Results 1 issues of timou

```ts function fun(a?:string){ console.log(a); } fun() ``` function fun(a?:string){ ^ SyntaxError: Unexpected token '?' at ESMLoader.moduleStrategy (node:internal/modules/esm/translators:119:18) at ESMLoader.moduleProvider (node:internal/modules/esm/loader:468:14) at async link (node:internal/modules/esm/module_job:68:21) Node.js v18.16.1