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refactor: make HMR agnostic to environment (#15179)
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@sheremet-va
sheremet-va committed Dec 1, 2023
1 parent 56ef54e commit 0571b7c
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Showing 3 changed files with 287 additions and 217 deletions.
244 changes: 27 additions & 217 deletions packages/vite/src/client/client.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import type { ErrorPayload, HMRPayload, Update } from 'types/hmrPayload'
import type { ModuleNamespace, ViteHotContext } from 'types/hot'
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'

Expand Down Expand Up @@ -110,17 +111,6 @@ function setupWebSocket(
return socket
}

function warnFailedFetch(err: Error, path: string | string[]) {
if (!err.message.match('fetch')) {
console.error(err)
}
console.error(
`[hmr] Failed to reload ${path}. ` +
`This could be due to syntax errors or importing non-existent ` +
`modules. (see errors above)`,
)
}

function cleanUrl(pathname: string): string {
const url = new URL(pathname, location.toString())
url.searchParams.delete('direct')
Expand All @@ -144,6 +134,22 @@ const debounceReload = (time: number) => {
}
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':
Expand Down Expand Up @@ -173,7 +179,7 @@ async function handleMessage(payload: HMRPayload) {
await Promise.all(
payload.updates.map(async (update): Promise<void> => {
if (update.type === 'js-update') {
return queueUpdate(fetchUpdate(update))
return queueUpdate(hmrClient.fetchUpdate(update))
}

// css-update
Expand Down Expand Up @@ -245,16 +251,7 @@ async function handleMessage(payload: HMRPayload) {
break
case 'prune':
notifyListeners('vite:beforePrune', payload)
// After an HMR update, some modules are no longer imported on the page
// but they may have left behind side effects that need to be cleaned up
// (.e.g style injections)
// TODO Trigger their dispose callbacks.
payload.paths.forEach((path) => {
const fn = pruneMap.get(path)
if (fn) {
fn(dataMap.get(path))
}
})
hmrClient.prunePaths(payload.paths)
break
case 'error': {
notifyListeners('vite:error', payload)
Expand All @@ -280,10 +277,7 @@ function notifyListeners<T extends string>(
data: InferCustomEventPayload<T>,
): void
function notifyListeners(event: string, data: any): void {
const cbs = customListenersMap.get(event)
if (cbs) {
cbs.forEach((cb) => cb(data))
}
hmrClient.notifyListeners(event, data)
}

const enableOverlay = __HMR_ENABLE_OVERLAY__
Expand Down Expand Up @@ -430,206 +424,22 @@ export function removeStyle(id: string): void {
}
}

async function fetchUpdate({
path,
acceptedPath,
timestamp,
explicitImportRequired,
}: Update) {
const mod = hotModulesMap.get(path)
if (!mod) {
// In a code-splitting project,
// it is common that the hot-updating module is not loaded yet.
// https://github.com/vitejs/vite/issues/721
return
}

let fetchedModule: ModuleNamespace | undefined
const isSelfUpdate = path === acceptedPath

// determine the qualified callbacks before we re-import the modules
const qualifiedCallbacks = mod.callbacks.filter(({ deps }) =>
deps.includes(acceptedPath),
)

if (isSelfUpdate || qualifiedCallbacks.length > 0) {
const disposer = disposeMap.get(acceptedPath)
if (disposer) await disposer(dataMap.get(acceptedPath))
const [acceptedPathWithoutQuery, query] = acceptedPath.split(`?`)
try {
fetchedModule = await import(
/* @vite-ignore */
base +
acceptedPathWithoutQuery.slice(1) +
`?${explicitImportRequired ? 'import&' : ''}t=${timestamp}${
query ? `&${query}` : ''
}`
)
} catch (e) {
warnFailedFetch(e, acceptedPath)
}
}

return () => {
for (const { deps, fn } of qualifiedCallbacks) {
fn(deps.map((dep) => (dep === acceptedPath ? fetchedModule : undefined)))
}
const loggedPath = isSelfUpdate ? path : `${acceptedPath} via ${path}`
console.debug(`[vite] hot updated: ${loggedPath}`)
}
}

