import { IfAny } from '@vue/shared';

export declare const enum TrackOpTypes {
    GET = "get",
    HAS = "has",
    ITERATE = "iterate"
}
export declare const enum TriggerOpTypes {
    SET = "set",
    ADD = "add",
    DELETE = "delete",
    CLEAR = "clear"
}

export declare class EffectScope {
    detached: boolean;
    constructor(detached?: boolean);
    get active(): boolean;
    run<T>(fn: () => T): T | undefined;
    stop(fromParent?: boolean): void;
}
/**
 * Creates an effect scope object which can capture the reactive effects (i.e.
 * computed and watchers) created within it so that these effects can be
 * disposed together. For detailed use cases of this API, please consult its
 * corresponding {@link https://github.com/vuejs/rfcs/blob/master/active-rfcs/0041-reactivity-effect-scope.md | RFC}.
 *
 * @param detached - Can be used to create a "detached" effect scope.
 * @see {@link https://vuejs.org/api/reactivity-advanced.html#effectscope}
 */
export declare function effectScope(detached?: boolean): EffectScope;
/**
 * Returns the current active effect scope if there is one.
 *
 * @see {@link https://vuejs.org/api/reactivity-advanced.html#getcurrentscope}
 */
export declare function getCurrentScope(): EffectScope | undefined;
/**
 * Registers a dispose callback on the current active effect scope. The
 * callback will be invoked when the associated effect scope is stopped.
 *
 * @param fn - The callback function to attach to the scope's cleanup.
 * @see {@link https://vuejs.org/api/reactivity-advanced.html#onscopedispose}
 */
export declare function onScopeDispose(fn: () => void): void;

type Dep = Set<ReactiveEffect> & TrackedMarkers;
/**
 * wasTracked and newTracked maintain the status for several levels of effect
 * tracking recursion. One bit per level is used to define whether the dependency
 * was/is tracked.
 */
type TrackedMarkers = {
    /**
     * wasTracked
     */
    w: number;
    /**
     * newTracked
     */
    n: number;
};

export type EffectScheduler = (...args: any[]) => any;
export type DebuggerEvent = {
    effect: ReactiveEffect;
} & DebuggerEventExtraInfo;
export type DebuggerEventExtraInfo = {
    target: object;
    type: TrackOpTypes | TriggerOpTypes;
    key: any;
    newValue?: any;
    oldValue?: any;
    oldTarget?: Map<any, any> | Set<any>;
};
export declare const ITERATE_KEY: unique symbol;
export declare class ReactiveEffect<T = any> {
    fn: () => T;
    scheduler: EffectScheduler | null;
    active: boolean;
    deps: Dep[];
    parent: ReactiveEffect | undefined;
    onStop?: () => void;
    onTrack?: (event: DebuggerEvent) => void;
    onTrigger?: (event: DebuggerEvent) => void;
    constructor(fn: () => T, scheduler?: EffectScheduler | null, scope?: EffectScope);
    run(): T | undefined;
    stop(): void;
}
export interface DebuggerOptions {
    onTrack?: (event: DebuggerEvent) => void;
    onTrigger?: (event: DebuggerEvent) => void;
}
export interface ReactiveEffectOptions extends DebuggerOptions {
    lazy?: boolean;
    scheduler?: EffectScheduler;
    scope?: EffectScope;
    allowRecurse?: boolean;
    onStop?: () => void;
}
export interface ReactiveEffectRunner<T = any> {
    (): T;
    effect: ReactiveEffect;
}
/**
 * Registers the given function to track reactive updates.
 *
 * The given function will be run once immediately. Every time any reactive
 * property that's accessed within it gets updated, the function will run again.
 *
 * @param fn - The function that will track reactive updates.
 * @param options - Allows to control the effect's behaviour.
 * @returns A runner that can be used to control the effect after creation.
 */
export declare function effect<T = any>(fn: () => T, options?: ReactiveEffectOptions): ReactiveEffectRunner;
/**
 * Stops the effect associated with the given runner.
 *
 * @param runner - Association with the effect to stop tracking.
 */
export declare function stop(runner: ReactiveEffectRunner): void;
/**
 * Temporarily pauses tracking.
 */
export declare function pauseTracking(): void;
/**
 * Re-enables effect tracking (if it was paused).
 */
export declare function enableTracking(): void;
/**
 * Resets the previous global effect tracking state.
 */
export declare function resetTracking(): void;
/**
 * Tracks access to a reactive property.
 *
 * This will check which effect is running at the moment and record it as dep
 * which records all effects that depend on the reactive property.
 *
 * @param target - Object holding the reactive property.
 * @param type - Defines the type of access to the reactive property.
 * @param key - Identifier of the reactive property to track.
 */
export declare function track(target: object, type: TrackOpTypes, key: unknown): void;
/**
 * Finds all deps associated with the target (or a specific property) and
 * triggers the effects stored within.
 *
 * @param target - The reactive object.
 * @param type - Defines the type of the operation that needs to trigger effects.
 * @param key - Can be used to target a specific reactive property in the target object.
 */
export declare function trigger(target: object, type: TriggerOpTypes, key?: unknown, newValue?: unknown, oldValue?: unknown, oldTarget?: Map<unknown, unknown> | Set<unknown>): void;

