/**
 * Extends a ref with additional properties.
 *
 * @template { MaybeRefOrGetter | ExtendedRef } [T = undefined]
 * @template [U = T extends ExtendedRef<infer R> ? UnwrapRef<R> : UnwrapRef<T>]
 * @template { Record<PropertyKey, unknown> | null } [Extension = {}]
 * @template { boolean } [Shallow = false]
 * @template { PropertyKey } [Ignore = never]
 * @overload
 * @param { T } [value] Value to normalize into the ref to be extended.
 * @param { Extension } [extension] Extension object whose keys represent
 *   the names or symbols of extendedRef properties to be defined, while
 *   its values represent those properties' initial values or descriptors.
 * @param { ExtendedRefOptions<T extends ExtendedRef<infer R> ? UnwrapRef<R> : UnwrapRef<T>, U, Shallow, Ignore> } [options = {}]
 * @returns {(
 *     T extends ExtendedRef<infer R, infer V, infer S, infer E>
 *         ? ExtendedRef<R, V, S, Extension extends null ? E : Prettify<E & Extension>, Ignore>
 *         : ExtendedRef<T, U, Shallow, Extension extends null ? {} : Extension, Ignore>
 * )}
 */
export function extendedRef<T extends unknown = undefined, U = T extends ExtendedRef<infer R extends unknown> ? UnwrapRef<R> : UnwrapRef<T>, Extension extends Record<PropertyKey, unknown> | null = {}, Shallow extends boolean = false, Ignore extends PropertyKey = never>(value?: T | undefined, extension?: Extension | undefined, options?: ExtendedRefOptions<T extends ExtendedRef<infer R_1 extends unknown> ? UnwrapRef<R_1> : UnwrapRef<T>, U, Shallow, Ignore> | undefined): (T extends ExtendedRef<infer R_2, infer V, infer S, infer E> ? ExtendedRef<R_2, V, S, Extension extends null ? E : Prettify<E & Extension>, Ignore> : ExtendedRef<T, U, Shallow, Extension extends null ? {} : Extension, Ignore>);
/**
 * Assesses whether a value is an extendedRef object.
 *
 * @param { unknown } value
 * @returns { value is ExtendedRef } `true` if `value` is an extendedRef object, and `false` otherwise.
 */
export function isExtendedRef(value: unknown): value is ExtendedRef;
import type { ExtendedRef } from '#reactivity';
import type { UnwrapRef } from 'vue';
import type { ExtendedRefOptions } from '#reactivity';
import type { Prettify } from '#utilities';
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