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EMPTY_OBJ,
type OverloadParameters,
type UnionToIntersection,
camelize,
extend,
hasOwn,
hyphenate,
isArray,
isFunction,
isObject,
isOn,
isString,
looseToNumber,
toHandlerKey,
} from '@vue/shared'
import {
type ComponentInternalInstance,
type ComponentOptions,
type ConcreteComponent,
formatComponentName,
} from './component'
import { ErrorCodes, callWithAsyncErrorHandling } from './errorHandling'
import { warn } from './warning'
import { devtoolsComponentEmit } from './devtools'
import type { AppContext } from './apiCreateApp'
import { emit as compatInstanceEmit } from './compat/instanceEventEmitter'
import {
compatModelEmit,
compatModelEventPrefix,
} from './compat/componentVModel'
import type { ComponentTypeEmits } from './apiSetupHelpers'
import { getModelModifiers } from './helpers/useModel'
import type { ComponentPublicInstance } from './componentPublicInstance'
export type ObjectEmitsOptions = Record<
string,
((...args: any[]) => any) | null
>
export type EmitsOptions = ObjectEmitsOptions | string[]
export type EmitsToProps<T extends EmitsOptions | ComponentTypeEmits> =
T extends string[]
? {
[K in `on${Capitalize<T[number]>}`]?: (...args: any[]) => any
}
: T extends ObjectEmitsOptions
? {
[K in string & keyof T as `on${Capitalize<K>}`]?: (
...args: T[K] extends (...args: infer P) => any
? P
: T[K] extends null
? any[]
: never
) => any
}
: {}
export type TypeEmitsToOptions<T extends ComponentTypeEmits> = {
[K in keyof T & string]: T[K] extends [...args: infer Args]
? (...args: Args) => any
: () => any
} & (T extends (...args: any[]) => any
? ParametersToFns<OverloadParameters<T>>
: {})
type ParametersToFns<T extends any[]> = {
[K in T[0]]: IsStringLiteral<K> extends true
? (
...args: T extends [e: infer E, ...args: infer P]
? K extends E
? P
: never
: never
) => any
: never
}
type IsStringLiteral<T> = T extends string
? string extends T
? false
: true
: false
export type ShortEmitsToObject<E> =
E extends Record<string, any[]>
? {
[K in keyof E]: (...args: E[K]) => any
}
: E
export type EmitFn<
Options = ObjectEmitsOptions,
Event extends keyof Options = keyof Options,
> =
Options extends Array<infer V>
? (event: V, ...args: any[]) => void
: {} extends Options // if the emit is empty object (usually the default value for emit) should be converted to function
? (event: string, ...args: any[]) => void
: UnionToIntersection<
{
[key in Event]: Options[key] extends (...args: infer Args) => any
? (event: key, ...args: Args) => void
: Options[key] extends any[]
? (event: key, ...args: Options[key]) => void
: (event: key, ...args: any[]) => void
}[Event]
>
export function emit(
instance: ComponentInternalInstance,
event: string,
...rawArgs: any[]
): ComponentPublicInstance | null | undefined {
if (instance.isUnmounted) return
const props = instance.vnode.props || EMPTY_OBJ
if (__DEV__) {
const {
emitsOptions,
propsOptions: [propsOptions],
} = instance
if (emitsOptions) {
if (
!(event in emitsOptions) &&
!(
__COMPAT__ &&
(event.startsWith('hook:') ||
event.startsWith(compatModelEventPrefix))
)
) {
if (!propsOptions || !(toHandlerKey(camelize(event)) in propsOptions)) {
warn(
`Component emitted event "${event}" but it is neither declared in ` +
`the emits option nor as an "${toHandlerKey(camelize(event))}" prop.`,
)
}
} else {
const validator = emitsOptions[event]
if (isFunction(validator)) {
const isValid = validator(...rawArgs)
if (!isValid) {
warn(
`Invalid event arguments: event validation failed for event "${event}".`,
)
}
}
}
}
}
let args = rawArgs
