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IfAny<T, Ref<T>, T> : Ref<UnwrapRef<T>, UnwrapRef<T> | T> export function ref<T = any>(): Ref<T | undefined> export function ref(value?: unknown) { return createRef(value, false) } declare const ShallowRefMarker: unique symbol export type ShallowRef<T = any, S = T> = Ref<T, S> & { [ShallowRefMarker]?: true } /** * Shallow version of {@link ref()}. * * @example * ```js * const state = shallowRef({ count: 1 }) * * // does NOT trigger change * state.value.count = 2 * * // does trigger change * state.value = { count: 2 } * ``` * * @param value - The "inner value" for the shallow ref. * @see {@link https://vuejs.org/api/reactivity-advanced.html#shallowref} */ export function shallowRef<T>( value: T, ): Ref extends T ? T extends Ref ? IfAny<T, ShallowRef<T>, T> : ShallowRef<T> : ShallowRef<T> export function shallowRef<T = any>(): ShallowRef<T | undefined> export function shallowRef(value?: unknown) { return createRef(value, true) } function createRef(rawValue: unknown, shallow: boolean) { if (isRef(rawValue)) { return rawValue } return new RefImpl(rawValue, shallow) } /** * @internal */ class RefImpl<T = any> { _value: T private _rawValue: T dep: Dep = new Dep() public readonly [ReactiveFlags.IS_REF] = true public readonly [ReactiveFlags.IS_SHALLOW]: boolean = false constructor(value: T, isShallow: boolean) { this._rawValue = isShallow ? value : toRaw(value) this._value = isShallow ? value : toReactive(value) this[ReactiveFlags.IS_SHALLOW] = isShallow } get value() { if (__DEV__) { this.dep.track({ target: this, type: TrackOpTypes.GET, key: 'value', }) } else { this.dep.track() } return this._value } set value(newValue) { const oldValue = this._rawValue const useDirectValue = this[ReactiveFlags.IS_SHALLOW] || isShallow(newValue) || isReadonly(newValue) newValue = useDirectValue ? newValue : toRaw(newValue) if (hasChanged(newValue, oldValue)) { this._rawValue = newValue this._value = useDirectValue ? newValue : toReactive(newValue) if (__DEV__) { this.dep.trigger({ target: this, type: TriggerOpTypes.SET, key: 'value', newValue, oldValue, }) } else { this.dep.trigger() } } } } /** * Force trigger effects that depends on a shallow ref. This is typically used * after making deep mutations to the inner value of a shallow ref. * * @example * ```js * const shallow = shallowRef({ * greet: 'Hello, world' * }) * * // Logs "Hello, world" once for the first run-through * watchEffect(() => { * console.log(shallow.value.greet) * }) * * // This won't trigger the effect because the ref is shallow * shallow.value.greet = 'Hello, universe' * * // Logs "Hello, universe" * triggerRef(shallow) * ``` * * @param ref - The ref whose tied effects shall be executed. * @see {@link https://vuejs.org/api/reactivity-advanced.html#triggerref} */ export function triggerRef(ref: Ref): void { // ref may be an instance of ObjectRefImpl if ((ref as unknown as RefImpl).dep) { if (__DEV__) { ;(ref as unknown as RefImpl).dep.trigger({ target: ref, type: TriggerOpTypes.SET, key: 'value', newValue: (ref as unknown as RefImpl)._value, }) } else { ;(ref as unknown as RefImpl).dep.trigger() } } } export type MaybeRef<T = any> = | T | Ref<T> | ShallowRef<T> | WritableComputedRef<T> export type MaybeRefOrGetter<T = any> = MaybeRef<T> | ComputedRef<T> | (() => T) /** * Returns the inner value if the argument is a ref, otherwise return the * argument itself. This is a sugar function for * `val = isRef(val) ? val.value : val`. * * @example * ```js * function useFoo(x: number | Ref<number>) { * const unwrapped = unref(x) * // unwrapped is guaranteed to be number now * } * ``` * * @param ref - Ref or plain value to be converted into the plain value. * @see {@link https://vuejs.org/api/reactivity-utilities.html#unref} */ export function unref<T>(ref: MaybeRef<T> | ComputedRef<T>): T { return isRef(ref) ? ref.value : ref } /** * Normalizes values / refs / getters to values. * This is similar to {@link unref()}, except that it also normalizes getters. * If the argument is a getter, it will be invoked and its return value will * be returned. * * @example * ```js * toValue(1) // 1 * toValue(ref(1)) // 1 * toValue(() => 1) // 1 * ``` * * @param source - A getter, an existing ref, or a non-function value. * @see {@link https://vuejs.org/api/reactivity-utilities.html#tovalue} */ export function toValue<T>(source: MaybeRefOrGetter<T>): T { return isFunction(source) ? source() : unref(source) } const shallowUnwrapHandlers: ProxyHandler<any> = { get: (target, key, receiver) => key === ReactiveFlags.RAW ? target : unref(Reflect.get(target, key, receiver)), set: (target, key, value, receiver) => { const oldValue = target[key] if (isRef(oldValue) && !isRef(value)) { oldValue.value = value return true } else { return Reflect.set(target, key, value, receiver) } }, } /** * Returns a proxy for the given object that shallowly unwraps properties that * are refs. If the object already is reactive, it's returned as-is. If not, a * new reactive proxy is created. * * @param objectWithRefs - Either an already-reactive object or a simple object * that contains refs. */ export function proxyRefs<T extends object>( objectWithRefs: T, ): ShallowUnwrapRef<T> { return isReactive(objectWithRefs) ? objectWithRefs : new Proxy(objectWithRefs, shallowUnwrapHandlers) } export type CustomRefFactory<T> = ( track: () => void, trigger: () => void, ) => { get: () => T set: (value: T) => void } class CustomRefImpl<T> { public dep: Dep private readonly _get: ReturnType<CustomRefFactory<T>>['get'] private readonly _set: ReturnType<CustomRefFactory<T>>['set'] public readonly [ReactiveFlags.IS_REF] = true public _value: T = undefined! constructor(factory: CustomRefFactory<T>) { const dep = (this.dep = new Dep()) const { get, set } = factory(dep.track.bind(dep), dep.trigger.bind(dep)) this._get = get this._set = set } get value() { return (this._value = this._get()) } set value(newVal) { this._set(newVal) } } /** * Creates a customized ref with explicit control over its dependency tracking * and updates triggering. * * @param factory - The function that receives the `track` and `trigger` callbacks. * @see {@link https://vuejs.org/api/reactivity-advanced.html#customref} */ export function customRef<T>(factory: CustomRefFactory<T>): Ref<T> { return new CustomRefImpl(factory) as any } export type ToRefs<T = any> = { [K in keyof T]: ToRef<T[K]> } /** * Converts a reactive object to a plain object where each property of the * resulting object is a ref pointing to the corresponding property of the * original object. Each individual ref is created using {@link toRef()}. * * @param object - Reactive object to be made into an object of linked refs. * @see {@link https://vuejs.org/api/reactivity-utilities.html#torefs} */ export function toRefs<T extends object>(object: T): ToRefs<T> { if (__DEV__ && !isProxy(object)) { warn(`toRefs() expects a reactive object but received a plain one.`) } const ret: any = isArray(object) ? new Array(object.length) : {} for (const key in object) { ret[key] = propertyToRef(object, key) } return ret } class ObjectRefImpl<T extends object, K extends keyof T> { public readonly [ReactiveFlags.IS_REF] = true public _value: T[K] = undefined! constructor( private readonly _object: T, private readonly _key: K, private readonly _defaultValue?: T[K], ) {} get value() { const val = this._object[this._key] return (this._value = val === undefined ? this._defaultValue! : val) } set value(newVal) { this._object[this._key] = newVal } get dep(): Dep | undefined { return