expressStaticGzip does not compress files

Question

I would like to compress js and css files. I am using the [expressStaticGzip][1] module.

As you might have figured out, the response is not being compressed (at all). Neither Brotli nor Gzip is being used.

The (relevant) code in my app.js looks like this

const expressStaticGzip = require('express-static-gzip'); //compression

//-- compression --//
app.use('/public', expressStaticGzip(path.join(__dirname, 'static', 'public'), {
    enableBrotli: true, // Enable Brotli compression
    orderPreference: ['br', 'gz'], // Prefer Brotli over gzip
}));

app.use(express.static('static'));

My folder structure looks like this:

static
--public
----css
----js
app.js

As far as I understand, any request made to public should compress the files into br or gzip, whichever the client supports.

If we look at the devTools, network tab this is shown:

GET 
    https://localhost/public/css/main/main.min.css

Response Headers:
Accept-Ranges
    bytes
Cache-Control
    public, max-age=0
Connection
    keep-alive
Content-Length
    14333
Content-Type
    text/css; charset=UTF-8
Date
    Fri, 08 Sep 2023 13:48:30 GMT
ETag
    W/"37fd-18a657d2170"
Keep-Alive
    timeout=5
Last-Modified
    Tue, 05 Sep 2023 13:16:54 GMT
X-Powered-By
    Express

Request Headers:
Accept
    text/css,*/*;q=0.1
Accept-Encoding
    gzip, deflate, br
Accept-Language
    en-GB,en;q=0.5
Cache-Control
    no-cache
Connection
    keep-alive
DNT
    1
Host
    localhost
Pragma
    no-cache
Referer
    https://localhost/refering/page
Sec-Fetch-Dest
    style
Sec-Fetch-Mode
    no-cors
Sec-Fetch-Site
    same-origin
User-Agent
    Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/117.0

GET https://localhost/public/css/main/main.min.css

the GET contains public, so it should be compressed.

Accept-Encoding gzip, deflate, br

gzip and br are accepted as encoding.

So I am wondering why doesn't this work. Any help, tips or questions for clarification are welcome.

Thank you.

Edit

Since I couldn't get it to work, I'm now using compression. Works out of the box.

const compression = require('compression') //compression

app.use(compression());

I would still like to serve Brotli if possible, so I will leave the question open for now, if someone can point me in the right direction. [1]: https://www.npmjs.com/package/express-static-gzip