Updated the files.

my-app/node_modules/undici/lib/websocket/connection.js

@@ -0,0 +1,292 @@
+'use strict'
+
+const diagnosticsChannel = require('diagnostics_channel')
+const { uid, states } = require('./constants')
+const {
+  kReadyState,
+  kSentClose,
+  kByteParser,
+  kReceivedClose
+} = require('./symbols')
+const { fireEvent, failWebsocketConnection } = require('./util')
+const { CloseEvent } = require('./events')
+const { makeRequest } = require('../fetch/request')
+const { fetching } = require('../fetch/index')
+const { Headers } = require('../fetch/headers')
+const { getGlobalDispatcher } = require('../global')
+const { kHeadersList } = require('../core/symbols')
+
+const channels = {}
+channels.open = diagnosticsChannel.channel('undici:websocket:open')
+channels.close = diagnosticsChannel.channel('undici:websocket:close')
+channels.socketError = diagnosticsChannel.channel('undici:websocket:socket_error')
+
+/** @type {import('crypto')} */
+let crypto
+try {
+  crypto = require('crypto')
+} catch {
+
+}
+
+/**
+ * @see https://websockets.spec.whatwg.org/#concept-websocket-establish
+ * @param {URL} url
+ * @param {string|string[]} protocols
+ * @param {import('./websocket').WebSocket} ws
+ * @param {(response: any) => void} onEstablish
+ * @param {Partial<import('../../types/websocket').WebSocketInit>} options
+ */
+function establishWebSocketConnection (url, protocols, ws, onEstablish, options) {
+  // 1. Let requestURL be a copy of url, with its scheme set to "http", if url’s
+  //    scheme is "ws", and to "https" otherwise.
+  const requestURL = url
+
+  requestURL.protocol = url.protocol === 'ws:' ? 'http:' : 'https:'
+
+  // 2. Let request be a new request, whose URL is requestURL, client is client,
+  //    service-workers mode is "none", referrer is "no-referrer", mode is
+  //    "websocket", credentials mode is "include", cache mode is "no-store" ,
+  //    and redirect mode is "error".
+  const request = makeRequest({
+    urlList: [requestURL],
+    serviceWorkers: 'none',
+    referrer: 'no-referrer',
+    mode: 'websocket',
+    credentials: 'include',
+    cache: 'no-store',
+    redirect: 'error'
+  })
+
+  // Note: undici extension, allow setting custom headers.
+  if (options.headers) {
+    const headersList = new Headers(options.headers)[kHeadersList]
+
+    request.headersList = headersList
+  }
+
+  // 3. Append (`Upgrade`, `websocket`) to request’s header list.
+  // 4. Append (`Connection`, `Upgrade`) to request’s header list.
+  // Note: both of these are handled by undici currently.
+  // https://github.com/nodejs/undici/blob/68c269c4144c446f3f1220951338daef4a6b5ec4/lib/client.js#L1397
+
+  // 5. Let keyValue be a nonce consisting of a randomly selected
+  //    16-byte value that has been forgiving-base64-encoded and
+  //    isomorphic encoded.
+  const keyValue = crypto.randomBytes(16).toString('base64')
+
+  // 6. Append (`Sec-WebSocket-Key`, keyValue) to request’s
+  //    header list.
+  request.headersList.append('sec-websocket-key', keyValue)
+
+  // 7. Append (`Sec-WebSocket-Version`, `13`) to request’s
+  //    header list.
+  request.headersList.append('sec-websocket-version', '13')
+
+  // 8. For each protocol in protocols, combine
+  //    (`Sec-WebSocket-Protocol`, protocol) in request’s header
+  //    list.
+  for (const protocol of protocols) {
+    request.headersList.append('sec-websocket-protocol', protocol)
+  }
+
+  // 9. Let permessageDeflate be a user-agent defined
+  //    "permessage-deflate" extension header value.
+  // https://github.com/mozilla/gecko-dev/blob/ce78234f5e653a5d3916813ff990f053510227bc/netwerk/protocol/websocket/WebSocketChannel.cpp#L2673
+  // TODO: enable once permessage-deflate is supported
+  const permessageDeflate = '' // 'permessage-deflate; 15'
+
+  // 10. Append (`Sec-WebSocket-Extensions`, permessageDeflate) to
+  //     request’s header list.
+  // request.headersList.append('sec-websocket-extensions', permessageDeflate)
+
+  // 11. Fetch request with useParallelQueue set to true, and
+  //     processResponse given response being these steps:
+  const controller = fetching({
+    request,
+    useParallelQueue: true,
+    dispatcher: options.dispatcher ?? getGlobalDispatcher(),
+    processResponse (response) {
+      // 1. If response is a network error or its status is not 101,
+      //    fail the WebSocket connection.
+      if (response.type === 'error' || response.status !== 101) {
+        failWebsocketConnection(ws, 'Received network error or non-101 status code.')
+        return
+      }
+
+      // 2. If protocols is not the empty list and extracting header
+      //    list values given `Sec-WebSocket-Protocol` and response’s
+      //    header list results in null, failure, or the empty byte
+      //    sequence, then fail the WebSocket connection.
+      if (protocols.length !== 0 && !response.headersList.get('Sec-WebSocket-Protocol')) {
+        failWebsocketConnection(ws, 'Server did not respond with sent protocols.')
+        return
+      }
+
+      // 3. Follow the requirements stated step 2 to step 6, inclusive,
+      //    of the last set of steps in section 4.1 of The WebSocket
+      //    Protocol to validate response. This either results in fail
+      //    the WebSocket connection or the WebSocket connection is
+      //    established.
+
+      // 2. If the response lacks an |Upgrade| header field or the |Upgrade|
+      //    header field contains a value that is not an ASCII case-
+      //    insensitive match for the value "websocket", the client MUST
+      //    _Fail the WebSocket Connection_.
+      if (response.headersList.get('Upgrade')?.toLowerCase() !== 'websocket') {
+        failWebsocketConnection(ws, 'Server did not set Upgrade header to "websocket".')
+        return
+      }
+
+      // 3. If the response lacks a |Connection| header field or the
+      //    |Connection| header field doesn't contain a token that is an
+      //    ASCII case-insensitive match for the value "Upgrade", the client
+      //    MUST _Fail the WebSocket Connection_.
+      if (response.headersList.get('Connection')?.toLowerCase() !== 'upgrade') {
+        failWebsocketConnection(ws, 'Server did not set Connection header to "upgrade".')
+        return
+      }
+
+      // 4. If the response lacks a |Sec-WebSocket-Accept| header field or
+      //    the |Sec-WebSocket-Accept| contains a value other than the
+      //    base64-encoded SHA-1 of the concatenation of the |Sec-WebSocket-
+      //    Key| (as a string, not base64-decoded) with the string "258EAFA5-
+      //    E914-47DA-95CA-C5AB0DC85B11" but ignoring any leading and
+      //    trailing whitespace, the client MUST _Fail the WebSocket
+      //    Connection_.
+      const secWSAccept = response.headersList.get('Sec-WebSocket-Accept')
+      const digest = crypto.createHash('sha1').update(keyValue + uid).digest('base64')
+      if (secWSAccept !== digest) {
+        failWebsocketConnection(ws, 'Incorrect hash received in Sec-WebSocket-Accept header.')
+        return
+      }
+
+      // 5. If the response includes a |Sec-WebSocket-Extensions| header
+      //    field and this header field indicates the use of an extension
+      //    that was not present in the client's handshake (the server has
+      //    indicated an extension not requested by the client), the client
+      //    MUST _Fail the WebSocket Connection_.  (The parsing of this
+      //    header field to determine which extensions are requested is
+      //    discussed in Section 9.1.)
+      const secExtension = response.headersList.get('Sec-WebSocket-Extensions')
+
+      if (secExtension !== null && secExtension !== permessageDeflate) {
+        failWebsocketConnection(ws, 'Received different permessage-deflate than the one set.')
+        return
+      }
+
+      // 6. If the response includes a |Sec-WebSocket-Protocol| header field
+      //    and this header field indicates the use of a subprotocol that was
+      //    not present in the client's handshake (the server has indicated a
+      //    subprotocol not requested by the client), the client MUST _Fail
+      //    the WebSocket Connection_.
+      const secProtocol = response.headersList.get('Sec-WebSocket-Protocol')
+
+      if (secProtocol !== null && secProtocol !== request.headersList.get('Sec-WebSocket-Protocol')) {
+        failWebsocketConnection(ws, 'Protocol was not set in the opening handshake.')
+        return
+      }
+
+      response.socket.on('data', onSocketData)
+      response.socket.on('close', onSocketClose)
+      response.socket.on('error', onSocketError)
+
+      if (channels.open.hasSubscribers) {
+        channels.open.publish({
+          address: response.socket.address(),
+          protocol: secProtocol,
+          extensions: secExtension
+        })
+      }
+
+      onEstablish(response)
+    }
+  })
+
+  return controller
+}
+
+/**
+ * @param {Buffer} chunk
+ */
+function onSocketData (chunk) {
+  if (!this.ws[kByteParser].write(chunk)) {
+    this.pause()
+  }
+}
+
+/**
+ * @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol
+ * @see https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.4
+ */
+function onSocketClose () {
+  const { ws } = this
+
+  // If the TCP connection was closed after the
+  // WebSocket closing handshake was completed, the WebSocket connection
+  // is said to have been closed _cleanly_.
+  const wasClean = ws[kSentClose] && ws[kReceivedClose]
+
+  let code = 1005
+  let reason = ''
+
+  const result = ws[kByteParser].closingInfo
+
+  if (result) {
+    code = result.code ?? 1005
+    reason = result.reason
+  } else if (!ws[kSentClose]) {
+    // If _The WebSocket
+    // Connection is Closed_ and no Close control frame was received by the
+    // endpoint (such as could occur if the underlying transport connection
+    // is lost), _The WebSocket Connection Close Code_ is considered to be
+    // 1006.
+    code = 1006
+  }
+
+  // 1. Change the ready state to CLOSED (3).
+  ws[kReadyState] = states.CLOSED
+
+  // 2. If the user agent was required to fail the WebSocket
+  //    connection, or if the WebSocket connection was closed
+  //    after being flagged as full, fire an event named error
+  //    at the WebSocket object.
+  // TODO
+
+  // 3. Fire an event named close at the WebSocket object,
+  //    using CloseEvent, with the wasClean attribute
+  //    initialized to true if the connection closed cleanly
+  //    and false otherwise, the code attribute initialized to
+  //    the WebSocket connection close code, and the reason
+  //    attribute initialized to the result of applying UTF-8
+  //    decode without BOM to the WebSocket connection close
+  //    reason.
+  // TODO: process.nextTick
+  fireEvent('close', ws, CloseEvent, {
+    wasClean, code, reason
+  })
+
+  if (channels.close.hasSubscribers) {
+    channels.close.publish({
+      websocket: ws,
+      code,
+      reason
+    })
+  }
+}
+
+function onSocketError (error) {
+  const { ws } = this
+
+  ws[kReadyState] = states.CLOSING
+
+  if (channels.socketError.hasSubscribers) {
+    channels.socketError.publish(error)
+  }
+
+  this.destroy()
+}
+
+module.exports = {
+  establishWebSocketConnection
+}

