import { Entry, Storage } from '@varasto/storage';
import { Schema } from 'simple-json-match';
import { JsonObject } from 'type-fest';
/**
 * Searches for an entry from given namespace that matches given schema and
 * returns value of first matching result. If no entry in the namespace matches
 * the schema, `undefined` is returned instead.
 */
export declare function find<T extends JsonObject>(storage: Storage, namespace: string, schema: Schema): Promise<T | undefined>;
/**
 * Searches for an entry from given namespace that matches given schema and
 * returns key of first matching result. If no entry in the namespace matches
 * the schema, `undefined` is returned instead.
 */
export declare function findKey(storage: Storage, namespace: string, schema: Schema): Promise<string | undefined>;
/**
 * Searches for an entry from given namespace that matches given schema and
 * returns both key and value of first matching result. If no entry in the
 * namespace matches the schema, `undefined` is returned instead.
 */
export declare function findEntry<T extends JsonObject>(storage: Storage, namespace: string, schema: Schema): Promise<Entry<T> | undefined>;