/
handleHotUpdate.ts
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/
handleHotUpdate.ts
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import _debug from 'debug'
import type { SFCBlock, SFCDescriptor } from 'vue/compiler-sfc'
import type { HmrContext, ModuleNode } from 'vite'
import {
createDescriptor,
getDescriptor,
setPrevDescriptor
} from './utils/descriptorCache'
import { getResolvedScript, setResolvedScript } from './script'
import type { ResolvedOptions } from '.'
const debug = _debug('vite:hmr')
const directRequestRE = /(\?|&)direct\b/
/**
* Vite-specific HMR handling
*/
export async function handleHotUpdate(
{ file, modules, read, server }: HmrContext,
options: ResolvedOptions
): Promise<ModuleNode[] | void> {
const prevDescriptor = getDescriptor(file, options, false)
if (!prevDescriptor) {
// file hasn't been requested yet (e.g. async component)
return
}
setPrevDescriptor(file, prevDescriptor)
const content = await read()
const { descriptor } = createDescriptor(file, content, options)
let needRerender = false
const affectedModules = new Set<ModuleNode | undefined>()
const mainModule = modules.find(
(m) => !/type=/.test(m.url) || /type=script/.test(m.url)
)
const templateModule = modules.find((m) => /type=template/.test(m.url))
if (hasScriptChanged(prevDescriptor, descriptor)) {
let scriptModule: ModuleNode | undefined
if (
(descriptor.scriptSetup?.lang && !descriptor.scriptSetup.src) ||
(descriptor.script?.lang && !descriptor.script.src)
) {
const scriptModuleRE = new RegExp(
`type=script.*&lang\.${
descriptor.scriptSetup?.lang || descriptor.script?.lang
}$`
)
scriptModule = modules.find((m) => scriptModuleRE.test(m.url))
}
affectedModules.add(scriptModule || mainModule)
}
if (!isEqualBlock(descriptor.template, prevDescriptor.template)) {
// when a <script setup> component's template changes, it will need correct
// binding metadata. However, when reloading the template alone the binding
// metadata will not be available since the script part isn't loaded.
// in this case, reuse the compiled script from previous descriptor.
if (mainModule && !affectedModules.has(mainModule)) {
setResolvedScript(
descriptor,
getResolvedScript(prevDescriptor, false)!,
false
)
}
affectedModules.add(templateModule)
needRerender = true
}
let didUpdateStyle = false
const prevStyles = prevDescriptor.styles || []
const nextStyles = descriptor.styles || []
// force reload if CSS vars injection changed
if (prevDescriptor.cssVars.join('') !== descriptor.cssVars.join('')) {
affectedModules.add(mainModule)
}
// force reload if scoped status has changed
if (prevStyles.some((s) => s.scoped) !== nextStyles.some((s) => s.scoped)) {
// template needs to be invalidated as well
affectedModules.add(templateModule)
affectedModules.add(mainModule)
}
// only need to update styles if not reloading, since reload forces
// style updates as well.
for (let i = 0; i < nextStyles.length; i++) {
const prev = prevStyles[i]
const next = nextStyles[i]
if (!prev || !isEqualBlock(prev, next)) {
didUpdateStyle = true
const mod = modules.find(
(m) =>
m.url.includes(`type=style&index=${i}`) &&
m.url.endsWith(`.${next.lang || 'css'}`) &&
!directRequestRE.test(m.url)
)
if (mod) {
affectedModules.add(mod)
if (mod.url.includes('&inline')) {
affectedModules.add(mainModule)
}
} else {
// new style block - force reload
affectedModules.add(mainModule)
}
}
}
if (prevStyles.length > nextStyles.length) {
// style block removed - force reload
affectedModules.add(mainModule)
}
const prevCustoms = prevDescriptor.customBlocks || []
const nextCustoms = descriptor.customBlocks || []
// custom blocks update causes a reload
// because the custom block contents is changed and it may be used in JS.
if (prevCustoms.length !== nextCustoms.length) {
// block removed/added, force reload
affectedModules.add(mainModule)
} else {
for (let i = 0; i < nextCustoms.length; i++) {
const prev = prevCustoms[i]
const next = nextCustoms[i]
if (!prev || !isEqualBlock(prev, next)) {
const mod = modules.find((m) =>
m.url.includes(`type=${prev.type}&index=${i}`)
)
if (mod) {
affectedModules.add(mod)
} else {
affectedModules.add(mainModule)
}
}
}
}
const updateType = []
if (needRerender) {
updateType.push(`template`)
// template is inlined into main, add main module instead
if (!templateModule) {
affectedModules.add(mainModule)
} else if (mainModule && !affectedModules.has(mainModule)) {
const styleImporters = [...mainModule.importers].filter((m) =>
/\.css($|\?)/.test(m.url)
)
styleImporters.forEach((m) => affectedModules.add(m))
}
}
if (didUpdateStyle) {
updateType.push(`style`)
}
if (updateType.length) {
debug(`[vue:update(${updateType.join('&')})] ${file}`)
}
return [...affectedModules].filter(Boolean) as ModuleNode[]
}
export function isEqualBlock(a: SFCBlock | null, b: SFCBlock | null): boolean {
if (!a && !b) return true
if (!a || !b) return false
// src imports will trigger their own updates
if (a.src && b.src && a.src === b.src) return true
if (a.content !== b.content) return false
const keysA = Object.keys(a.attrs)
const keysB = Object.keys(b.attrs)
if (keysA.length !== keysB.length) {
return false
}
return keysA.every((key) => a.attrs[key] === b.attrs[key])
}
export function isOnlyTemplateChanged(
prev: SFCDescriptor,
next: SFCDescriptor
): boolean {
return (
!hasScriptChanged(prev, next) &&
prev.styles.length === next.styles.length &&
prev.styles.every((s, i) => isEqualBlock(s, next.styles[i])) &&
prev.customBlocks.length === next.customBlocks.length &&
prev.customBlocks.every((s, i) => isEqualBlock(s, next.customBlocks[i]))
)
}
function hasScriptChanged(prev: SFCDescriptor, next: SFCDescriptor): boolean {
if (!isEqualBlock(prev.script, next.script)) {
return true
}
if (!isEqualBlock(prev.scriptSetup, next.scriptSetup)) {
return true
}
// vue core #3176
// <script setup lang="ts"> prunes non-unused imports
// the imports pruning depends on template, so script may need to re-compile
// based on template changes
const prevResolvedScript = getResolvedScript(prev, false)
// this is only available in vue@^3.2.23
const prevImports = prevResolvedScript?.imports
if (prevImports) {
return next.shouldForceReload(prevImports)
}
return false
}