Cannot access "fs.ReadStream" in client code.

[FrancescoMussi]

I am trying to set it up.
Following the docs with basic example.

import * as finnhub from 'finnhub'
const api_key = finnhub.ApiClient.instance.authentications['api_key'];
api_key.apiKey = "my_api_key"
const finnhubClient = new finnhub.DefaultApi()

finnhubClient.stockCandles("AAPL", "D", 1590988249, 1591852249, (error, data, response) => {
    console.log(data)
});

I keep getting the following error:

Uncaught Error: Module "fs" has been externalized for browser compatibility. Cannot access "fs.ReadStream" in client code.

Same error with other api calls (symbolSearch, stockSymbols ...)

Do you know why?