export declare const enum ReactiveFlags {
    SKIP = "__v_skip",
    IS_REACTIVE = "__v_isReactive",
    IS_READONLY = "__v_isReadonly",
    IS_SHALLOW = "__v_isShallow",
    RAW = "__v_raw"
}
export type UnwrapNestedRefs<T> = T extends Ref ? T : UnwrapRefSimple<T>;
/**
 * Returns a reactive proxy of the object.
 *
 * The reactive conversion is "deep": it affects all nested properties. A
 * reactive object also deeply unwraps any properties that are refs while
 * maintaining reactivity.
 *
 * @example
 * ```js
 * const obj = reactive({ count: 0 })
 * ```
 *
 * @param target - The source object.
 * @see {@link https://vuejs.org/api/reactivity-core.html#reactive}
 */
export declare function reactive<T extends object>(target: T): UnwrapNestedRefs<T>;
declare const ShallowReactiveMarker: unique symbol;
export type ShallowReactive<T> = T & {
    [ShallowReactiveMarker]?: true;
};
/**
 * Shallow version of {@link reactive()}.
 *
 * Unlike {@link reactive()}, there is no deep conversion: only root-level
 * properties are reactive for a shallow reactive object. Property values are
 * stored and exposed as-is - this also means properties with ref values will
 * not be automatically unwrapped.
 *
 * @example
 * ```js
 * const state = shallowReactive({
 *   foo: 1,
 *   nested: {
 *     bar: 2
 *   }
 * })
 *
 * // mutating state's own properties is reactive
 * state.foo++
 *
 * // ...but does not convert nested objects
 * isReactive(state.nested) // false
 *
 * // NOT reactive
 * state.nested.bar++
 * ```
 *
 * @param target - The source object.
 * @see {@link https://vuejs.org/api/reactivity-advanced.html#shallowreactive}
 */
export declare function shallowReactive<T extends object>(target: T): ShallowReactive<T>;
type Primitive = string | number | boolean | bigint | symbol | undefined | null;
type Builtin = Primitive | Function | Date | Error | RegExp;
export type DeepReadonly<T> = T extends Builtin ? T : T extends Map<infer K, infer V> ? ReadonlyMap<DeepReadonly<K>, DeepReadonly<V>> : T extends ReadonlyMap<infer K, infer V> ? ReadonlyMap<DeepReadonly<K>, DeepReadonly<V>> : T extends WeakMap<infer K, infer V> ? WeakMap<DeepReadonly<K>, DeepReadonly<V>> : T extends Set<infer U> ? ReadonlySet<DeepReadonly<U>> : T extends ReadonlySet<infer U> ? ReadonlySet<DeepReadonly<U>> : T extends WeakSet<infer U> ? WeakSet<DeepReadonly<U>> : T extends Promise<infer U> ? Promise<DeepReadonly<U>> : T extends Ref<infer U> ? Readonly<Ref<DeepReadonly<U>>> : T extends {} ? {
    readonly [K in keyof T]: DeepReadonly<T[K]>;
} : Readonly<T>;
/**
 * Takes an object (reactive or plain) or a ref and returns a readonly proxy to
 * the original.
 *
 * A readonly proxy is deep: any nested property accessed will be readonly as
 * well. It also has the same ref-unwrapping behavior as {@link reactive()},
 * except the unwrapped values will also be made readonly.
 *
 * @example
 * ```js
 * const original = reactive({ count: 0 })
 *
 * const copy = readonly(original)
 *
 * watchEffect(() => {
 *   // works for reactivity tracking
 *   console.log(copy.count)
 * })
 *
 * // mutating original will trigger watchers relying on the copy
 * original.count++
 *
 * // mutating the copy will fail and result in a warning
 * copy.count++ // warning!
 * ```
 *
 * @param target - The source object.
 * @see {@link https://vuejs.org/api/reactivity-core.html#readonly}
 */
export declare function readonly<T extends object>(target: T): DeepReadonly<UnwrapNestedRefs<T>>;
/**
 * Shallow version of {@link readonly()}.
 *
 * Unlike {@link readonly()}, there is no deep conversion: only root-level
 * properties are made readonly. Property values are stored and exposed as-is -
 * this also means properties with ref values will not be automatically
 * unwrapped.
 *