my-app/node_modules/undici/lib/websocket/constants.js

@@ -0,0 +1,51 @@
+'use strict'
+
+// This is a Globally Unique Identifier unique used
+// to validate that the endpoint accepts websocket
+// connections.
+// See https://www.rfc-editor.org/rfc/rfc6455.html#section-1.3
+const uid = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
+
+/** @type {PropertyDescriptor} */
+const staticPropertyDescriptors = {
+  enumerable: true,
+  writable: false,
+  configurable: false
+}
+
+const states = {
+  CONNECTING: 0,
+  OPEN: 1,
+  CLOSING: 2,
+  CLOSED: 3
+}
+
+const opcodes = {
+  CONTINUATION: 0x0,
+  TEXT: 0x1,
+  BINARY: 0x2,
+  CLOSE: 0x8,
+  PING: 0x9,
+  PONG: 0xA
+}
+
+const maxUnsigned16Bit = 2 ** 16 - 1 // 65535
+
+const parserStates = {
+  INFO: 0,
+  PAYLOADLENGTH_16: 2,
+  PAYLOADLENGTH_64: 3,
+  READ_DATA: 4
+}
+
+const emptyBuffer = Buffer.allocUnsafe(0)
+
+module.exports = {
+  uid,
+  staticPropertyDescriptors,
+  states,
+  opcodes,
+  maxUnsigned16Bit,
+  parserStates,
+  emptyBuffer
+}

