import type { Spanner } from "@google-cloud/spanner";
import type { IInstance } from "@google-cloud/spanner/build/src/instance";
import type { StartedSpannerEmulatorContainer } from "./spanner-emulator-container";
/**
 * Helper class that encapsulates all Spanner client interactions against the emulator.
 * Clients and configs are lazily instantiated.
 */
export declare class SpannerEmulatorHelper {
    private readonly emulator;
    private clientInstance?;
    private instanceAdminClientInstance?;
    private databaseAdminClientInstance?;
    private instanceConfigValue?;
    constructor(emulator: StartedSpannerEmulatorContainer);
    /**
     * Lazily get or create the Spanner client.
     */
    client(): Promise<Spanner>;
    /**
     * Lazily get or create the InstanceAdminClient.
     */
    private instanceAdminClient;
    /**
     * Lazily get or create the DatabaseAdminClient.
     */
    private databaseAdminClient;
    /**
     * Lazily compute the instanceConfig path.
     */
    instanceConfig(): Promise<string>;
    /**
     * Creates a new Spanner instance in the emulator.
     */
    createInstance(instanceId: string, options?: IInstance): Promise<unknown>;
    /**
     * Deletes an existing Spanner instance in the emulator.
     */
    deleteInstance(instanceId: string): Promise<void>;
    /**
     * Creates a new database under the specified instance in the emulator.
     */
    createDatabase(instanceId: string, databaseId: string): Promise<unknown>;
    /**
     * Deletes a database under the specified instance in the emulator.
     */
    deleteDatabase(instanceId: string, databaseId: string): Promise<void>;
}