change Impact

Languages: Any
Targets: Functions
Shows entities impacted by changing a given entity.

This report will show all entities that would be impacted by a change to a given entity. For example, it will show all functions called by a function, and all functions that call those functions, to a specified depth. This can be used to get a rough estimate of the impact of proposed changes.