fix(treaty2): ws response data type

[ap0nia]

Summary

EdenWS has the wrong event.data type for all subscription-related listeners.

Expected

When defining a response for the message, Eden should show that same type in the event.data for the callback argument in EdenWS.on, EdenWS.subscribe, and EdenWS.addEventListener.

Solution

• Expects to receive the actual data type as the second generic here
• Currently, it is being provided the entire response here
• To fix this, the EdenWS class should provided Schema['response'][200] as the data type for the second generic argument in Treaty.WSEvent

type Response = {
  // 200 is the HTTP code, and string is the actual response data.
  200: string
}

type EdenWSEvent_WRONG = Treaty.WSEvent<keyof WebSocketEventMap, Response>

type EdenWSEvent_CORRECT = Treaty.WSEvent<keyof WebSocketEventMap, Response[200]>

Minimal Reproduction

import { Elysia, t } from 'elysia'
import { treaty } from '@elysiajs/eden'

const app = new Elysia().ws('/chat', {
    body: t.Object({ message: t.String() }),
    response: t.String(),
    message: async (_ws, body) => {
        body.message
    }
})

const api = treaty<typeof app>()

const subscription = api.chat.subscribe()

subscription.on('message', (event) => {
    event.data
    // ^? is { 200: { message: string } } instead of { message: string }
})