Is there a way to attach a script in a game object in editor mode before runtime?

I'm creating a plug-in that imports a data source into Unity from a web authoring tool like Scratch, and configures it in hierachy same as a web authoring tool.
All assets must be registered in the hiraraki before runtime.
I finished the importing the script from the outside into the asset folder.
However, I can not attach the script on gameObject in hierachy.
Is there a way to attach a script in a game object in editor mode before runtime?

Code (CSharp):

1. string sourceFile = "D:\\Test1.cs";
2. string destFile = "D:\\Dongguk_plugin\\Assets\\customAsset\\scrip\\Test1.cs";
3. System.IO.File.Copy(sourceFile, destFile, false);
4. string assetPath = "Assets/customAsset/scrip/Test1.cs";
5. AssetDatabase.ImportAsset(assetPath, ImportAssetOptions.Default);
6. AssetDatabase.SaveAssets();
7. AssetDatabase.Refresh();
8. MonoScript script = AssetDatabase.LoadAssetAtPath<MonoScript>(unityPath);
9. Debug.Log("script -- > " + script);
10. string[] results = AssetDatabase.FindAssets("Test1");
11. foreach (string guid in results)
12. {
13.         unityPath = AssetDatabase.GUIDToAssetPath(guid);
14.         Debug.Log("unityPath : " + unityPath);
15. }
16. GameObject parentObj = new GameObject("TestParentObj");
17. // addComponent 1
18. Type type;
19. if (script != null)
20. {
21.         //this line debugs "AddComponent asking for invalid type" because script.GetClass() returns null
22.         type = script.GetType();
23.      
24.         if (type != null)
25.         {
26.                 Debug.Log("1. script type -- > " + type);
27.                 parentObj.AddComponent(type);
28.         }
29.         else
30.         {
31.                 Debug.Log("1. script type -- > null");
32.         }
33.      
34. }
35. // addComponent 2
36. type = Type.GetType("Test1");
37. if (type != null)
38. {
39.         parentObj.AddComponent(type);
40. }
41. else
42. {
43.         Debug.Log("2. type -- > null");
44. }
45. // addComponent 3
46. MonoScript monoScript = (MonoScript)FindObjectOfType(typeof(MonoScript));
47. if (monoScript)
48.         Debug.Log("MonoScript object found: " + monoScript.name);
49. else
50.         Debug.Log("No MonoScript object could be found");