my-app/node_modules/undici/lib/websocket/events.js

@@ -0,0 +1,303 @@
+'use strict'
+
+const { webidl } = require('../fetch/webidl')
+const { kEnumerableProperty } = require('../core/util')
+const { MessagePort } = require('worker_threads')
+
+/**
+ * @see https://html.spec.whatwg.org/multipage/comms.html#messageevent
+ */
+class MessageEvent extends Event {
+  #eventInit
+
+  constructor (type, eventInitDict = {}) {
+    webidl.argumentLengthCheck(arguments, 1, { header: 'MessageEvent constructor' })
+
+    type = webidl.converters.DOMString(type)
+    eventInitDict = webidl.converters.MessageEventInit(eventInitDict)
+
+    super(type, eventInitDict)
+
+    this.#eventInit = eventInitDict
+  }
+
+  get data () {
+    webidl.brandCheck(this, MessageEvent)
+
+    return this.#eventInit.data
+  }
+
+  get origin () {
+    webidl.brandCheck(this, MessageEvent)
+
+    return this.#eventInit.origin
+  }
+
+  get lastEventId () {
+    webidl.brandCheck(this, MessageEvent)
+
+    return this.#eventInit.lastEventId
+  }
+
+  get source () {
+    webidl.brandCheck(this, MessageEvent)
+
+    return this.#eventInit.source
+  }
+
+  get ports () {
+    webidl.brandCheck(this, MessageEvent)
+
+    if (!Object.isFrozen(this.#eventInit.ports)) {
+      Object.freeze(this.#eventInit.ports)
+    }
+
+    return this.#eventInit.ports
+  }
+
+  initMessageEvent (
+    type,
+    bubbles = false,
+    cancelable = false,
+    data = null,
+    origin = '',
+    lastEventId = '',
+    source = null,
+    ports = []
+  ) {
+    webidl.brandCheck(this, MessageEvent)
+
+    webidl.argumentLengthCheck(arguments, 1, { header: 'MessageEvent.initMessageEvent' })
+
+    return new MessageEvent(type, {
+      bubbles, cancelable, data, origin, lastEventId, source, ports
+    })
+  }
+}
+
+/**
+ * @see https://websockets.spec.whatwg.org/#the-closeevent-interface
+ */
+class CloseEvent extends Event {
+  #eventInit
+
+  constructor (type, eventInitDict = {}) {
+    webidl.argumentLengthCheck(arguments, 1, { header: 'CloseEvent constructor' })
+
+    type = webidl.converters.DOMString(type)
+    eventInitDict = webidl.converters.CloseEventInit(eventInitDict)
+
+    super(type, eventInitDict)
+
+    this.#eventInit = eventInitDict
+  }
+
+  get wasClean () {
+    webidl.brandCheck(this, CloseEvent)
+
+    return this.#eventInit.wasClean
+  }
+
+  get code () {
+    webidl.brandCheck(this, CloseEvent)
+
+    return this.#eventInit.code
+  }
+
+  get reason () {
+    webidl.brandCheck(this, CloseEvent)
+
+    return this.#eventInit.reason
+  }
+}
+
+// https://html.spec.whatwg.org/multipage/webappapis.html#the-errorevent-interface
+class ErrorEvent extends Event {
+  #eventInit
+
+  constructor (type, eventInitDict) {
+    webidl.argumentLengthCheck(arguments, 1, { header: 'ErrorEvent constructor' })
+
+    super(type, eventInitDict)
+
+    type = webidl.converters.DOMString(type)
+    eventInitDict = webidl.converters.ErrorEventInit(eventInitDict ?? {})
+
+    this.#eventInit = eventInitDict
+  }
+
+  get message () {
+    webidl.brandCheck(this, ErrorEvent)
+
+    return this.#eventInit.message
+  }
+
+  get filename () {
+    webidl.brandCheck(this, ErrorEvent)
+
+    return this.#eventInit.filename
+  }
+
+  get lineno () {
+    webidl.brandCheck(this, ErrorEvent)
+
+    return this.#eventInit.lineno
+  }
+
+  get colno () {
+    webidl.brandCheck(this, ErrorEvent)
+
+    return this.#eventInit.colno
+  }
+
+  get error () {
+    webidl.brandCheck(this, ErrorEvent)
+
+    return this.#eventInit.error
+  }
+}
+
+Object.defineProperties(MessageEvent.prototype, {
+  [Symbol.toStringTag]: {
+    value: 'MessageEvent',
+    configurable: true
+  },
+  data: kEnumerableProperty,
+  origin: kEnumerableProperty,
+  lastEventId: kEnumerableProperty,
+  source: kEnumerableProperty,
+  ports: kEnumerableProperty,
+  initMessageEvent: kEnumerableProperty
+})
+
+Object.defineProperties(CloseEvent.prototype, {
+  [Symbol.toStringTag]: {
+    value: 'CloseEvent',
+    configurable: true
+  },
+  reason: kEnumerableProperty,
+  code: kEnumerableProperty,
+  wasClean: kEnumerableProperty
+})
+
+Object.defineProperties(ErrorEvent.prototype, {
+  [Symbol.toStringTag]: {
+    value: 'ErrorEvent',
+    configurable: true
+  },
+  message: kEnumerableProperty,
+  filename: kEnumerableProperty,
+  lineno: kEnumerableProperty,
+  colno: kEnumerableProperty,
+  error: kEnumerableProperty
+})
+
+webidl.converters.MessagePort = webidl.interfaceConverter(MessagePort)
+
+webidl.converters['sequence<MessagePort>'] = webidl.sequenceConverter(
+  webidl.converters.MessagePort
+)
+
+const eventInit = [
+  {
+    key: 'bubbles',
+    converter: webidl.converters.boolean,
+    defaultValue: false
+  },
+  {
+    key: 'cancelable',
+    converter: webidl.converters.boolean,
+    defaultValue: false
+  },
+  {
+    key: 'composed',
+    converter: webidl.converters.boolean,
+    defaultValue: false
+  }
+]
+
+webidl.converters.MessageEventInit = webidl.dictionaryConverter([
+  ...eventInit,
+  {
+    key: 'data',
+    converter: webidl.converters.any,
+    defaultValue: null
+  },
+  {
+    key: 'origin',
+    converter: webidl.converters.USVString,
+    defaultValue: ''
+  },
+  {
+    key: 'lastEventId',
+    converter: webidl.converters.DOMString,
+    defaultValue: ''
+  },
+  {
+    key: 'source',
+    // Node doesn't implement WindowProxy or ServiceWorker, so the only
+    // valid value for source is a MessagePort.
+    converter: webidl.nullableConverter(webidl.converters.MessagePort),
+    defaultValue: null
+  },
+  {
+    key: 'ports',
+    converter: webidl.converters['sequence<MessagePort>'],
+    get defaultValue () {
+      return []
+    }
+  }
+])
+
+webidl.converters.CloseEventInit = webidl.dictionaryConverter([
+  ...eventInit,
+  {
+    key: 'wasClean',
+    converter: webidl.converters.boolean,
+    defaultValue: false
+  },
+  {
+    key: 'code',
+    converter: webidl.converters['unsigned short'],
+    defaultValue: 0
+  },
+  {
+    key: 'reason',
+    converter: webidl.converters.USVString,
+    defaultValue: ''
+  }
+])
+
+webidl.converters.ErrorEventInit = webidl.dictionaryConverter([
+  ...eventInit,
+  {
+    key: 'message',
+    converter: webidl.converters.DOMString,
+    defaultValue: ''
+  },
+  {
+    key: 'filename',
+    converter: webidl.converters.USVString,
+    defaultValue: ''
+  },
+  {
+    key: 'lineno',
+    converter: webidl.converters['unsigned long'],
+    defaultValue: 0
+  },
+  {
+    key: 'colno',
+    converter: webidl.converters['unsigned long'],
+    defaultValue: 0
+  },
+  {
+    key: 'error',
+    converter: webidl.converters.any
+  }
+])
+
+module.exports = {
+  MessageEvent,
+  CloseEvent,
+  ErrorEvent
+}

my-app/node_modules/undici/lib/websocket/frame.js

@@ -0,0 +1,73 @@
+'use strict'
+
+const { maxUnsigned16Bit } = require('./constants')
+
+/** @type {import('crypto')} */
+let crypto
+try {
+  crypto = require('crypto')
+} catch {
+
+}
+
+class WebsocketFrameSend {
+  /**
+   * @param {Buffer|undefined} data
+   */
+  constructor (data) {
+    this.frameData = data
+    this.maskKey = crypto.randomBytes(4)
+  }
+
+  createFrame (opcode) {
+    const bodyLength = this.frameData?.byteLength ?? 0
+
+    /** @type {number} */
+    let payloadLength = bodyLength // 0-125
+    let offset = 6
+
+    if (bodyLength > maxUnsigned16Bit) {
+      offset += 8 // payload length is next 8 bytes
+      payloadLength = 127
+    } else if (bodyLength > 125) {
+      offset += 2 // payload length is next 2 bytes
+      payloadLength = 126
+    }
+
+    const buffer = Buffer.allocUnsafe(bodyLength + offset)
+
+    // Clear first 2 bytes, everything else is overwritten
+    buffer[0] = buffer[1] = 0
+    buffer[0] |= 0x80 // FIN
+    buffer[0] = (buffer[0] & 0xF0) + opcode // opcode
+
+    /*! ws. MIT License. Einar Otto Stangvik <einaros@gmail.com> */
+    buffer[offset - 4] = this.maskKey[0]
+    buffer[offset - 3] = this.maskKey[1]
+    buffer[offset - 2] = this.maskKey[2]
+    buffer[offset - 1] = this.maskKey[3]
+
+    buffer[1] = payloadLength
+
+    if (payloadLength === 126) {
+      buffer.writeUInt16BE(bodyLength, 2)
+    } else if (payloadLength === 127) {
+      // Clear extended payload length
+      buffer[2] = buffer[3] = 0
+      buffer.writeUIntBE(bodyLength, 4, 6)
+    }
+
+    buffer[1] |= 0x80 // MASK
+
+    // mask body
+    for (let i = 0; i < bodyLength; i++) {
+      buffer[offset + i] = this.frameData[i] ^ this.maskKey[i % 4]
+    }
+
+    return buffer
+  }
+}
+
+module.exports = {
+  WebsocketFrameSend
+}

