chore: Code changes & formatting and linting (#3552)

* Do some code changes & run prettier and eslint

* Fix test:test-type script

* Apply code review suggestions

* update heartbeat interval & add a reason for the specific value

* Fix husky error

* Update to TS 5.5

And use ${configDir}

* Fix test.json tsconfig base

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Co-authored-by: Skillz4Killz <23035000+Skillz4Killz@users.noreply.github.com>

examples/bigbot/src/config.ts

@@ -63,7 +63,7 @@ export const GATEWAY_INTENTS = Intents.Guilds | Intents.GuildMessages
 // Helper functions
 
 function assertEnv(env: string): string {
-  if (process.env[env]) return process.env[env]!
+  if (process.env[env]) return process.env[env]
 
   throw new TypeError(`The '${env}' environment variable must be set`)
 }