This is my own version of Unity MonoBehavior script Template

81-C# Script-NewBehaviourScript.cs

#region Author
/////////////////////////////////////////
//   YOUR NAME --> #SCRIPTNAME#
//   Property of Headcrab
/////////////////////////////////////////
#endregion
using UnityEngine;

public class #SCRIPTNAME# : MonoBehaviour
{
    #region Variables
    #endregion Variables

    ///////////////////////////////////////////////////////////

    #region Unity's functions
    /// <summary>
    /// Start is called before the first frame update
    /// </summary>
    private void Start()
    {
        CheckIfSetUp();
    }

    /// <summary>
    /// Update is called once per frame
    /// </summary>
    private void Update()
    {

    }
    #endregion Unity's functions

    ///////////////////////////////////////////////////////////

    #region Functions
    #endregion Functions

    ///////////////////////////////////////////////////////////

    #region Accessors
    #endregion Accessors

    ///////////////////////////////////////////////////////////

    #region Utils
    /// <summary>
    /// Checks if all variables are set up correctly, otherwise close Editor
    /// </summary>
    private void CheckIfSetUp()
    {
#if UNITY_EDITOR
        bool isSetUp = true;

        if (!randomVariable)
        {
            Debug.LogError($"<b>Random Variable</b> cannot be null in <color=#00f> {name} </color>", gameObject);
            isSetUp = false;
        }

        UnityEditor.EditorApplication.isPlaying = isSetUp;
#endif
    }
    #endregion Utils
}