export type QueryParams = {
    key: string;
    value: any | any[];
};
export type UnifiedStoredObject = {
    id: string;
} & any;
/**
 * Defines simple indexes (for queries that use a single key)
 */
export type UnifiedStorageIndexes = readonly {
    key: string;
    type: "number" | "string" | "boolean";
    unique: boolean;
    nullable: boolean;
}[];
/**
 * Defines composite indexes (for queries that use multiple keys)
 */
export type UnifiedStorageCompositeIndexes = readonly {
    keys: readonly string[];
    unique: boolean;
}[];
export interface IUnifiedStorage<I extends UnifiedStorageIndexes, C extends UnifiedStorageCompositeIndexes> {
    /**
     * Initializes the storage with given indexes and composite indexes
     * @param indexes
     * @param compositeIndexes
     */
    init(indexes: I, compositeIndexes: C): Promise<void>;
    /**
     * Params are specified in the following way:
     *  - [[condition1, condition2]] - returns all rows where condition1 AND condition2 is met
     *  - [[condition1], [condition2]] - returns all rows where condition1 OR condition2 is met
     *  - [[condition1, condition2], [condition3]] - returns all rows where (condition1 AND condition2) OR condition3 is met
     * @param params
     */
    query(params: Array<Array<QueryParams>>): Promise<Array<UnifiedStoredObject>>;
    save(value: UnifiedStoredObject): Promise<void>;
    saveAll(value: UnifiedStoredObject[]): Promise<void>;
    remove(value: UnifiedStoredObject): Promise<void>;
    removeAll(value: UnifiedStoredObject[]): Promise<void>;
}