Error when has async function

I just tried this code `test.js`:

```js
async function foo() {
console.log('Hello world!')
}

hello()

```

and run `center test.js`

it tells me:

```
// other logs...
at IO.unsafePerformIO (/Users/xxx/.nvm/versions/node/v14.17.6/lib/node_modules/center-code/node_modules/ramda/dist/ramda.js:44:27) {
lineNumber: 1,
description: 'Unexpected token function',
index: 6,
message: 'Unable to perform highlight. The code contained syntax errors: Line 1: Unexpected token function'
}
```