my-app/node_modules/undici/lib/websocket/receiver.js

@@ -0,0 +1,344 @@
+'use strict'
+
+const { Writable } = require('stream')
+const diagnosticsChannel = require('diagnostics_channel')
+const { parserStates, opcodes, states, emptyBuffer } = require('./constants')
+const { kReadyState, kSentClose, kResponse, kReceivedClose } = require('./symbols')
+const { isValidStatusCode, failWebsocketConnection, websocketMessageReceived } = require('./util')
+const { WebsocketFrameSend } = require('./frame')
+
+// This code was influenced by ws released under the MIT license.
+// Copyright (c) 2011 Einar Otto Stangvik <einaros@gmail.com>
+// Copyright (c) 2013 Arnout Kazemier and contributors
+// Copyright (c) 2016 Luigi Pinca and contributors
+
+const channels = {}
+channels.ping = diagnosticsChannel.channel('undici:websocket:ping')
+channels.pong = diagnosticsChannel.channel('undici:websocket:pong')
+
+class ByteParser extends Writable {
+  #buffers = []
+  #byteOffset = 0
+
+  #state = parserStates.INFO
+
+  #info = {}
+  #fragments = []
+
+  constructor (ws) {
+    super()
+
+    this.ws = ws
+  }
+
+  /**
+   * @param {Buffer} chunk
+   * @param {() => void} callback
+   */
+  _write (chunk, _, callback) {
+    this.#buffers.push(chunk)
+    this.#byteOffset += chunk.length
+
+    this.run(callback)
+  }
+
+  /**
+   * Runs whenever a new chunk is received.
+   * Callback is called whenever there are no more chunks buffering,
+   * or not enough bytes are buffered to parse.
+   */
+  run (callback) {
+    while (true) {
+      if (this.#state === parserStates.INFO) {
+        // If there aren't enough bytes to parse the payload length, etc.
+        if (this.#byteOffset < 2) {
+          return callback()
+        }
+
+        const buffer = this.consume(2)
+
+        this.#info.fin = (buffer[0] & 0x80) !== 0
+        this.#info.opcode = buffer[0] & 0x0F
+
+        // If we receive a fragmented message, we use the type of the first
+        // frame to parse the full message as binary/text, when it's terminated
+        this.#info.originalOpcode ??= this.#info.opcode
+
+        this.#info.fragmented = !this.#info.fin && this.#info.opcode !== opcodes.CONTINUATION
+
+        if (this.#info.fragmented && this.#info.opcode !== opcodes.BINARY && this.#info.opcode !== opcodes.TEXT) {
+          // Only text and binary frames can be fragmented
+          failWebsocketConnection(this.ws, 'Invalid frame type was fragmented.')
+          return
+        }
+
+        const payloadLength = buffer[1] & 0x7F
+
+        if (payloadLength <= 125) {
+          this.#info.payloadLength = payloadLength
+          this.#state = parserStates.READ_DATA
+        } else if (payloadLength === 126) {
+          this.#state = parserStates.PAYLOADLENGTH_16
+        } else if (payloadLength === 127) {
+          this.#state = parserStates.PAYLOADLENGTH_64
+        }
+
+        if (this.#info.fragmented && payloadLength > 125) {
+          // A fragmented frame can't be fragmented itself
+          failWebsocketConnection(this.ws, 'Fragmented frame exceeded 125 bytes.')
+          return
+        } else if (
+          (this.#info.opcode === opcodes.PING ||
+            this.#info.opcode === opcodes.PONG ||
+            this.#info.opcode === opcodes.CLOSE) &&
+          payloadLength > 125
+        ) {
+          // Control frames can have a payload length of 125 bytes MAX
+          failWebsocketConnection(this.ws, 'Payload length for control frame exceeded 125 bytes.')
+          return
+        } else if (this.#info.opcode === opcodes.CLOSE) {
+          if (payloadLength === 1) {
+            failWebsocketConnection(this.ws, 'Received close frame with a 1-byte body.')
+            return
+          }
+
+          const body = this.consume(payloadLength)
+
+          this.#info.closeInfo = this.parseCloseBody(false, body)
+
+          if (!this.ws[kSentClose]) {
+            // If an endpoint receives a Close frame and did not previously send a
+            // Close frame, the endpoint MUST send a Close frame in response.  (When
+            // sending a Close frame in response, the endpoint typically echos the
+            // status code it received.)
+            const body = Buffer.allocUnsafe(2)
+            body.writeUInt16BE(this.#info.closeInfo.code, 0)
+            const closeFrame = new WebsocketFrameSend(body)
+
+            this.ws[kResponse].socket.write(
+              closeFrame.createFrame(opcodes.CLOSE),
+              (err) => {
+                if (!err) {
+                  this.ws[kSentClose] = true
+                }
+              }
+            )
+          }
+
+          // Upon either sending or receiving a Close control frame, it is said
+          // that _The WebSocket Closing Handshake is Started_ and that the
+          // WebSocket connection is in the CLOSING state.
+          this.ws[kReadyState] = states.CLOSING
+          this.ws[kReceivedClose] = true
+
+          this.end()
+
+          return
+        } else if (this.#info.opcode === opcodes.PING) {
+          // Upon receipt of a Ping frame, an endpoint MUST send a Pong frame in
+          // response, unless it already received a Close frame.
+          // A Pong frame sent in response to a Ping frame must have identical
+          // "Application data"
+
+          const body = this.consume(payloadLength)
+
+          if (!this.ws[kReceivedClose]) {
+            const frame = new WebsocketFrameSend(body)
+
+            this.ws[kResponse].socket.write(frame.createFrame(opcodes.PONG))
+
+            if (channels.ping.hasSubscribers) {
+              channels.ping.publish({
+                payload: body
+              })
+            }
+          }
+
+          this.#state = parserStates.INFO
+
+          if (this.#byteOffset > 0) {
+            continue
+          } else {
+            callback()
+            return
+          }
+        } else if (this.#info.opcode === opcodes.PONG) {
+          // A Pong frame MAY be sent unsolicited.  This serves as a
+          // unidirectional heartbeat.  A response to an unsolicited Pong frame is
+          // not expected.
+
+          const body = this.consume(payloadLength)
+
+          if (channels.pong.hasSubscribers) {
+            channels.pong.publish({
+              payload: body
+            })
+          }
+
+          if (this.#byteOffset > 0) {
+            continue
+          } else {
+            callback()
+            return
+          }
+        }
+      } else if (this.#state === parserStates.PAYLOADLENGTH_16) {
+        if (this.#byteOffset < 2) {
+          return callback()
+        }
+
+        const buffer = this.consume(2)
+
+        this.#info.payloadLength = buffer.readUInt16BE(0)
+        this.#state = parserStates.READ_DATA
+      } else if (this.#state === parserStates.PAYLOADLENGTH_64) {
+        if (this.#byteOffset < 8) {
+          return callback()
+        }
+
+        const buffer = this.consume(8)
+        const upper = buffer.readUInt32BE(0)
+
+        // 2^31 is the maxinimum bytes an arraybuffer can contain
+        // on 32-bit systems. Although, on 64-bit systems, this is
+        // 2^53-1 bytes.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Invalid_array_length
+        // https://source.chromium.org/chromium/chromium/src/+/main:v8/src/common/globals.h;drc=1946212ac0100668f14eb9e2843bdd846e510a1e;bpv=1;bpt=1;l=1275
+        // https://source.chromium.org/chromium/chromium/src/+/main:v8/src/objects/js-array-buffer.h;l=34;drc=1946212ac0100668f14eb9e2843bdd846e510a1e
+        if (upper > 2 ** 31 - 1) {
+          failWebsocketConnection(this.ws, 'Received payload length > 2^31 bytes.')
+          return
+        }
+
+        const lower = buffer.readUInt32BE(4)
+
+        this.#info.payloadLength = (upper << 8) + lower
+        this.#state = parserStates.READ_DATA
+      } else if (this.#state === parserStates.READ_DATA) {
+        if (this.#byteOffset < this.#info.payloadLength) {
+          // If there is still more data in this chunk that needs to be read
+          return callback()
+        } else if (this.#byteOffset >= this.#info.payloadLength) {
+          // If the server sent multiple frames in a single chunk
+
+          const body = this.consume(this.#info.payloadLength)
+
+          this.#fragments.push(body)
+
+          // If the frame is unfragmented, or a fragmented frame was terminated,
+          // a message was received
+          if (!this.#info.fragmented || (this.#info.fin && this.#info.opcode === opcodes.CONTINUATION)) {
+            const fullMessage = Buffer.concat(this.#fragments)
+
+            websocketMessageReceived(this.ws, this.#info.originalOpcode, fullMessage)
+
+            this.#info = {}
+            this.#fragments.length = 0
+          }
+
+          this.#state = parserStates.INFO
+        }
+      }
+
+      if (this.#byteOffset > 0) {
+        continue
+      } else {
+        callback()
+        break
+      }
+    }
+  }
+
+  /**
+   * Take n bytes from the buffered Buffers
+   * @param {number} n
+   * @returns {Buffer|null}
+   */
+  consume (n) {
+    if (n > this.#byteOffset) {
+      return null
+    } else if (n === 0) {
+      return emptyBuffer
+    }
+
+    if (this.#buffers[0].length === n) {
+      this.#byteOffset -= this.#buffers[0].length
+      return this.#buffers.shift()
+    }
+
+    const buffer = Buffer.allocUnsafe(n)
+    let offset = 0
+
+    while (offset !== n) {
+      const next = this.#buffers[0]
+      const { length } = next
+
+      if (length + offset === n) {
+        buffer.set(this.#buffers.shift(), offset)
+        break
+      } else if (length + offset > n) {
+        buffer.set(next.subarray(0, n - offset), offset)
+        this.#buffers[0] = next.subarray(n - offset)
+        break
+      } else {
+        buffer.set(this.#buffers.shift(), offset)
+        offset += next.length
+      }
+    }
+
+    this.#byteOffset -= n
+
+    return buffer
+  }
+
+  parseCloseBody (onlyCode, data) {
+    // https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.5
+    /** @type {number|undefined} */
+    let code
+
+    if (data.length >= 2) {
+      // _The WebSocket Connection Close Code_ is
+      // defined as the status code (Section 7.4) contained in the first Close
+      // control frame received by the application
+      code = data.readUInt16BE(0)
+    }
+
+    if (onlyCode) {
+      if (!isValidStatusCode(code)) {
+        return null
+      }
+
+      return { code }
+    }
+
+    // https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.6
+    /** @type {Buffer} */
+    let reason = data.subarray(2)
+
+    // Remove BOM
+    if (reason[0] === 0xEF && reason[1] === 0xBB && reason[2] === 0xBF) {
+      reason = reason.subarray(3)
+    }
+
+    if (code !== undefined && !isValidStatusCode(code)) {
+      return null
+    }
+
+    try {
+      // TODO: optimize this
+      reason = new TextDecoder('utf-8', { fatal: true }).decode(reason)
+    } catch {
+      return null
+    }
+
+    return { code, reason }
+  }
+
+  get closingInfo () {
+    return this.#info.closeInfo
+  }
+}
+
+module.exports = {
+  ByteParser
+}

