export declare class CloudLoggingCredentials {
    private static readonly CRED_OTLP_ENDPOINT;
    private static readonly CRED_OTLP_CLIENT_KEY;
    private static readonly CRED_OTLP_CLIENT_CERT;
    private static readonly CRED_OTLP_SERVER_CERT;
    private static readonly CLOUD_LOGGING_ENDPOINT_PREFIX;
    private diagLogger;
    private endpoint?;
    private clientKey?;
    private clientCert?;
    private serverCert?;
    private constructor();
    static parse(credentials: any): CloudLoggingCredentials;
    validate(): boolean;
    private isUndefinedOrEmpty;
    getEndpoint(): string;
    getClientKey(): Buffer;
    getClientCert(): Buffer;
    getServerCert(): Buffer;
}