getDepFromReactive(toRaw(this._object), this._key) } } class GetterRefImpl<T> { public readonly [ReactiveFlags.IS_REF] = true public readonly [ReactiveFlags.IS_READONLY] = true public _value: T = undefined! constructor(private readonly _getter: () => T) {} get value() { return (this._value = this._getter()) } } export type ToRef<T> = IfAny<T, Ref<T>, [T] extends [Ref] ? T : Ref<T>> /** * Used to normalize values / refs / getters into refs. * * @example * ```js * // returns existing refs as-is * toRef(existingRef) * * // creates a ref that calls the getter on .value access * toRef(() => props.foo) * * // creates normal refs from non-function values * // equivalent to ref(1) * toRef(1) * ``` * * Can also be used to create a ref for a property on a source reactive object. * The created ref is synced with its source property: mutating the source * property will update the ref, and vice-versa. * * @example * ```js * const state = reactive({ * foo: 1, * bar: 2 * }) * * const fooRef = toRef(state, 'foo') * * // mutating the ref updates the original * fooRef.value++ * console.log(state.foo) // 2 * * // mutating the original also updates the ref * state.foo++ * console.log(fooRef.value) // 3 * ``` * * @param source - A getter, an existing ref, a non-function value, or a * reactive object to create a property ref from. * @param [key] - (optional) Name of the property in the reactive object. * @see {@link https://vuejs.org/api/reactivity-utilities.html#toref} */ export function toRef<T>( value: T, ): T extends () => infer R ? Readonly<Ref<R>> : T extends Ref ? T : Ref<UnwrapRef<T>> export function toRef<T extends object, K extends keyof T>( object: T, key: K, ): ToRef<T[K]> export function toRef<T extends object, K extends keyof T>( object: T, key: K, defaultValue: T[K], ): ToRef<Exclude<T[K], undefined>> export function toRef( source: Record<string, any> | MaybeRef, key?: string, defaultValue?: unknown, ): Ref { if (isRef(source)) { return source } else if (isFunction(source)) { return new GetterRefImpl(source) as any } else if (isObject(source) && arguments.length > 1) { return propertyToRef(source, key!, defaultValue) } else { return ref(source) } } function propertyToRef( source: Record<string, any>, key: string, defaultValue?: unknown, ) { const val = source[key] return isRef(val) ? val : (new ObjectRefImpl(source, key, defaultValue) as any) } /** * This is a special exported interface for other packages to declare * additional types that should bail out for ref unwrapping. For example * \@vue/runtime-dom can declare it like so in its d.ts: * * ``` ts * declare module '@vue/reactivity' { * export interface RefUnwrapBailTypes { * runtimeDOMBailTypes: Node | Window * } * } * ``` */ export interface RefUnwrapBailTypes {} export type ShallowUnwrapRef<T> = { [K in keyof T]: DistributeRef<T[K]> } type DistributeRef<T> = T extends Ref<infer V, unknown> ? V : T export type UnwrapRef<T> = T extends ShallowRef<infer V, unknown> ? V : T extends Ref<infer V, unknown> ? UnwrapRefSimple<V> : UnwrapRefSimple<T> export type UnwrapRefSimple<T> = T extends | Builtin | Ref | RefUnwrapBailTypes[keyof RefUnwrapBailTypes] | { [RawSymbol]?: true } ? T : T extends Map<infer K, infer V> ? Map<K, UnwrapRefSimple<V>> & UnwrapRef<Omit<T, keyof Map<any, any>>> : T extends WeakMap<infer K, infer V> ? WeakMap<K, UnwrapRefSimple<V>> & UnwrapRef<Omit<T, keyof WeakMap<any, any>>> : T extends Set<infer V> ? Set<UnwrapRefSimple<V>> & UnwrapRef<Omit<T, keyof Set<any>>> : T extends WeakSet<infer V> ? WeakSet<UnwrapRefSimple<V>> & UnwrapRef<Omit<T, keyof WeakSet<any>>> : T extends ReadonlyArray<any> ? { [K in keyof T]: UnwrapRefSimple<T[K]> } : T extends object & { [ShallowReactiveMarker]?: never } ? { [P in keyof T]: P extends symbol ? T[P] : UnwrapRef<T[P]> } : T |