client.ts

import type { ErrorPayload, HMRPayload } from 'types/hmrPayload'
import type { ViteHotContext } from 'types/hot'
import type { InferCustomEventPayload } from 'types/customEvent'
import { HMRClient, HMRContext } from '../shared/hmr'
import { ErrorOverlay, overlayId } from './overlay'
import '@vite/env'

// injected by the hmr plugin when served
declare const __BASE__: string
declare const __SERVER_HOST__: string
declare const __HMR_PROTOCOL__: string | null
declare const __HMR_HOSTNAME__: string | null
declare const __HMR_PORT__: number | null
declare const __HMR_DIRECT_TARGET__: string
declare const __HMR_BASE__: string
declare const __HMR_TIMEOUT__: number
declare const __HMR_ENABLE_OVERLAY__: boolean

console.debug('[vite] connecting...')

const importMetaUrl = new URL(import.meta.url)

// use server configuration, then fallback to inference
const serverHost = __SERVER_HOST__
const socketProtocol =
  __HMR_PROTOCOL__ || (importMetaUrl.protocol === 'https:' ? 'wss' : 'ws')
const hmrPort = __HMR_PORT__
const socketHost = `${__HMR_HOSTNAME__ || importMetaUrl.hostname}:${
  hmrPort || importMetaUrl.port
}${__HMR_BASE__}`
const directSocketHost = __HMR_DIRECT_TARGET__
const base = __BASE__ || '/'
const messageBuffer: string[] = []

let socket: WebSocket
try {
  let fallback: (() => void) | undefined
  // only use fallback when port is inferred to prevent confusion
  if (!hmrPort) {
    fallback = () => {
      // fallback to connecting directly to the hmr server
      // for servers which does not support proxying websocket
      socket = setupWebSocket(socketProtocol, directSocketHost, () => {
        const currentScriptHostURL = new URL(import.meta.url)
        const currentScriptHost =
          currentScriptHostURL.host +
          currentScriptHostURL.pathname.replace(/@vite\/client$/, '')
        console.error(
          '[vite] failed to connect to websocket.\n' +
            'your current setup:\n' +
            `  (browser) ${currentScriptHost} <--[HTTP]--> ${serverHost} (server)\n` +
            `  (browser) ${socketHost} <--[WebSocket (failing)]--> ${directSocketHost} (server)\n` +
            'Check out your Vite / network configuration and https://vitejs.dev/config/server-options.html#server-hmr .',
        )
      })
      socket.addEventListener(
        'open',
        () => {
          console.info(
            '[vite] Direct websocket connection fallback. Check out https://vitejs.dev/config/server-options.html#server-hmr to remove the previous connection error.',
          )
        },
        { once: true },
      )
    }
  }

  socket = setupWebSocket(socketProtocol, socketHost, fallback)
} catch (error) {
  console.error(`[vite] failed to connect to websocket (${error}). `)
}

function setupWebSocket(
  protocol: string,
  hostAndPath: string,
  onCloseWithoutOpen?: () => void,
) {
  const socket = new WebSocket(`${protocol}://${hostAndPath}`, 'vite-hmr')
  let isOpened = false

  socket.addEventListener(
    'open',
    () => {
      isOpened = true
      notifyListeners('vite:ws:connect', { webSocket: socket })
    },
    { once: true },
  )

  // Listen for messages
  socket.addEventListener('message', async ({ data }) => {
    handleMessage(JSON.parse(data))
  })

  // ping server
  socket.addEventListener('close', async ({ wasClean }) => {
    if (wasClean) return

    if (!isOpened && onCloseWithoutOpen) {
      onCloseWithoutOpen()
      return
    }

    notifyListeners('vite:ws:disconnect', { webSocket: socket })

    console.log(`[vite] server connection lost. polling for restart...`)
    await waitForSuccessfulPing(protocol, hostAndPath)
    location.reload()
  })

  return socket
}

function cleanUrl(pathname: string): string {
  const url = new URL(pathname, location.toString())
  url.searchParams.delete('direct')
  return url.pathname + url.search
}

let isFirstUpdate = true
const outdatedLinkTags = new WeakSet<HTMLLinkElement>()

const debounceReload = (time: number) => {
  let timer: ReturnType<typeof setTimeout> | null
  return () => {
    if (timer) {
      clearTimeout(timer)
      timer = null
    }
    timer = setTimeout(() => {
      location.reload()
    }, time)
  }
}
const pageReload = debounceReload(50)

