import { Metadata } from '@grpc/grpc-js';
/**
 * The SemVer version of the gRPC proto API, independent of the SDK version.
 * Matches `protos/VERSION` and `CanKingServiceInfo.ProtoApiVersion` in the .NET server.
 * @internal
 */
export declare const PROTO_API_VERSION = "2.0.0";
/**
 * Creates gRPC call metadata for the CanKing client.
 *
 * Attach the returned `Metadata` to every gRPC call so the CanKing Service can
 * identify the caller, apply the correct locale, and detect version mismatches.
 *
 * @internal
 *
 * @param version - The version of the CanKing client. Defaults to the version from `package.json` or `'unknown'`.
 * @param language - BCP 47 language tag for the UI locale (e.g. `'en'`, `'sv'`). Defaults to `'en'`.
 * @param useHexNumericBase - Whether to display numeric values in hexadecimal. Defaults to `true`.
 * @returns A {@link Metadata} object populated with standard CanKing client headers.
 */
export declare function createCanKingMetadata(version?: string, language?: string, useHexNumericBase?: boolean): Metadata;