 * @example
 * ```js
 * const state = shallowReadonly({
 *   foo: 1,
 *   nested: {
 *     bar: 2
 *   }
 * })
 *
 * // mutating state's own properties will fail
 * state.foo++
 *
 * // ...but works on nested objects
 * isReadonly(state.nested) // false
 *
 * // works
 * state.nested.bar++
 * ```
 *
 * @param target - The source object.
 * @see {@link https://vuejs.org/api/reactivity-advanced.html#shallowreadonly}
 */
export declare function shallowReadonly<T extends object>(target: T): Readonly<T>;
/**
 * Checks if an object is a proxy created by {@link reactive()} or
 * {@link shallowReactive()} (or {@link ref()} in some cases).
 *
 * @example
 * ```js
 * isReactive(reactive({}))            // => true
 * isReactive(readonly(reactive({})))  // => true
 * isReactive(ref({}).value)           // => true
 * isReactive(readonly(ref({})).value) // => true
 * isReactive(ref(true))               // => false
 * isReactive(shallowRef({}).value)    // => false
 * isReactive(shallowReactive({}))     // => true
 * ```
 *
 * @param value - The value to check.
 * @see {@link https://vuejs.org/api/reactivity-utilities.html#isreactive}
 */
export declare function isReactive(value: unknown): boolean;
/**
 * Checks whether the passed value is a readonly object. The properties of a
 * readonly object can change, but they can't be assigned directly via the
 * passed object.
 *
 * The proxies created by {@link readonly()} and {@link shallowReadonly()} are
 * both considered readonly, as is a computed ref without a set function.
 *
 * @param value - The value to check.
 * @see {@link https://vuejs.org/api/reactivity-utilities.html#isreadonly}
 */
export declare function isReadonly(value: unknown): boolean;
export declare function isShallow(value: unknown): boolean;
/**
 * Checks if an object is a proxy created by {@link reactive},
 * {@link readonly}, {@link shallowReactive} or {@link shallowReadonly()}.
 *
 * @param value - The value to check.
 * @see {@link https://vuejs.org/api/reactivity-utilities.html#isproxy}
 */
export declare function isProxy(value: unknown): boolean;
/**
 * Returns the raw, original object of a Vue-created proxy.
 *
 * `toRaw()` can return the original object from proxies created by
 * {@link reactive()}, {@link readonly()}, {@link shallowReactive()} or
 * {@link shallowReadonly()}.
 *
 * This is an escape hatch that can be used to temporarily read without
 * incurring proxy access / tracking overhead or write without triggering
 * changes. It is **not** recommended to hold a persistent reference to the
 * original object. Use with caution.
 *
 * @example
 * ```js
 * const foo = {}
 * const reactiveFoo = reactive(foo)
 *
 * console.log(toRaw(reactiveFoo) === foo) // true
 * ```
 *
 * @param observed - The object for which the "raw" value is requested.
 * @see {@link https://vuejs.org/api/reactivity-advanced.html#toraw}
 */
export declare function toRaw<T>(observed: T): T;
export type Raw<T> = T & {
    [RawSymbol]?: true;
};
/**
 * Marks an object so that it will never be converted to a proxy. Returns the
 * object itself.
 *
 * @example
 * ```js
 * const foo = markRaw({})
 * console.log(isReactive(reactive(foo))) // false
 *
 * // also works when nested inside other reactive objects
 * const bar = reactive({ foo })
 * console.log(isReactive(bar.foo)) // false
 * ```
 *
 * **Warning:** `markRaw()` together with the shallow APIs such as
 * {@link shallowReactive()} allow you to selectively opt-out of the default
 * deep reactive/readonly conversion and embed raw, non-proxied objects in your
 * state graph.
 *
 * @param value - The object to be marked as "raw".
 * @see {@link https://vuejs.org/api/reactivity-advanced.html#markraw}
 */
export declare function markRaw<T extends object>(value: T): Raw<T>;

