diff --git a/index.js b/index.js
index fc6a335..f5ee1f4 100644
--- a/index.js
+++ b/index.js
@@ -2,7 +2,6 @@ import Debug from 'debug';
 import exitHook from 'exit-hook';
 import mssql from 'mssql';
 const debug = Debug('mssql-multi-pool:index');
-let shutdownIsInitialized = false;
 const POOLS = new Map();
 function getPoolKey(config) {
     return `${config.user ?? ''}@${config.server}/${config.options?.instanceName ?? ''};${config.database ?? ''}`;
@@ -10,7 +9,7 @@ function getPoolKey(config) {
 export async function connect(config) {
     const poolKey = getPoolKey(config);
     let pool = POOLS.get(poolKey);
-    if (pool === undefined || !pool.connected) {
+    if (!(pool?.connected ?? false)) {
         debug(`New database connection: ${poolKey}`);
         pool = await new mssql.ConnectionPool(config).connect();
         POOLS.set(poolKey, pool);
@@ -36,14 +35,11 @@ export async function releaseAll() {
 export function getPoolCount() {
     return POOLS.size;
 }
-if (!shutdownIsInitialized) {
-    debug('Initializing shutdown hooks.');
-    exitHook(() => {
-        debug('Running shutdown hooks.');
-        void releaseAll();
-    });
-    shutdownIsInitialized = true;
-}
+debug('Initializing shutdown hooks.');
+exitHook(() => {
+    debug('Running shutdown hooks.');
+    void releaseAll();
+});
 export default {
     connect,
     releaseAll,
diff --git a/index.ts b/index.ts
index 0d9d2c2..73bb194 100644
--- a/index.ts
+++ b/index.ts
@@ -4,7 +4,6 @@ import mssql from 'mssql'
 
 const debug = Debug('mssql-multi-pool:index')
 
-let shutdownIsInitialized = false
 const POOLS = new Map<string, mssql.ConnectionPool>()
 
 function getPoolKey(config: mssql.config): string {
@@ -16,8 +15,8 @@ function getPoolKey(config: mssql.config): string {
 /**
  * Connect to a MSSQL database.
  * Creates a new connection if the configuration does not match a previously seen configuration.
- * @param {mssql.config} config - MSSQL configuration.
- * @returns {mssql.ConnectionPool} - A MSSQL connection pool.
+ * @param config - MSSQL configuration.
+ * @returns A MSSQL connection pool.
  */
 export async function connect(
   config: mssql.config
@@ -26,15 +25,14 @@ export async function connect(
 
   let pool = POOLS.get(poolKey)
 
-  // eslint-disable-next-line @typescript-eslint/prefer-optional-chain
-  if (pool === undefined || !pool.connected) {
+  if (!(pool?.connected ?? false)) {
     debug(`New database connection: ${poolKey}`)
 
     pool = await new mssql.ConnectionPool(config).connect()
     POOLS.set(poolKey, pool)
   }
 
-  return pool
+  return pool as mssql.ConnectionPool
 }
 
 /**
@@ -61,7 +59,7 @@ export async function releaseAll(): Promise<void> {
 
 /**
  * Retrieves the number of currently managed connection pools.
- * @returns {number} - The number of pools.
+ * @returns The number of pools.
  */
 export function getPoolCount(): number {
   return POOLS.size
@@ -70,16 +68,17 @@ export function getPoolCount(): number {
 /**
  * Initialize shutdown.
  */
-if (!shutdownIsInitialized) {
-  debug('Initializing shutdown hooks.')
 
-  exitHook(() => {
-    debug('Running shutdown hooks.')
-    void releaseAll()
-  })
+debug('Initializing shutdown hooks.')
 
-  shutdownIsInitialized = true
-}
+exitHook(() => {
+  debug('Running shutdown hooks.')
+  void releaseAll()
+})
+
+/*
+ * Exports
+ */
 
 export default {
   connect,
diff --git a/test/config.githubActions.ts b/test/config.githubActions.ts
index 1702bd8..51751ef 100644
--- a/test/config.githubActions.ts
+++ b/test/config.githubActions.ts
@@ -8,6 +8,7 @@ import type { config as ConnectionPoolConfig } from '../index.js'
 export const config: ConnectionPoolConfig = {
   server: 'localhost',
   user: 'sa',
+  // eslint-disable-next-line sonarjs/no-hardcoded-credentials
   password: 'dbatools.I0',
   database: 'master',
   options: {
diff --git a/test/test.ts b/test/test.ts
index 9dd6282..715c2f2 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -15,6 +15,7 @@ await describe('mssql-multi-pool', async () => {
 
     await pool.request().query('select 1')
 
+    // eslint-disable-next-line @typescript-eslint/no-magic-numbers
     assert.strictEqual(getPoolCount(), 1)
   })
 
@@ -31,6 +32,7 @@ await describe('mssql-multi-pool', async () => {
   await it('Releases all pools', async () => {
     await releaseAll()
 
+    // eslint-disable-next-line @typescript-eslint/no-magic-numbers
     assert.strictEqual(getPoolCount(), 0)
   })
 })