using System using System Collections using System Collections Generic

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using Object = UnityEngine.Object;

public class ComponentInjector : MonoBehaviour {
    private void Start() {
        AssetDatabase.StartAssetEditing();
        string[] guids = AssetDatabase.FindAssets(" t:GameObject", new string[] {"Assets/Prefabs"});
        foreach (string g in guids) {
            string path = AssetDatabase.GUIDToAssetPath(g);
            Object prefab = AssetDatabase.LoadAssetAtPath(path, typeof(GameObject));
            GameObject prefabAsObject = prefab as GameObject;
            prefabAsObject.AddComponent<SpriteRenderer>();
        }
        AssetDatabase.StopAssetEditing();
        AssetDatabase.SaveAssets();
    }
}