ソースコード

using System.Linq;
using UnityEditor;
using UnityEngine;

internal sealed class Example : AssetPostprocessor
{
    private const string PATH = "ProjectSettings/EditorBuildSettings.asset";

    private static void OnPostprocessAllAssets
    (
        string[] importedAssets,
        string[] deletedAssets,
        string[] movedAssets,
        string[] movedFromAssetPaths
    )
    {
        var isChangedScenes = importedAssets.Contains( PATH );

        Debug.Log( isChangedScenes );
    }
}