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import {
ConcreteComponent,
ComponentInternalInstance,
ComponentOptions,
InternalRenderFunction,
ClassComponent,
isClassComponent
} from './component'
import { queueJob, queuePostFlushCb } from './scheduler'
import { extend, getGlobalThis } from '@vue/shared'
type HMRComponent = ComponentOptions | ClassComponent
export let isHmrUpdating = false
export const hmrDirtyComponents = new Set<ConcreteComponent>()
export interface HMRRuntime {
createRecord: typeof createRecord
rerender: typeof rerender
reload: typeof reload
}
// Expose the HMR runtime on the global object
// This makes it entirely tree-shakable without polluting the exports and makes
// it easier to be used in toolings like vue-loader
// Note: for a component to be eligible for HMR it also needs the __hmrId option
// to be set so that its instances can be registered / removed.
if (__DEV__) {
getGlobalThis().__VUE_HMR_RUNTIME__ = {
createRecord: tryWrap(createRecord),
rerender: tryWrap(rerender),
reload: tryWrap(reload)
} as HMRRuntime
}
const map: Map<
string,
{
// the initial component definition is recorded on import - this allows us
// to apply hot updates to the component even when there are no actively
// rendered instance.
initialDef: ComponentOptions
instances: Set<ComponentInternalInstance>
}
> = new Map()
export function registerHMR(instance: ComponentInternalInstance) {
const id = instance.type.__hmrId!
let record = map.get(id)
Iif (!record) {
createRecord(id, instance.type as HMRComponent)
record = map.get(id)!
}
record.instances.add(instance)
}
export function unregisterHMR(instance: ComponentInternalInstance) {
map.get(instance.type.__hmrId!)!.instances.delete(instance)
}
function createRecord(id: string, initialDef: HMRComponent): boolean {
if (map.has(id)) {
return false
}
map.set(id, {
initialDef: normalizeClassComponent(initialDef),
instances: new Set()
})
return true
}
function normalizeClassComponent(component: HMRComponent): ComponentOptions {
return isClassComponent(component) ? component.__vccOpts : component
}
function rerender(id: string, newRender?: Function) {
const record = map.get(id)
Iif (!record) {
return
}
// update initial record (for not-yet-rendered component)
record.initialDef.render = newRender
// Create a snapshot which avoids the set being mutated during updates
;[...record.instances].forEach(instance => {
if (newRender) {
instance.render = newRender as InternalRenderFunction
normalizeClassComponent(instance.type as HMRComponent).render = newRender
}
instance.renderCache = []
// this flag forces child components with slot content to update
isHmrUpdating = true
instance.update()
isHmrUpdating = false
})
}
function reload(id: string, newComp: HMRComponent) {
const record = map.get(id)
Iif (!record) return
newComp = normalizeClassComponent(newComp)
// update initial def (for not-yet-rendered components)
updateComponentDef(record.initialDef, newComp)
// create a snapshot which avoids the set being mutated during updates
const instances = [...record.instances]
for (const instance of instances) {
const oldComp = normalizeClassComponent(instance.type as HMRComponent)
if (!hmrDirtyComponents.has(oldComp)) {
// 1. Update existing comp definition to match new one
Iif (oldComp !== record.initialDef) {
updateComponentDef(oldComp, newComp)
}
// 2. mark definition dirty. This forces the renderer to replace the
// component on patch.
hmrDirtyComponents.add(oldComp)
}
// 3. invalidate options resolution cache
instance.appContext.optionsCache.delete(instance.type as any)
// 4. actually update
Iif (instance.ceReload) {
// custom element
hmrDirtyComponents.add(oldComp)
instance.ceReload((newComp as any).styles)
hmrDirtyComponents.delete(oldComp)
} else if (instance.parent) {
// 4. Force the parent instance to re-render. This will cause all updated
// components to be unmounted and re-mounted. Queue the update so that we
// don't end up forcing the same parent to re-render multiple times.
queueJob(instance.parent.update)
// instance is the inner component of an async custom element
// invoke to reset styles
Iif (
(instance.parent.type as ComponentOptions).__asyncLoader &&
instance.parent.ceReload
) {
instance.parent.ceReload((newComp as any).styles)
}
} else Eif (instance.appContext.reload) {
// root instance mounted via createApp() has a reload method
instance.appContext.reload()
} else if (typeof window !== 'undefined') {
// root instance inside tree created via raw render(). Force reload.
window.location.reload()
} else {
console.warn(
'[HMR] Root or manually mounted instance modified. Full reload required.'
)
}
}
// 5. make sure to cleanup dirty hmr components after update
queuePostFlushCb(() => {
for (const instance of instances) {
hmrDirtyComponents.delete(
normalizeClassComponent(instance.type as HMRComponent)
)
}
})
}
function updateComponentDef(
oldComp: ComponentOptions,
newComp: ComponentOptions
) {
extend(oldComp, newComp)
for (const key in oldComp) {
if (key !== '__file' && !(key in newComp)) {
delete (oldComp as any)[key]
}
}
}
function tryWrap(fn: (id: string, arg: any) => any): Function {
return (id: string, arg: any) => {
try {
return fn(id, arg)
} catch (e: any) {
console.error(e)
console.warn(
`[HMR] Something went wrong during Vue component hot-reload. ` +
`Full reload required.`
)
}
}
}
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