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

interface HotModule {
id: string
callbacks: HotCallback[]
}

interface HotCallback {
// the dependencies must be fetchable paths
deps: string[]
fn: (modules: Array<ModuleNamespace | undefined>) => void
}

type CustomListenersMap = Map<string, ((data: any) => void)[]>

const hotModulesMap = new Map<string, HotModule>()
const disposeMap = new Map<string, (data: any) => void | Promise<void>>()
const pruneMap = new Map<string, (data: any) => void | Promise<void>>()
const dataMap = new Map<string, any>()
const customListenersMap: CustomListenersMap = new Map()
const ctxToListenersMap = new Map<string, CustomListenersMap>()

export function createHotContext(ownerPath: string): ViteHotContext {
if (!dataMap.has(ownerPath)) {
dataMap.set(ownerPath, {})
}

// when a file is hot updated, a new context is created
// clear its stale callbacks
const mod = hotModulesMap.get(ownerPath)
if (mod) {
mod.callbacks = []
}

// clear stale custom event listeners
const staleListeners = ctxToListenersMap.get(ownerPath)
if (staleListeners) {
for (const [event, staleFns] of staleListeners) {
const listeners = customListenersMap.get(event)
if (listeners) {
customListenersMap.set(
event,
listeners.filter((l) => !staleFns.includes(l)),
)
}
}
}

const newListeners: CustomListenersMap = new Map()
ctxToListenersMap.set(ownerPath, newListeners)

function acceptDeps(deps: string[], callback: HotCallback['fn'] = () => {}) {
const mod: HotModule = hotModulesMap.get(ownerPath) || {
id: ownerPath,
callbacks: [],
}
mod.callbacks.push({
deps,
fn: callback,
})
hotModulesMap.set(ownerPath, mod)
}

const hot: ViteHotContext = {
get data() {
return dataMap.get(ownerPath)
},

accept(deps?: any, callback?: any) {
if (typeof deps === 'function' || !deps) {
// self-accept: hot.accept(() => {})
acceptDeps([ownerPath], ([mod]) => deps?.(mod))
} else if (typeof deps === 'string') {
// explicit deps
acceptDeps([deps], ([mod]) => callback?.(mod))
} else if (Array.isArray(deps)) {
acceptDeps(deps, callback)
} else {
throw new Error(`invalid hot.accept() usage.`)
}
},

// export names (first arg) are irrelevant on the client side, they're
// extracted in the server for propagation
acceptExports(_, callback) {
acceptDeps([ownerPath], ([mod]) => callback?.(mod))
return new HMRContext(ownerPath, hmrClient, {
addBuffer(message) {
messageBuffer.push(message)
},

dispose(cb) {
disposeMap.set(ownerPath, cb)
},

prune(cb) {
pruneMap.set(ownerPath, cb)
},

// Kept for backward compatibility (#11036)
// @ts-expect-error untyped
// eslint-disable-next-line @typescript-eslint/no-empty-function
decline() {},

// tell the server to re-perform hmr propagation from this module as root
invalidate(message) {
notifyListeners('vite:invalidate', { path: ownerPath, message })
this.send('vite:invalidate', { path: ownerPath, message })
console.debug(
`[vite] invalidate ${ownerPath}${message ? `: ${message}` : ''}`,
)
},

// custom events
on(event, cb) {
const addToMap = (map: Map<string, any[]>) => {
const existing = map.get(event) || []
existing.push(cb)
map.set(event, existing)
}
addToMap(customListenersMap)
addToMap(newListeners)
},

// remove a custom event
off(event, cb) {
const removeFromMap = (map: Map<string, any[]>) => {
const existing = map.get(event)
if (existing === undefined) {
return
}
const pruned = existing.filter((l) => l !== cb)
if (pruned.length === 0) {
map.delete(event)
return
}
map.set(event, pruned)
}
removeFromMap(customListenersMap)
removeFromMap(newListeners)
},

send(event, data) {
messageBuffer.push(JSON.stringify({ type: 'custom', event, data }))
send() {
sendMessageBuffer()
},
}

return hot
})
}

/**
Expand Down
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