From c86143bbfecc0a4cdec48e5917c358562f83450e Mon Sep 17 00:00:00 2001
From: Bridgerz <bridgerzoske@gmail.com>
Date: Thu, 5 Sep 2024 17:52:53 -0700
Subject: [PATCH] Add storage gap variable to the CommitteeUpgradeable contract
 (#19228)

## Description

In the case the `CommitteeUpgradeable` contract needs to include more
storage variables, a storage gap variable is needed to reserve storage
slots so the child contract state is not overwritten.

## Test plan

Contract upgrade unit tests
---
 bridge/evm/contracts/utils/CommitteeUpgradeable.sol | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bridge/evm/contracts/utils/CommitteeUpgradeable.sol b/bridge/evm/contracts/utils/CommitteeUpgradeable.sol
index 4e415174d5335..af5d2839749a9 100644
--- a/bridge/evm/contracts/utils/CommitteeUpgradeable.sol
+++ b/bridge/evm/contracts/utils/CommitteeUpgradeable.sol
@@ -20,6 +20,8 @@ abstract contract CommitteeUpgradeable is
     /* ========== STATE VARIABLES ========== */
 
     bool private _upgradeAuthorized;
+    // upgradeablity storage gap
+    uint256[50] private __gap;
 
     /* ========== INITIALIZER ========== */