NodeJS Buffer returns different result for same operation

I've recently switched to this library on a @ionic/vue app and since then some of my unit tests fail since they run under node environment. The following is an example that returns a different value depending on where it runs on.

```html

Buffer




const { Buffer } = window.buffer;
const intInBase64 = "/w==";

function decodeBase64ToInt(value) {
const buf = Buffer.from(value, 'base64');
const bytes = new Int8Array(buf.buffer);

return bytes[0];
}

console.log(decodeBase64ToInt(intInBase64))

```

```js
const intInBase64 = "/w==";

function decodeBase64ToInt(value) {
const buf = Buffer.from(value, 'base64');
const bytes = new Int8Array(buf.buffer);

return bytes[0];
}

console.log(decodeBase64ToInt(intInBase64))
```

Running the HTML snippet on the browser will return `-1` and running the second snippet with `node` will return `47`.
How come?