declare const ComputedRefSymbol: unique symbol;
export interface ComputedRef<T = any> extends WritableComputedRef<T> {
    readonly value: T;
    [ComputedRefSymbol]: true;
}
export interface WritableComputedRef<T> extends Ref<T> {
    readonly effect: ReactiveEffect<T>;
}
export type ComputedGetter<T> = (...args: any[]) => T;
export type ComputedSetter<T> = (v: T) => void;
export interface WritableComputedOptions<T> {
    get: ComputedGetter<T>;
    set: ComputedSetter<T>;
}
/**
 * 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 declare function computed<T>(getter: ComputedGetter<T>, debugOptions?: DebuggerOptions): ComputedRef<T>;
export declare function computed<T>(options: WritableComputedOptions<T>, debugOptions?: DebuggerOptions): WritableComputedRef<T>;

declare const RefSymbol: unique symbol;
declare const RawSymbol: unique symbol;
export interface Ref<T = any> {
    value: T;
    /**
     * Type differentiator only.
     * We need this to be in public d.ts but don't want it to show up in IDE
     * autocomplete, so we use a private Symbol instead.
     */
    [RefSymbol]: true;
}
/**
 * Checks if a value is a ref object.
 *
 * @param r - The value to inspect.
 * @see {@link https://vuejs.org/api/reactivity-utilities.html#isref}
 */
export declare function isRef<T>(r: Ref<T> | unknown): r is Ref<T>;
/**
 * Takes an inner value and returns a reactive and mutable ref object, which
 * has a single property `.value` that points to the inner value.
 *
 * @param value - The object to wrap in the ref.
 * @see {@link https://vuejs.org/api/reactivity-core.html#ref}
 */
export declare function ref<T>(value: T): Ref<UnwrapRef<T>>;
export declare function ref<T = any>(): Ref<T | undefined>;
declare const ShallowRefMarker: unique symbol;
export type ShallowRef<T = any> = Ref<T> & {
    [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 declare function shallowRef<T>(value: T): Ref extends T ? T extends Ref ? IfAny<T, ShallowRef<T>, T> : ShallowRef<T> : ShallowRef<T>;
export declare function shallowRef<T = any>(): ShallowRef<T | undefined>;
/**
 * 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 declare function triggerRef(ref: Ref): void;
export type MaybeRef<T = any> = T | Ref<T>;
export type MaybeRefOrGetter<T = any> = MaybeRef<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 declare function unref<T>(ref: MaybeRef<T> | ComputedRef<T>): T;
/**
 * 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 declare function toValue<T>(source: MaybeRefOrGetter<T> | ComputedRef<T>): T;
/**
 * Returns a reactive proxy for the given object.
 *
 * If the object already is reactive, it's returned as-is. If not, a new
 * reactive proxy is created. Direct child properties that are refs are properly
 * handled, as well.
 *
 * @param objectWithRefs - Either an already-reactive object or a simple object
 * that contains refs.
 */
export declare function proxyRefs<T extends object>(objectWithRefs: T): ShallowUnwrapRef<T>;
export type CustomRefFactory<T> = (track: () => void, trigger: () => void) => {
    get: () => T;
    set: (value: T) => void;
};
/**
 * 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 declare function customRef<T>(factory: CustomRefFactory<T>): Ref<T>;
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 declare function toRefs<T extends object>(object: T): ToRefs<T>;
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 declare function toRef<T>(value: T): T extends () => infer R ? Readonly<Ref<R>> : T extends Ref ? T : Ref<UnwrapRef<T>>;
export declare function toRef<T extends object, K extends keyof T>(object: T, key: K): ToRef<T[K]>;
export declare function toRef<T extends object, K extends keyof T>(object: T, key: K, defaultValue: T[K]): ToRef<Exclude<T[K], undefined>>;
type BaseTypes = string | number | boolean;
/**
 * 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]: T[K] extends Ref<infer V> ? V : T[K] extends Ref<infer V> | undefined ? unknown extends V ? undefined : V | undefined : T[K];
};
export type UnwrapRef<T> = T extends ShallowRef<infer V> ? V : T extends Ref<infer V> ? UnwrapRefSimple<V> : UnwrapRefSimple<T>;
type UnwrapRefSimple<T> = T extends Function | BaseTypes | 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;

export declare function deferredComputed<T>(getter: () => T): ComputedRef<T>;