my-app/node_modules/undici/lib/websocket/symbols.js

@@ -0,0 +1,12 @@
+'use strict'
+
+module.exports = {
+  kWebSocketURL: Symbol('url'),
+  kReadyState: Symbol('ready state'),
+  kController: Symbol('controller'),
+  kResponse: Symbol('response'),
+  kBinaryType: Symbol('binary type'),
+  kSentClose: Symbol('sent close'),
+  kReceivedClose: Symbol('received close'),
+  kByteParser: Symbol('byte parser')
+}

my-app/node_modules/undici/lib/websocket/util.js

@@ -0,0 +1,201 @@
+'use strict'
+
+const { kReadyState, kController, kResponse, kBinaryType, kWebSocketURL } = require('./symbols')
+const { states, opcodes } = require('./constants')
+const { MessageEvent, ErrorEvent } = require('./events')
+
+/* globals Blob */
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ */
+function isEstablished (ws) {
+  // If the server's response is validated as provided for above, it is
+  // said that _The WebSocket Connection is Established_ and that the
+  // WebSocket Connection is in the OPEN state.
+  return ws[kReadyState] === states.OPEN
+}
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ */
+function isClosing (ws) {
+  // Upon either sending or receiving a Close control frame, it is said
+  // that _The WebSocket Closing Handshake is Started_ and that the
+  // WebSocket connection is in the CLOSING state.
+  return ws[kReadyState] === states.CLOSING
+}
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ */
+function isClosed (ws) {
+  return ws[kReadyState] === states.CLOSED
+}
+
+/**
+ * @see https://dom.spec.whatwg.org/#concept-event-fire
+ * @param {string} e
+ * @param {EventTarget} target
+ * @param {EventInit | undefined} eventInitDict
+ */
+function fireEvent (e, target, eventConstructor = Event, eventInitDict) {
+  // 1. If eventConstructor is not given, then let eventConstructor be Event.
+
+  // 2. Let event be the result of creating an event given eventConstructor,
+  //    in the relevant realm of target.
+  // 3. Initialize event’s type attribute to e.
+  const event = new eventConstructor(e, eventInitDict) // eslint-disable-line new-cap
+
+  // 4. Initialize any other IDL attributes of event as described in the
+  //    invocation of this algorithm.
+
+  // 5. Return the result of dispatching event at target, with legacy target
+  //    override flag set if set.
+  target.dispatchEvent(event)
+}
+
+/**
+ * @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol
+ * @param {import('./websocket').WebSocket} ws
+ * @param {number} type Opcode
+ * @param {Buffer} data application data
+ */
+function websocketMessageReceived (ws, type, data) {
+  // 1. If ready state is not OPEN (1), then return.
+  if (ws[kReadyState] !== states.OPEN) {
+    return
+  }
+
+  // 2. Let dataForEvent be determined by switching on type and binary type:
+  let dataForEvent
+
+  if (type === opcodes.TEXT) {
+    // -> type indicates that the data is Text
+    //      a new DOMString containing data
+    try {
+      dataForEvent = new TextDecoder('utf-8', { fatal: true }).decode(data)
+    } catch {
+      failWebsocketConnection(ws, 'Received invalid UTF-8 in text frame.')
+      return
+    }
+  } else if (type === opcodes.BINARY) {
+    if (ws[kBinaryType] === 'blob') {
+      // -> type indicates that the data is Binary and binary type is "blob"
+      //      a new Blob object, created in the relevant Realm of the WebSocket
+      //      object, that represents data as its raw data
+      dataForEvent = new Blob([data])
+    } else {
+      // -> type indicates that the data is Binary and binary type is "arraybuffer"
+      //      a new ArrayBuffer object, created in the relevant Realm of the
+      //      WebSocket object, whose contents are data
+      dataForEvent = new Uint8Array(data).buffer
+    }
+  }
+
+  // 3. Fire an event named message at the WebSocket object, using MessageEvent,
+  //    with the origin attribute initialized to the serialization of the WebSocket
+  //    object’s url's origin, and the data attribute initialized to dataForEvent.
+  fireEvent('message', ws, MessageEvent, {
+    origin: ws[kWebSocketURL].origin,
+    data: dataForEvent
+  })
+}
+
+/**
+ * @see https://datatracker.ietf.org/doc/html/rfc6455
+ * @see https://datatracker.ietf.org/doc/html/rfc2616
+ * @see https://bugs.chromium.org/p/chromium/issues/detail?id=398407
+ * @param {string} protocol
+ */
+function isValidSubprotocol (protocol) {
+  // If present, this value indicates one
+  // or more comma-separated subprotocol the client wishes to speak,
+  // ordered by preference.  The elements that comprise this value
+  // MUST be non-empty strings with characters in the range U+0021 to
+  // U+007E not including separator characters as defined in
+  // [RFC2616] and MUST all be unique strings.
+  if (protocol.length === 0) {
+    return false
+  }
+
+  for (const char of protocol) {
+    const code = char.charCodeAt(0)
+
+    if (
+      code < 0x21 ||
+      code > 0x7E ||
+      char === '(' ||
+      char === ')' ||
+      char === '<' ||
+      char === '>' ||
+      char === '@' ||
+      char === ',' ||
+      char === ';' ||
+      char === ':' ||
+      char === '\\' ||
+      char === '"' ||
+      char === '/' ||
+      char === '[' ||
+      char === ']' ||
+      char === '?' ||
+      char === '=' ||
+      char === '{' ||
+      char === '}' ||
+      code === 32 || // SP
+      code === 9 // HT
+    ) {
+      return false
+    }
+  }
+
+  return true
+}
+
+/**
+ * @see https://datatracker.ietf.org/doc/html/rfc6455#section-7-4
+ * @param {number} code
+ */
+function isValidStatusCode (code) {
+  if (code >= 1000 && code < 1015) {
+    return (
+      code !== 1004 && // reserved
+      code !== 1005 && // "MUST NOT be set as a status code"
+      code !== 1006 // "MUST NOT be set as a status code"
+    )
+  }
+
+  return code >= 3000 && code <= 4999
+}
+
+/**
+ * @param {import('./websocket').WebSocket} ws
+ * @param {string|undefined} reason
+ */
+function failWebsocketConnection (ws, reason) {
+  const { [kController]: controller, [kResponse]: response } = ws
+
+  controller.abort()
+
+  if (response?.socket && !response.socket.destroyed) {
+    response.socket.destroy()
+  }
+
+  if (reason) {
+    // TODO: process.nextTick
+    fireEvent('error', ws, ErrorEvent, {
+      error: new Error(reason)
+    })
+  }
+}
+
+module.exports = {
+  isEstablished,
+  isClosing,
+  isClosed,
+  fireEvent,
+  isValidSubprotocol,
+  isValidStatusCode,
+  failWebsocketConnection,
+  websocketMessageReceived
+}

