import { type Credentials, type EventData, type JSONEventData } from "@kurrent/kurrentdb-client";
export declare function hasConvertGrpcEventMethod(obj: any): obj is {
    convertGrpcEvent: Function;
};
export declare function isJSONEventData(event: EventData): event is JSONEventData;
export type AuthKind = "basic" | "bearer" | "provider";
export type AuthContext = {
    username?: string;
    kind?: AuthKind;
};
/**
 * Derive the auth-related span attributes from the per-call credentials and
 * whether a {@link CredentialsProvider} is configured. Narrows the credential
 * shape once so `username` is only ever set alongside `kind: "basic"`.
 */
export declare const describeAuth: (credentials: Credentials | undefined, hasProvider: boolean) => AuthContext;