import type { KVStore } from './index.js';
import type { S2CellId } from '../../index.js';
import type { Properties, Value } from '../../index.js';
/**
 * # Key-Value File Store
 *
 * ## Description
 * A filesystem key-value store
 *
 * ## Usage
 * ```ts
 * import { FileKV } from 'gis-tools-ts/file';
 *
 * interface Data { name: string };
 *
 * const kv = new FileKV<Data>('./test.kv');
 * // set a key
 * kv.set(1n, { name: 'test' });
 * // get a key
 * const { name } = kv.get(1n); // { name: 'test' }
 * // check if a key exists
 * kv.has(1n); // true
 * // get length of the store
 * console.log(kv.length); // 1
 *
 * // iterate over the store
 * for await (const value of kv) console.log(value);
 *
 * // close the store
 * kv.close();
 * ```
 */
export declare class FileKV<V = Properties | Value> implements KVStore<V> {
    #private;
    /**
     * Builds a new MultiMap file store
     * @param fileName - the path + file name without the extension
     */
    constructor(fileName?: string);
    /** @returns - the length of the map */
    get length(): number;
    /**
     * Adds a value to the list of values associated with a key
     * @param key - the key
     * @param value - the value to store
     */
    set(key: number | S2CellId, value: V): void;
    /**
     * Check if the key exists
     * @param key - the key
     * @returns true if the key exists
     */
    has(key: number | S2CellId): Promise<boolean>;
    /**
     * Gets the list of values associated with a key
     * @param key - the key
     * @returns the list of values if the map contains values for the key
     */
    get(key: number | S2CellId): Promise<V | undefined>;
    /**
     * iterate through the values
     * @yields {V} - the values iterator
     */
    values(): AsyncGenerator<V>;
    /**
     * iterate through the values
     * @returns an iterator
     */
    [Symbol.asyncIterator](): AsyncGenerator<V>;
    /** Closes the store */
    close(): void;
}
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