Version: 2019.1 (switch to 2018.3 or 2017.4)
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AssetModificationProcessor.OnWillDeleteAsset(string,RemoveAssetOptions)

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Description

This is called by Unity when it is about to delete an asset from disk.

If this is implemented, it allows you to delete the asset yourself. Deletion of a file can be prevented by returning AssetDeleteResult.FailedDelete You should not call any Unity AssetDatabase api from within this callback, preferably keep to file operations or VCS apis.

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Copyright © 2019 Unity Technologies. Publication: 2019.1-002V. Built: 2019-04-15.
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