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import {
type DebuggerEvent,
type DebuggerOptions,
EffectFlags,
type Subscriber,
activeSub,
batch,
refreshComputed,
} from './effect'
import type { Ref } from './ref'
import { warn } from './warning'
import { Dep, type Link, globalVersion } from './dep'
import { ReactiveFlags, TrackOpTypes } from './constants'
declare const ComputedRefSymbol: unique symbol
declare const WritableComputedRefSymbol: unique symbol
interface BaseComputedRef<T, S = T> extends Ref<T, S> {
[ComputedRefSymbol]: true
/**
* @deprecated computed no longer uses effect
*/
effect: ComputedRefImpl
}
export interface ComputedRef<T = any> extends BaseComputedRef<T> {
readonly value: T
}
export interface WritableComputedRef<T, S = T> extends BaseComputedRef<T, S> {
[WritableComputedRefSymbol]: true
}
export type ComputedGetter<T> = (oldValue?: T) => T
export type ComputedSetter<T> = (newValue: T) => void
export interface WritableComputedOptions<T, S = T> {
get: ComputedGetter<T>
set: ComputedSetter<S>
}
/**
* @private exported by @vue/reactivity for Vue core use, but not exported from
* the main vue package
*/
export class ComputedRefImpl<T = any> implements Subscriber {
/**
* @internal
*/
_value: any = undefined
/**
* @internal
*/
readonly dep: Dep = new Dep(this)
/**
* @internal
*/
readonly __v_isRef = true
// TODO isolatedDeclarations ReactiveFlags.IS_REF
/**
* @internal
*/
readonly __v_isReadonly: boolean
// TODO isolatedDeclarations ReactiveFlags.IS_READONLY
// A computed is also a subscriber that tracks other deps
/**
* @internal
*/
deps?: Link = undefined
/**
* @internal
*/
depsTail?: Link = undefined
/**
* @internal
*/
flags: EffectFlags = EffectFlags.DIRTY
/**
* @internal
*/
globalVersion: number = globalVersion - 1
/**
* @internal
*/
isSSR: boolean
// for backwards compat
effect: this = this
// dev only
onTrack?: (event: DebuggerEvent) => void
// dev only
onTrigger?: (event: DebuggerEvent) => void
/**
* Dev only
* @internal
*/
_warnRecursive?: boolean
constructor(
public fn: ComputedGetter<T>,
private readonly setter: ComputedSetter<T> | undefined,
isSSR: boolean,
) {
this[ReactiveFlags.IS_READONLY] = !setter
this.isSSR = isSSR
}
/**
* @internal
*/
notify(): true | void {
this.flags |= EffectFlags.DIRTY
if (
!(this.flags & EffectFlags.NOTIFIED) &&
// avoid infinite self recursion
activeSub !== this
) {
batch(this)
return true
} else if (__DEV__) {
// TODO warn
}
}
get value(): T {
const link = __DEV__
? this.dep.track({
target: this,
type: TrackOpTypes.GET,
key: 'value',
})
: this.dep.track()
refreshComputed(this)
// sync version after evaluation
if (link) {
link.version = this.dep.version
}
return this._value
}
set value(newValue) {
if (this.setter) {
this.setter(newValue)
} else if (__DEV__) {
warn('Write operation failed: computed value is readonly')
}
}
}
/**
* Takes a getter function and returns a readonly reactive ref object for the
* returned value from the getter. It can also take an object with get and set
* functions to create a writable ref object.
*
* @example
* ```js
* // Creating a readonly computed ref:
* const count = ref(1)
* const plusOne = computed(() => count.value + 1)
*
* console.log(plusOne.value) // 2
* plusOne.value++ // error
* ```
*
* ```js
* // Creating a writable computed ref:
* const count = ref(1)
* const plusOne = computed({
* get: () => count.value + 1,
* set: (val) => {
* count.value = val - 1
* }
* })
*
* plusOne.value = 1
* console.log(count.value) // 0
* ```
*
* @param getter - Function that produces the next value.
* @param debugOptions - For debugging. See {@link https://vuejs.org/guide/extras/reactivity-in-depth.html#computed-debugging}.
* @see {@link https://vuejs.org/api/reactivity-core.html#computed}
*/
export function computed<T>(
getter: ComputedGetter<T>,
debugOptions?: DebuggerOptions,
): ComputedRef<T>
export function computed<T, S = T>(
options: WritableComputedOptions<T, S>,
debugOptions?: DebuggerOptions,
): WritableComputedRef<T, S>
export function computed<T>(
getterOrOptions: ComputedGetter<T> | WritableComputedOptions<T>,
debugOptions?: DebuggerOptions,
isSSR = false,
) {
let getter: ComputedGetter<T>
let setter: ComputedSetter<T> | undefined
if (isFunction(getterOrOptions)) {
getter = getterOrOptions
} else {
getter = getterOrOptions.get
setter = getterOrOptions.set
}
const cRef = new ComputedRefImpl(getter, setter, isSSR)
if (__DEV__ && debugOptions && !isSSR) {
cRef.onTrack = debugOptions.onTrack
cRef.onTrigger = debugOptions.onTrigger
}
return cRef as any
}
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