const hmrClient = new HMRClient(console, async function importUpdatedModule({
  acceptedPath,
  timestamp,
  explicitImportRequired,
}) {
  const [acceptedPathWithoutQuery, query] = acceptedPath.split(`?`)
  return await import(
    /* @vite-ignore */
    base +
      acceptedPathWithoutQuery.slice(1) +
      `?${explicitImportRequired ? 'import&' : ''}t=${timestamp}${
        query ? `&${query}` : ''
      }`
  )
})

async function handleMessage(payload: HMRPayload) {
  switch (payload.type) {
    case 'connected':
      console.debug(`[vite] connected.`)
      sendMessageBuffer()
      // proxy(nginx, docker) hmr ws maybe caused timeout,
      // so send ping package let ws keep alive.
      setInterval(() => {
        if (socket.readyState === socket.OPEN) {
          socket.send('{"type":"ping"}')
        }
      }, __HMR_TIMEOUT__)
      break
    case 'update':
      notifyListeners('vite:beforeUpdate', payload)
      // if this is the first update and there's already an error overlay, it
      // means the page opened with existing server compile error and the whole
      // module script failed to load (since one of the nested imports is 500).
      // in this case a normal update won't work and a full reload is needed.
      if (isFirstUpdate && hasErrorOverlay()) {
        window.location.reload()
        return
      } else {
        clearErrorOverlay()
        isFirstUpdate = false
      }
      await Promise.all(
        payload.updates.map(async (update): Promise<void> => {
          if (update.type === 'js-update') {
            return queueUpdate(hmrClient.fetchUpdate(update))
          }

          // css-update
          // this is only sent when a css file referenced with <link> is updated
          const { path, timestamp } = update
          const searchUrl = cleanUrl(path)
          // can't use querySelector with `[href*=]` here since the link may be
          // using relative paths so we need to use link.href to grab the full
          // URL for the include check.
          const el = Array.from(
            document.querySelectorAll<HTMLLinkElement>('link'),
          ).find(
            (e) =>
              !outdatedLinkTags.has(e) && cleanUrl(e.href).includes(searchUrl),
          )

          if (!el) {
            return
          }

          const newPath = `${base}${searchUrl.slice(1)}${
            searchUrl.includes('?') ? '&' : '?'
          }t=${timestamp}`

          // rather than swapping the href on the existing tag, we will
          // create a new link tag. Once the new stylesheet has loaded we
          // will remove the existing link tag. This removes a Flash Of
          // Unstyled Content that can occur when swapping out the tag href
          // directly, as the new stylesheet has not yet been loaded.
          return new Promise((resolve) => {
            const newLinkTag = el.cloneNode() as HTMLLinkElement
            newLinkTag.href = new URL(newPath, el.href).href
            const removeOldEl = () => {
              el.remove()
              console.debug(`[vite] css hot updated: ${searchUrl}`)
              resolve()
            }
            newLinkTag.addEventListener('load', removeOldEl)
            newLinkTag.addEventListener('error', removeOldEl)
            outdatedLinkTags.add(el)
            el.after(newLinkTag)
          })
        }),
      )
      notifyListeners('vite:afterUpdate', payload)
      break
    case 'custom': {
      notifyListeners(payload.event, payload.data)
      break
    }
    case 'full-reload':
      notifyListeners('vite:beforeFullReload', payload)
      if (payload.path && payload.path.endsWith('.html')) {
        // if html file is edited, only reload the page if the browser is
        // currently on that page.
        const pagePath = decodeURI(location.pathname)
        const payloadPath = base + payload.path.slice(1)
        if (
          pagePath === payloadPath ||
          payload.path === '/index.html' ||
          (pagePath.endsWith('/') && pagePath + 'index.html' === payloadPath)
        ) {
          pageReload()
        }
        return
      } else {
        pageReload()
      }
      break
    case 'prune':
      notifyListeners('vite:beforePrune', payload)
      hmrClient.prunePaths(payload.paths)
      break
    case 'error': {
      notifyListeners('vite:error', payload)
      const err = payload.err
      if (enableOverlay) {
        createErrorOverlay(err)
      } else {
        console.error(
          `[vite] Internal Server Error\n${err.message}\n${err.stack}`,
        )
      }
      break
    }
    default: {
      const check: never = payload
      return check
    }
  }
}

function notifyListeners<T extends string>(
  event: T,
  data: InferCustomEventPayload<T>,
): void
function notifyListeners(event: string, data: any): void {
  hmrClient.notifyListeners(event, data)
}

const enableOverlay = __HMR_ENABLE_OVERLAY__

function createErrorOverlay(err: ErrorPayload['err']) {
  clearErrorOverlay()
  document.body.appendChild(new ErrorOverlay(err))
}

function clearErrorOverlay() {
  document.querySelectorAll<ErrorOverlay>(overlayId).forEach((n) => n.close())
}

function hasErrorOverlay() {
  return document.querySelectorAll(overlayId).length
}

let pending = false
let queued: Promise<(() => void) | undefined>[] = []

