Websocket provider subscribe documentation

Hi, I am trying to use the WebSocketProvider to call eth_subscribe similar to web3 https://web3js.readthedocs.io/en/v1.2.11/web3-eth-subscribe.html?highlight=subscribe#subscribe-logs

How do I use the WebSocketProvider class to achieve this? I see the _subscribe method here https://github.com/ethers-io/ethers.js/blob/master/packages/providers/src.ts/websocket-provider.ts#L182 however I am not sure what object is expected as the second argument.

Specifically, I am trying to not use the on(..) syntax so I have finer grained control over the order of my callback execution.

[mpereiraesaa]

What about if he has his custom geth fork with a new subscription function added and he wants to subscribe to that? not only those “blocks”, “pending” already documented in the docs.

[ShinyDAO]

Bumping this because I’m in the situation that @mpereiraesaa mentions. I’d like to use this alchemy subscription: “alchemy_filteredNewFullPendingTransactions” but I’m not sure how to actually use it with WebSocketProvider.

If I try:

stream.on("alchemy_filteredNewFullPendingTransactions", (tx) => {

I get an “unhandled” log message. And it’s not clear how to provide the arguments it needs as well.