ScriptReference/AssetPostprocessor

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ScriptReference/AssetPostprocessor

https://docs.unity3d.com/ScriptReference/AssetPostprocessor.html

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Comment by Logan:

If looking to only run on "first time" asset import, then assetImporter.importSettingsMissing will tell you whether this is the first time. That way you can run AssetPostprocessor once to create initial settings, and still allow user to make other custom modifications before checking into version control.
If others sync down with a .meta file, the importSettingsMissing will return false.