import type { DataKey, Database } from "../util/data.js";
import type { Item, ItemQuery, Items, OptionalItem } from "../util/item.js";
import type { Updates } from "../util/update.js";
/** Provides access to data (e.g. IndexedDB, Firebase, or in-memory cache providers). */
export interface AbstractProvider<T extends Database> {
    /**
     * Get an item.
     */
    getItem<K extends DataKey<T>>(collection: K, id: string): OptionalItem<T[K]> | PromiseLike<OptionalItem<T[K]>>;
    /**
     * Require an item.
     */
    requireItem<K extends DataKey<T>>(collection: K, id: string): Item<T[K]> | PromiseLike<Item<T[K]>>;
    /**
     * Subscribe to the value of this item with an async iterator.
     */
    getItemSequence<K extends DataKey<T>>(collection: K, id: string): AsyncIterable<OptionalItem<T[K]>>;
    /**
     * Create a new item with a random ID.
     * - Created item is guaranteed to have a unique ID.
     *
     * @param data Complete data to set the item to.
     * @return String ID for the created item (possibly promised).
     */
    addItem<K extends DataKey<T>>(collection: K, data: T[K]): string | PromiseLike<string>;
    /**
     * Set an item.
     *
     * @param data Data to set the item to.
     */
    setItem<K extends DataKey<T>>(collection: K, id: string, data: T[K]): void | PromiseLike<void>;
    /**
     * Update an item.
     * - Should not throw if the item doesn't exist.
     *
     * @param updates Set of property updates to apply to the item.
     */
    updateItem<K extends DataKey<T>>(collection: K, id: string, updates: Updates<T[K]>): void | PromiseLike<void>;
    /**
     * Delete a specified item.
     * - Should not throw if the item doesn't exist.
     */
    deleteItem<K extends DataKey<T>>(collection: K, id: string): void | PromiseLike<void>;
    /**
     * Count number of items in a query.
     *
     * @return Number of items the query matches.
     */
    countQuery<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): number | PromiseLike<number>;
    /**
     * Get all matching items.
     *
     * @return Set of values in `id: data` format.
     */
    getQuery<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): Items<T[K]> | PromiseLike<Items<T[K]>>;
    /**
     * Subscribe to all matching items with an async iterator.
     */
    getQuerySequence<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): AsyncIterable<Items<T[K]>>;
    /**
     * Set the data of all matching items.
     *
     * @param data Data to set matching items to.
     * @return Number of items that were set.
     */
    setQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>, data: T[K]): void | PromiseLike<void>;
    /**
     * Update the data of all matching items.
     *
     * @param updates Set of property updates to apply to matching items.
     * @return Number of items that were updated.
     */
    updateQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>, updates: Updates<T[K]>): void | PromiseLike<void>;
    /**
     * Delete all matching items.
     * @return Number of items that were deleted.
     */
    deleteQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): void | PromiseLike<void>;
    /** Get the first matching item. */
    getFirst<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): OptionalItem<T[K]> | PromiseLike<OptionalItem<T[K]>>;
    /** Require the first matching item. */
    requireFirst<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): Item<T[K]> | PromiseLike<Item<T[K]>>;
}
/** Provider with a fully synchronous interface */
export declare abstract class Provider<T extends Database> implements AbstractProvider<T> {
    abstract getItem<K extends DataKey<T>>(collection: K, id: string): OptionalItem<T[K]>;
    requireItem<K extends DataKey<T>>(collection: K, id: string): Item<T[K]>;
    abstract getItemSequence<K extends DataKey<T>>(collection: K, id: string): AsyncIterable<OptionalItem<T[K]>>;
    abstract addItem<K extends DataKey<T>>(collection: K, data: T[K]): string;
    abstract setItem<K extends DataKey<T>>(collection: K, id: string, data: T[K]): void;
    abstract updateItem<K extends DataKey<T>>(collection: K, id: string, updates: Updates<T[K]>): void;
    abstract deleteItem<K extends DataKey<T>>(collection: K, id: string): void;
    abstract getQuery<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): Items<T[K]>;
    countQuery<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): number;
    abstract getQuerySequence<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): AsyncIterable<Items<T[K]>>;
    abstract setQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>, data: T[K]): void;
    abstract updateQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>, updates: Updates<T[K]>): void;
    abstract deleteQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): void;
    getFirst<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): OptionalItem<T[K]>;
    requireFirst<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): Item<T[K]>;
}
/** Provider with a fully asynchronous interface */
export declare abstract class AsyncProvider<T extends Database> implements AbstractProvider<T> {
    abstract getItem<K extends DataKey<T>>(collection: K, id: string): Promise<OptionalItem<T[K]>>;
    requireItem<K extends DataKey<T>>(collection: K, id: string): Promise<Item<T[K]>>;
    abstract getItemSequence<K extends DataKey<T>>(collection: K, id: string): AsyncIterable<OptionalItem<T[K]>>;
    abstract addItem<K extends DataKey<T>>(collection: K, data: T[K]): Promise<string>;
    abstract setItem<K extends DataKey<T>>(collection: K, id: string, data: T[K]): Promise<void>;
    abstract updateItem<K extends DataKey<T>>(collection: K, id: string, updates: Updates<T[K]>): Promise<void>;
    abstract deleteItem<K extends DataKey<T>>(collection: K, id: string): Promise<void>;
    abstract getQuery<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): Promise<Items<T[K]>>;
    countQuery<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): Promise<number>;
    abstract getQuerySequence<K extends DataKey<T>>(collection: K, query?: ItemQuery<T[K]>): AsyncIterable<Items<T[K]>>;
    abstract setQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>, data: T[K]): Promise<void>;
    abstract updateQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>, updates: Updates<T[K]>): Promise<void>;
    abstract deleteQuery<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): Promise<void>;
    getFirst<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): Promise<OptionalItem<T[K]>>;
    requireFirst<K extends DataKey<T>>(collection: K, query: ItemQuery<T[K]>): Promise<Item<T[K]>>;
}