SporeLab

public static class AssetIndexer
{
    // Key: asset path; Value: asset dependencies
    private static Dictionary<string, string[]> assetIndex = new Dictionary<string, string[]>();

    /// <summary>
    /// Initializes asset index by caching dependencies for all valid asset paths.
    /// </summary>
    internal static void Initialize()
    {
        assetIndex.Clear();
        var paths = AssetDatabase.GetAllAssetPaths()
                                  .Where(path => path.StartsWith("Assets/"))  // Must be inside project
                                  .Where(path => !AssetDatabase.IsValidFolder(path))  // Must not be a folder
                                  .Where(path => !SporeLab.Configuration.Ignored(path)) // Must not be user-ignored
                                  .Where(path => !SporeLab.Configuration.ContainsIgnoredPath(path)) // Must not be subpath of a user-ignored path
                                  .ToArray();


        for (int i = 0; i < paths.Length; i++)
        {
            AddAsset(paths[i]);
        }
    }

    /// <summary>
    /// Gets the asset's dependencies.
    /// </summary>
    /// <param name="path">The asset path.</param>
    /// <returns>An array of asset paths that the input asset path depends on.</returns>
    internal static string[] TryGetDependencies(string path)
    {
        if (assetIndex.TryGetValue(path, out string[] dependencies))
        {
            return dependencies;
        }

        // On-demand caching
        AddAsset(path);
        return assetIndex[path];
    }

    /// <summary>
    /// Updates assets' dependencies.
    /// </summary>
    /// <param name="paths">The array of asset paths.</param>
    internal static void UpdateDependencies(string[] paths)
    {
        for (int i = 0; i < paths.Length; i++)
        {
            assetIndex[paths[i]] = AssetDatabase.GetDependencies(paths[i], true);
        }
    }

    static void AddAsset(string path)
    {
        if (!assetIndex.ContainsKey(path))
        {
            assetIndex.Add(path, AssetDatabase.GetDependencies(path, true));
        }
    }
}