const isModelListener = event.startsWith('update:')
// for v-model update:xxx events, apply modifiers on args
const modifiers = isModelListener && getModelModifiers(props, event.slice(7))
if (modifiers) {
if (modifiers.trim) {
args = rawArgs.map(a => (isString(a) ? a.trim() : a))
}
if (modifiers.number) {
args = rawArgs.map(looseToNumber)
}
}
if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) {
devtoolsComponentEmit(instance, event, args)
}
if (__DEV__) {
const lowerCaseEvent = event.toLowerCase()
if (lowerCaseEvent !== event && props[toHandlerKey(lowerCaseEvent)]) {
warn(
`Event "${lowerCaseEvent}" is emitted in component ` +
`${formatComponentName(
instance,
instance.type,
)} but the handler is registered for "${event}". ` +
`Note that HTML attributes are case-insensitive and you cannot use ` +
`v-on to listen to camelCase events when using in-DOM templates. ` +
`You should probably use "${hyphenate(
event,
)}" instead of "${event}".`,
)
}
}
let handlerName
let handler =
props[(handlerName = toHandlerKey(event))] ||
// also try camelCase event handler (#2249)
props[(handlerName = toHandlerKey(camelize(event)))]
// for v-model update:xxx events, also trigger kebab-case equivalent
// for props passed via kebab-case
if (!handler && isModelListener) {
handler = props[(handlerName = toHandlerKey(hyphenate(event)))]
}
if (handler) {
callWithAsyncErrorHandling(
handler,
instance,
ErrorCodes.COMPONENT_EVENT_HANDLER,
args,
)
}
const onceHandler = props[handlerName + `Once`]
if (onceHandler) {
if (!instance.emitted) {
instance.emitted = {}
} else if (instance.emitted[handlerName]) {
return
}
instance.emitted[handlerName] = true
callWithAsyncErrorHandling(
onceHandler,
instance,
ErrorCodes.COMPONENT_EVENT_HANDLER,
args,
)
}
if (__COMPAT__) {
compatModelEmit(instance, event, args)
return compatInstanceEmit(instance, event, args)
}
}
export function normalizeEmitsOptions(
comp: ConcreteComponent,
appContext: AppContext,
asMixin = false,
): ObjectEmitsOptions | null {
const cache = appContext.emitsCache
const cached = cache.get(comp)
if (cached !== undefined) {
return cached
}
const raw = comp.emits
let normalized: ObjectEmitsOptions = {}
// apply mixin/extends props
let hasExtends = false
if (__FEATURE_OPTIONS_API__ && !isFunction(comp)) {
const extendEmits = (raw: ComponentOptions) => {
const normalizedFromExtend = normalizeEmitsOptions(raw, appContext, true)
if (normalizedFromExtend) {
hasExtends = true
extend(normalized, normalizedFromExtend)
}
}
if (!asMixin && appContext.mixins.length) {
appContext.mixins.forEach(extendEmits)
}
if (comp.extends) {
extendEmits(comp.extends)
}
if (comp.mixins) {
comp.mixins.forEach(extendEmits)
}
}
if (!raw && !hasExtends) {
if (isObject(comp)) {
cache.set(comp, null)
}
return null
}
if (isArray(raw)) {
raw.forEach(key => (normalized[key] = null))
} else {
extend(normalized, raw)
}
if (isObject(comp)) {
cache.set(comp, normalized)
}
return normalized
}
// Check if an incoming prop key is a declared emit event listener.
// e.g. With `emits: { click: null }`, props named `onClick` and `onclick` are
// both considered matched listeners.
export function isEmitListener(
options: ObjectEmitsOptions | null,
key: string,
): boolean {
if (!options || !isOn(key)) {
return false
}
if (__COMPAT__ && key.startsWith(compatModelEventPrefix)) {
return true
}
key = key.slice(2).replace(/Once$/, '')
return (
hasOwn(options, key[0].toLowerCase() + key.slice(1)) ||
hasOwn(options, hyphenate(key)) ||
hasOwn(options, key)
)
}
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