my-app/node_modules/undici/lib/websocket/websocket.js

@@ -0,0 +1,640 @@
+'use strict'
+
+const { webidl } = require('../fetch/webidl')
+const { URLSerializer } = require('../fetch/dataURL')
+const { getGlobalOrigin } = require('../fetch/global')
+const { staticPropertyDescriptors, states, opcodes, emptyBuffer } = require('./constants')
+const {
+  kWebSocketURL,
+  kReadyState,
+  kController,
+  kBinaryType,
+  kResponse,
+  kSentClose,
+  kByteParser
+} = require('./symbols')
+const { isEstablished, isClosing, isValidSubprotocol, failWebsocketConnection, fireEvent } = require('./util')
+const { establishWebSocketConnection } = require('./connection')
+const { WebsocketFrameSend } = require('./frame')
+const { ByteParser } = require('./receiver')
+const { kEnumerableProperty, isBlobLike } = require('../core/util')
+const { getGlobalDispatcher } = require('../global')
+const { types } = require('util')
+
+let experimentalWarned = false
+
+// https://websockets.spec.whatwg.org/#interface-definition
+class WebSocket extends EventTarget {
+  #events = {
+    open: null,
+    error: null,
+    close: null,
+    message: null
+  }
+
+  #bufferedAmount = 0
+  #protocol = ''
+  #extensions = ''
+
+  /**
+   * @param {string} url
+   * @param {string|string[]} protocols
+   */
+  constructor (url, protocols = []) {
+    super()
+
+    webidl.argumentLengthCheck(arguments, 1, { header: 'WebSocket constructor' })
+
+    if (!experimentalWarned) {
+      experimentalWarned = true
+      process.emitWarning('WebSockets are experimental, expect them to change at any time.', {
+        code: 'UNDICI-WS'
+      })
+    }
+
+    const options = webidl.converters['DOMString or sequence<DOMString> or WebSocketInit'](protocols)
+
+    url = webidl.converters.USVString(url)
+    protocols = options.protocols
+
+    // 1. Let baseURL be this's relevant settings object's API base URL.
+    const baseURL = getGlobalOrigin()
+
+    // 1. Let urlRecord be the result of applying the URL parser to url with baseURL.
+    let urlRecord
+
+    try {
+      urlRecord = new URL(url, baseURL)
+    } catch (e) {
+      // 3. If urlRecord is failure, then throw a "SyntaxError" DOMException.
+      throw new DOMException(e, 'SyntaxError')
+    }
+
+    // 4. If urlRecord’s scheme is "http", then set urlRecord’s scheme to "ws".
+    if (urlRecord.protocol === 'http:') {
+      urlRecord.protocol = 'ws:'
+    } else if (urlRecord.protocol === 'https:') {
+      // 5. Otherwise, if urlRecord’s scheme is "https", set urlRecord’s scheme to "wss".
+      urlRecord.protocol = 'wss:'
+    }
+
+    // 6. If urlRecord’s scheme is not "ws" or "wss", then throw a "SyntaxError" DOMException.
+    if (urlRecord.protocol !== 'ws:' && urlRecord.protocol !== 'wss:') {
+      throw new DOMException(
+        `Expected a ws: or wss: protocol, got ${urlRecord.protocol}`,
+        'SyntaxError'
+      )
+    }
+
+    // 7. If urlRecord’s fragment is non-null, then throw a "SyntaxError"
+    //    DOMException.
+    if (urlRecord.hash || urlRecord.href.endsWith('#')) {
+      throw new DOMException('Got fragment', 'SyntaxError')
+    }
+
+    // 8. If protocols is a string, set protocols to a sequence consisting
+    //    of just that string.
+    if (typeof protocols === 'string') {
+      protocols = [protocols]
+    }
+
+    // 9. If any of the values in protocols occur more than once or otherwise
+    //    fail to match the requirements for elements that comprise the value
+    //    of `Sec-WebSocket-Protocol` fields as defined by The WebSocket
+    //    protocol, then throw a "SyntaxError" DOMException.
+    if (protocols.length !== new Set(protocols.map(p => p.toLowerCase())).size) {
+      throw new DOMException('Invalid Sec-WebSocket-Protocol value', 'SyntaxError')
+    }
+
+    if (protocols.length > 0 && !protocols.every(p => isValidSubprotocol(p))) {
+      throw new DOMException('Invalid Sec-WebSocket-Protocol value', 'SyntaxError')
+    }
+
+    // 10. Set this's url to urlRecord.
+    this[kWebSocketURL] = new URL(urlRecord.href)
+
+    // 11. Let client be this's relevant settings object.
+
+    // 12. Run this step in parallel:
+
+    //    1. Establish a WebSocket connection given urlRecord, protocols,
+    //       and client.
+    this[kController] = establishWebSocketConnection(
+      urlRecord,
+      protocols,
+      this,
+      (response) => this.#onConnectionEstablished(response),
+      options
+    )
+
+    // Each WebSocket object has an associated ready state, which is a
+    // number representing the state of the connection. Initially it must
+    // be CONNECTING (0).
+    this[kReadyState] = WebSocket.CONNECTING
+
+    // The extensions attribute must initially return the empty string.
+
+    // The protocol attribute must initially return the empty string.
+
+    // Each WebSocket object has an associated binary type, which is a
+    // BinaryType. Initially it must be "blob".
+    this[kBinaryType] = 'blob'
+  }
+
+  /**
+   * @see https://websockets.spec.whatwg.org/#dom-websocket-close
+   * @param {number|undefined} code
+   * @param {string|undefined} reason
+   */
+  close (code = undefined, reason = undefined) {
+    webidl.brandCheck(this, WebSocket)
+
+    if (code !== undefined) {
+      code = webidl.converters['unsigned short'](code, { clamp: true })
+    }
+
+    if (reason !== undefined) {
+      reason = webidl.converters.USVString(reason)
+    }
+
+    // 1. If code is present, but is neither an integer equal to 1000 nor an
+    //    integer in the range 3000 to 4999, inclusive, throw an
+    //    "InvalidAccessError" DOMException.
+    if (code !== undefined) {
+      if (code !== 1000 && (code < 3000 || code > 4999)) {
+        throw new DOMException('invalid code', 'InvalidAccessError')
+      }
+    }
+
+    let reasonByteLength = 0
+
+    // 2. If reason is present, then run these substeps:
+    if (reason !== undefined) {
+      // 1. Let reasonBytes be the result of encoding reason.
+      // 2. If reasonBytes is longer than 123 bytes, then throw a
+      //    "SyntaxError" DOMException.
+      reasonByteLength = Buffer.byteLength(reason)
+
+      if (reasonByteLength > 123) {
+        throw new DOMException(
+          `Reason must be less than 123 bytes; received ${reasonByteLength}`,
+          'SyntaxError'
+        )
+      }
+    }
+
+    // 3. Run the first matching steps from the following list:
+    if (this[kReadyState] === WebSocket.CLOSING || this[kReadyState] === WebSocket.CLOSED) {
+      // If this's ready state is CLOSING (2) or CLOSED (3)
+      // Do nothing.
+    } else if (!isEstablished(this)) {
+      // If the WebSocket connection is not yet established
+      // Fail the WebSocket connection and set this's ready state
+      // to CLOSING (2).
+      failWebsocketConnection(this, 'Connection was closed before it was established.')
+      this[kReadyState] = WebSocket.CLOSING
+    } else if (!isClosing(this)) {
+      // If the WebSocket closing handshake has not yet been started
+      // Start the WebSocket closing handshake and set this's ready
+      // state to CLOSING (2).
+      // - If neither code nor reason is present, the WebSocket Close