/**
 * buffer multiple hot updates triggered by the same src change
 * so that they are invoked in the same order they were sent.
 * (otherwise the order may be inconsistent because of the http request round trip)
 */
async function queueUpdate(p: Promise<(() => void) | undefined>) {
  queued.push(p)
  if (!pending) {
    pending = true
    await Promise.resolve()
    pending = false
    const loading = [...queued]
    queued = []
    ;(await Promise.all(loading)).forEach((fn) => fn && fn())
  }
}

async function waitForSuccessfulPing(
  socketProtocol: string,
  hostAndPath: string,
  ms = 1000,
) {
  const pingHostProtocol = socketProtocol === 'wss' ? 'https' : 'http'

  const ping = async () => {
    // A fetch on a websocket URL will return a successful promise with status 400,
    // but will reject a networking error.
    // When running on middleware mode, it returns status 426, and an cors error happens if mode is not no-cors
    try {
      await fetch(`${pingHostProtocol}://${hostAndPath}`, {
        mode: 'no-cors',
        headers: {
          // Custom headers won't be included in a request with no-cors so (ab)use one of the
          // safelisted headers to identify the ping request
          Accept: 'text/x-vite-ping',
        },
      })
      return true
    } catch {}
    return false
  }

  if (await ping()) {
    return
  }
  await wait(ms)

  // eslint-disable-next-line no-constant-condition
  while (true) {
    if (document.visibilityState === 'visible') {
      if (await ping()) {
        break
      }
      await wait(ms)
    } else {
      await waitForWindowShow()
    }
  }
}

function wait(ms: number) {
  return new Promise((resolve) => setTimeout(resolve, ms))
}

function waitForWindowShow() {
  return new Promise<void>((resolve) => {
    const onChange = async () => {
      if (document.visibilityState === 'visible') {
        resolve()
        document.removeEventListener('visibilitychange', onChange)
      }
    }
    document.addEventListener('visibilitychange', onChange)
  })
}

const sheetsMap = new Map<string, HTMLStyleElement>()

// collect existing style elements that may have been inserted during SSR
// to avoid FOUC or duplicate styles
if ('document' in globalThis) {
  document
    .querySelectorAll<HTMLStyleElement>('style[data-vite-dev-id]')
    .forEach((el) => {
      sheetsMap.set(el.getAttribute('data-vite-dev-id')!, el)
    })
}

// all css imports should be inserted at the same position
// because after build it will be a single css file
let lastInsertedStyle: HTMLStyleElement | undefined

export function updateStyle(id: string, content: string): void {
  let style = sheetsMap.get(id)
  if (!style) {
    style = document.createElement('style')
    style.setAttribute('type', 'text/css')
    style.setAttribute('data-vite-dev-id', id)
    style.textContent = content

    if (!lastInsertedStyle) {
      document.head.appendChild(style)

      // reset lastInsertedStyle after async
      // because dynamically imported css will be splitted into a different file
      setTimeout(() => {
        lastInsertedStyle = undefined
      }, 0)
    } else {
      lastInsertedStyle.insertAdjacentElement('afterend', style)
    }
    lastInsertedStyle = style
  } else {
    style.textContent = content
  }
  sheetsMap.set(id, style)
}

export function removeStyle(id: string): void {
  const style = sheetsMap.get(id)
  if (style) {
    document.head.removeChild(style)
    sheetsMap.delete(id)
  }
}

function sendMessageBuffer() {
  if (socket.readyState === 1) {
    messageBuffer.forEach((msg) => socket.send(msg))
    messageBuffer.length = 0
  }
}

export function createHotContext(ownerPath: string): ViteHotContext {
  return new HMRContext(ownerPath, hmrClient, {
    addBuffer(message) {
      messageBuffer.push(message)
    },
    send() {
      sendMessageBuffer()
    },
  })
}

/**
 * urls here are dynamic import() urls that couldn't be statically analyzed
 */
export function injectQuery(url: string, queryToInject: string): string {
  // skip urls that won't be handled by vite
  if (url[0] !== '.' && url[0] !== '/') {
    return url
  }

  // can't use pathname from URL since it may be relative like ../
  const pathname = url.replace(/[?#].*$/s, '')
  const { search, hash } = new URL(url, 'http://vitejs.dev')

  return `${pathname}?${queryToInject}${search ? `&` + search.slice(1) : ''}${
    hash || ''
  }`
}

export { ErrorOverlay }