import { AbstractStartedContainer, GenericContainer, StartedTestContainer } from "testcontainers";
/**
 * SpannerEmulatorContainer runs the Cloud Spanner emulator via the GCloud CLI image.
 */
export declare class SpannerEmulatorContainer extends GenericContainer {
    private projectId?;
    constructor(image: string);
    /**
     * Sets the GCP project ID to use with the emulator.
     */
    withProjectId(projectId: string): this;
    start(): Promise<StartedSpannerEmulatorContainer>;
}
/**
 * A running Spanner emulator instance with endpoint getters and helper access.
 */
export declare class StartedSpannerEmulatorContainer extends AbstractStartedContainer {
    private readonly projectId;
    constructor(startedTestContainer: StartedTestContainer, projectId: string);
    /**
     * @returns mapped port for gRPC.
     */
    getGrpcPort(): number;
    /**
     * @returns host:port for gRPC.
     */
    getEmulatorGrpcEndpoint(): string;
    /**
     * @returns the GCP project ID used by the emulator.
     */
    getProjectId(): string;
    /**
     * @returns insecure credentials for emulator.
     */
    getSslCredentials(): import("@grpc/grpc-js").ChannelCredentials;
}