+      //   message must not have a body.
+      // - If code is present, then the status code to use in the
+      //   WebSocket Close message must be the integer given by code.
+      // - If reason is also present, then reasonBytes must be
+      //   provided in the Close message after the status code.
+
+      const frame = new WebsocketFrameSend()
+
+      // If neither code nor reason is present, the WebSocket Close
+      // message must not have a body.
+
+      // If code is present, then the status code to use in the
+      // WebSocket Close message must be the integer given by code.
+      if (code !== undefined && reason === undefined) {
+        frame.frameData = Buffer.allocUnsafe(2)
+        frame.frameData.writeUInt16BE(code, 0)
+      } else if (code !== undefined && reason !== undefined) {
+        // If reason is also present, then reasonBytes must be
+        // provided in the Close message after the status code.
+        frame.frameData = Buffer.allocUnsafe(2 + reasonByteLength)
+        frame.frameData.writeUInt16BE(code, 0)
+        // the body MAY contain UTF-8-encoded data with value /reason/
+        frame.frameData.write(reason, 2, 'utf-8')
+      } else {
+        frame.frameData = emptyBuffer
+      }
+
+      /** @type {import('stream').Duplex} */
+      const socket = this[kResponse].socket
+
+      socket.write(frame.createFrame(opcodes.CLOSE), (err) => {
+        if (!err) {
+          this[kSentClose] = true
+        }
+      })
+
+      // Upon either sending or receiving a Close control frame, it is said
+      // that _The WebSocket Closing Handshake is Started_ and that the
+      // WebSocket connection is in the CLOSING state.
+      this[kReadyState] = states.CLOSING
+    } else {
+      // Otherwise
+      // Set this's ready state to CLOSING (2).
+      this[kReadyState] = WebSocket.CLOSING
+    }
+  }
+
+  /**
+   * @see https://websockets.spec.whatwg.org/#dom-websocket-send
+   * @param {NodeJS.TypedArray|ArrayBuffer|Blob|string} data
+   */
+  send (data) {
+    webidl.brandCheck(this, WebSocket)
+
+    webidl.argumentLengthCheck(arguments, 1, { header: 'WebSocket.send' })
+
+    data = webidl.converters.WebSocketSendData(data)
+
+    // 1. If this's ready state is CONNECTING, then throw an
+    //    "InvalidStateError" DOMException.
+    if (this[kReadyState] === WebSocket.CONNECTING) {
+      throw new DOMException('Sent before connected.', 'InvalidStateError')
+    }
+
+    // 2. Run the appropriate set of steps from the following list:
+    // https://datatracker.ietf.org/doc/html/rfc6455#section-6.1
+    // https://datatracker.ietf.org/doc/html/rfc6455#section-5.2
+
+    if (!isEstablished(this) || isClosing(this)) {
+      return
+    }
+
+    /** @type {import('stream').Duplex} */
+    const socket = this[kResponse].socket
+
+    // If data is a string
+    if (typeof data === 'string') {
+      // If the WebSocket connection is established and the WebSocket
+      // closing handshake has not yet started, then the user agent
+      // must send a WebSocket Message comprised of the data argument
+      // using a text frame opcode; if the data cannot be sent, e.g.
+      // because it would need to be buffered but the buffer is full,
+      // the user agent must flag the WebSocket as full and then close
+      // the WebSocket connection. Any invocation of this method with a
+      // string argument that does not throw an exception must increase
+      // the bufferedAmount attribute by the number of bytes needed to
+      // express the argument as UTF-8.
+
+      const value = Buffer.from(data)
+      const frame = new WebsocketFrameSend(value)
+      const buffer = frame.createFrame(opcodes.TEXT)
+
+      this.#bufferedAmount += value.byteLength
+      socket.write(buffer, () => {
+        this.#bufferedAmount -= value.byteLength
+      })
+    } else if (types.isArrayBuffer(data)) {
+      // If the WebSocket connection is established, and the WebSocket
+      // closing handshake has not yet started, then the user agent must
+      // send a WebSocket Message comprised of data using a binary frame
+      // opcode; if the data cannot be sent, e.g. because it would need
+      // to be buffered but the buffer is full, the user agent must flag
+      // the WebSocket as full and then close the WebSocket connection.
+      // The data to be sent is the data stored in the buffer described
+      // by the ArrayBuffer object. Any invocation of this method with an
+      // ArrayBuffer argument that does not throw an exception must
+      // increase the bufferedAmount attribute by the length of the
+      // ArrayBuffer in bytes.
+
+      const value = Buffer.from(data)
+      const frame = new WebsocketFrameSend(value)
+      const buffer = frame.createFrame(opcodes.BINARY)
+
+      this.#bufferedAmount += value.byteLength
+      socket.write(buffer, () => {
+        this.#bufferedAmount -= value.byteLength
+      })
+    } else if (ArrayBuffer.isView(data)) {
+      // If the WebSocket connection is established, and the WebSocket
+      // closing handshake has not yet started, then the user agent must
+      // send a WebSocket Message comprised of data using a binary frame
+      // opcode; if the data cannot be sent, e.g. because it would need to
+      // be buffered but the buffer is full, the user agent must flag the
+      // WebSocket as full and then close the WebSocket connection. The
+      // data to be sent is the data stored in the section of the buffer
+      // described by the ArrayBuffer object that data references. Any
+      // invocation of this method with this kind of argument that does
+      // not throw an exception must increase the bufferedAmount attribute
+      // by the length of data’s buffer in bytes.
+
+      const ab = Buffer.from(data, data.byteOffset, data.byteLength)
+
+      const frame = new WebsocketFrameSend(ab)
+      const buffer = frame.createFrame(opcodes.BINARY)
+
+      this.#bufferedAmount += ab.byteLength
+      socket.write(buffer, () => {
+        this.#bufferedAmount -= ab.byteLength
+      })
+    } else if (isBlobLike(data)) {
+      // If the WebSocket connection is established, and the WebSocket
+      // closing handshake has not yet started, then the user agent must
+      // send a WebSocket Message comprised of data using a binary frame
+      // opcode; if the data cannot be sent, e.g. because it would need to
+      // be buffered but the buffer is full, the user agent must flag the
+      // WebSocket as full and then close the WebSocket connection. The data
+      // to be sent is the raw data represented by the Blob object. Any
+      // invocation of this method with a Blob argument that does not throw
+      // an exception must increase the bufferedAmount attribute by the size
+      // of the Blob object’s raw data, in bytes.
+
+      const frame = new WebsocketFrameSend()
+
+      data.arrayBuffer().then((ab) => {
+        const value = Buffer.from(ab)
+        frame.frameData = value
+        const buffer = frame.createFrame(opcodes.BINARY)
+
+        this.#bufferedAmount += value.byteLength
+        socket.write(buffer, () => {
