[bugreport] TypeError: undefined is not an object (evaluating 'this.raw')

[eelkevdbos]

When destructuring the ws param in open(ws) { }, the method starts throwing: TypeError: undefined is not an object (evaluating 'this.raw'). It looks vaguely related to #174.

My environment

{
  "devDependencies": {
    "bun-types": "^1.0.1"
  },
  "peerDependencies": {
    "typescript": "^5.2.2"
  },
  "dependencies": {
    "@elysiajs/html": "^0.7.0",
    "@kitajs/html": "^2.2.2",
    "@kitajs/ts-html-plugin": "^1.0.2",
    "elysia": "^0.7.3"
  }
}

Snippet to reproduce:

new Elysia()
  .ws('/ws/:channel', {
    params: t.Object({
      channel: t.String(),
    }),
    open({ subscribe, data: { params } }) {
      subscribe(params.channel) // throws TypeError
    },
  })

Snippet that does not throw:

new Elysia()
  .ws('/ws/:channel', {
    params: t.Object({
      channel: t.String(),
    }),
    open(ws) {
      ws.subscribe(ws.data.params.channel)
    },
  })

[erra0002]

This is expected behavior, destructuring assignment is not "supported" in javascript for class methods like subscribe, because the context and therefore "this" is lost. You have to use ws.subsribe(...)