+          this.#bufferedAmount -= value.byteLength
+        })
+      })
+    }
+  }
+
+  get readyState () {
+    webidl.brandCheck(this, WebSocket)
+
+    // The readyState getter steps are to return this's ready state.
+    return this[kReadyState]
+  }
+
+  get bufferedAmount () {
+    webidl.brandCheck(this, WebSocket)
+
+    return this.#bufferedAmount
+  }
+
+  get url () {
+    webidl.brandCheck(this, WebSocket)
+
+    // The url getter steps are to return this's url, serialized.
+    return URLSerializer(this[kWebSocketURL])
+  }
+
+  get extensions () {
+    webidl.brandCheck(this, WebSocket)
+
+    return this.#extensions
+  }
+
+  get protocol () {
+    webidl.brandCheck(this, WebSocket)
+
+    return this.#protocol
+  }
+
+  get onopen () {
+    webidl.brandCheck(this, WebSocket)
+
+    return this.#events.open
+  }
+
+  set onopen (fn) {
+    webidl.brandCheck(this, WebSocket)
+
+    if (this.#events.open) {
+      this.removeEventListener('open', this.#events.open)
+    }
+
+    if (typeof fn === 'function') {
+      this.#events.open = fn
+      this.addEventListener('open', fn)
+    } else {
+      this.#events.open = null
+    }
+  }
+
+  get onerror () {
+    webidl.brandCheck(this, WebSocket)
+
+    return this.#events.error
+  }
+
+  set onerror (fn) {
+    webidl.brandCheck(this, WebSocket)
+
+    if (this.#events.error) {
+      this.removeEventListener('error', this.#events.error)
+    }
+
+    if (typeof fn === 'function') {
+      this.#events.error = fn
+      this.addEventListener('error', fn)
+    } else {
+      this.#events.error = null
+    }
+  }
+
+  get onclose () {
+    webidl.brandCheck(this, WebSocket)
+
+    return this.#events.close
+  }
+
+  set onclose (fn) {
+    webidl.brandCheck(this, WebSocket)
+
+    if (this.#events.close) {
+      this.removeEventListener('close', this.#events.close)
+    }
+
+    if (typeof fn === 'function') {
+      this.#events.close = fn
+      this.addEventListener('close', fn)
+    } else {
+      this.#events.close = null
+    }
+  }
+
+  get onmessage () {
+    webidl.brandCheck(this, WebSocket)
+
+    return this.#events.message
+  }
+
+  set onmessage (fn) {
+    webidl.brandCheck(this, WebSocket)
+
+    if (this.#events.message) {
+      this.removeEventListener('message', this.#events.message)
+    }
+
+    if (typeof fn === 'function') {
+      this.#events.message = fn
+      this.addEventListener('message', fn)
+    } else {
+      this.#events.message = null
+    }
+  }
+
+  get binaryType () {
+    webidl.brandCheck(this, WebSocket)
+
+    return this[kBinaryType]
+  }
+
+  set binaryType (type) {
+    webidl.brandCheck(this, WebSocket)
+
+    if (type !== 'blob' && type !== 'arraybuffer') {
+      this[kBinaryType] = 'blob'
+    } else {
+      this[kBinaryType] = type
+    }
+  }
+
+  /**
+   * @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol
+   */
+  #onConnectionEstablished (response) {
+    // processResponse is called when the "response’s header list has been received and initialized."
+    // once this happens, the connection is open
+    this[kResponse] = response
+
+    const parser = new ByteParser(this)
+    parser.on('drain', function onParserDrain () {
+      this.ws[kResponse].socket.resume()
+    })
+
+    response.socket.ws = this
+    this[kByteParser] = parser
+
+    // 1. Change the ready state to OPEN (1).
+    this[kReadyState] = states.OPEN
+
+    // 2. Change the extensions attribute’s value to the extensions in use, if
+    //    it is not the null value.
+    // https://datatracker.ietf.org/doc/html/rfc6455#section-9.1
+    const extensions = response.headersList.get('sec-websocket-extensions')
+
+    if (extensions !== null) {
+      this.#extensions = extensions
+    }
+
+    // 3. Change the protocol attribute’s value to the subprotocol in use, if
+    //    it is not the null value.
+    // https://datatracker.ietf.org/doc/html/rfc6455#section-1.9
+    const protocol = response.headersList.get('sec-websocket-protocol')
+
+    if (protocol !== null) {
+      this.#protocol = protocol
+    }
+
+    // 4. Fire an event named open at the WebSocket object.
+    fireEvent('open', this)
+  }
+}
+
+// https://websockets.spec.whatwg.org/#dom-websocket-connecting
+WebSocket.CONNECTING = WebSocket.prototype.CONNECTING = states.CONNECTING
+// https://websockets.spec.whatwg.org/#dom-websocket-open
+WebSocket.OPEN = WebSocket.prototype.OPEN = states.OPEN
+// https://websockets.spec.whatwg.org/#dom-websocket-closing
+WebSocket.CLOSING = WebSocket.prototype.CLOSING = states.CLOSING
+// https://websockets.spec.whatwg.org/#dom-websocket-closed
+WebSocket.CLOSED = WebSocket.prototype.CLOSED = states.CLOSED
+
+Object.defineProperties(WebSocket.prototype, {
+  CONNECTING: staticPropertyDescriptors,
+  OPEN: staticPropertyDescriptors,
+  CLOSING: staticPropertyDescriptors,
+  CLOSED: staticPropertyDescriptors,
+  url: kEnumerableProperty,
+  readyState: kEnumerableProperty,
+  bufferedAmount: kEnumerableProperty,
+  onopen: kEnumerableProperty,
+  onerror: kEnumerableProperty,
+  onclose: kEnumerableProperty,
+  close: kEnumerableProperty,
+  onmessage: kEnumerableProperty,
+  binaryType: kEnumerableProperty,
+  send: kEnumerableProperty,
+  extensions: kEnumerableProperty,
+  protocol: kEnumerableProperty,
+  [Symbol.toStringTag]: {
+    value: 'WebSocket',
+    writable: false,
+    enumerable: false,
+    configurable: true
+  }
+})
+
+Object.defineProperties(WebSocket, {
+  CONNECTING: staticPropertyDescriptors,
+  OPEN: staticPropertyDescriptors,
+  CLOSING: staticPropertyDescriptors,
+  CLOSED: staticPropertyDescriptors
+})
+
+webidl.converters['sequence<DOMString>'] = webidl.sequenceConverter(
+  webidl.converters.DOMString
+)
+
+webidl.converters['DOMString or sequence<DOMString>'] = function (V) {
+  if (webidl.util.Type(V) === 'Object' && Symbol.iterator in V) {
+    return webidl.converters['sequence<DOMString>'](V)
+  }
+
+  return webidl.converters.DOMString(V)
+}
+
+// This implements the propsal made in https://github.com/whatwg/websockets/issues/42
+webidl.converters.WebSocketInit = webidl.dictionaryConverter([
+  {
+    key: 'protocols',
+    converter: webidl.converters['DOMString or sequence<DOMString>'],
+    get defaultValue () {
+      return []
+    }
+  },
+  {
+    key: 'dispatcher',
+    converter: (V) => V,
+    get defaultValue () {
+      return getGlobalDispatcher()
+    }
+  },
+  {
+    key: 'headers',
+    converter: webidl.nullableConverter(webidl.converters.HeadersInit)
+  }
+])
+
+webidl.converters['DOMString or sequence<DOMString> or WebSocketInit'] = function (V) {
+  if (webidl.util.Type(V) === 'Object' && !(Symbol.iterator in V)) {
+    return webidl.converters.WebSocketInit(V)
+  }
+
+  return { protocols: webidl.converters['DOMString or sequence<DOMString>'](V) }
+}
+
+webidl.converters.WebSocketSendData = function (V) {
+  if (webidl.util.Type(V) === 'Object') {
+    if (isBlobLike(V)) {
+      return webidl.converters.Blob(V, { strict: false })
+    }
+
+    if (ArrayBuffer.isView(V) || types.isAnyArrayBuffer(V)) {
+      return webidl.converters.BufferSource(V)
+    }
+  }
+
+  return webidl.converters.USVString(V)
+}
+
+module.exports = {
+  WebSocket
+}