/**
 * Base interface for API Hub clients
 */
export interface BaseAPIHubClient {
    /**
     * From a given resource name, get the spec in the API Hub.
     * @param resourceName The resource name
     * @returns The spec content as a string
     */
    getSpecContent(resourceName: string): Promise<string>;
}
/**
 * Client for interacting with the API Hub service
 */
export declare class APIHubClient implements BaseAPIHubClient {
    private rootUrl;
    private accessToken;
    private serviceAccount;
    private credentialCache;
    /**
     * Initializes the APIHubClient.
     *
     * You must set either accessToken or serviceAccountJson. This
     * credential is used for sending request to API Hub API.
     *
     * @param params Configuration parameters
     * @param params.accessToken Google Access token. Generate with gcloud cli `gcloud auth print-access-token`. Useful for local testing.
     * @param params.serviceAccountJson The service account configuration as a JSON string. Required if not using default service credential.
     */
    constructor(params: {
        accessToken?: string;
        serviceAccountJson?: string;
    });
    /**
     * From a given path, get the first spec available in the API Hub.
     *
     * - If path includes /apis/apiname, get the first spec of that API
     * - If path includes /apis/apiname/versions/versionname, get the first spec of that API Version
     * - If path includes /apis/apiname/versions/versionname/specs/specname, return that spec
     *
     * Path can be resource name (projects/xxx/locations/us-central1/apis/apiname),
     * and URL from the UI (https://console.cloud.google.com/apigee/api-hub/apis/apiname?project=xxx)
     *
     * @param path The path to the API, API Version, or API Spec.
     * @returns The content of the first spec available in the API Hub.
     */
    getSpecContent(path: string): Promise<string>;
    /**
     * Lists all APIs in the specified project and location.
     *
     * @param project The Google Cloud project name.
     * @param location The location of the API Hub resources (e.g., 'us-central1').
     * @returns A list of API objects, or an empty list if an error occurs.
     */
    listApis(project: string, location: string): Promise<any[]>;
    /**
     * Get API detail by API name.
     *
     * @param apiResourceName Resource name of this API, like projects/xxx/locations/us-central1/apis/apiname
     * @returns An API and details
     */
    getApi(apiResourceName: string): Promise<any>;
    /**
     * Gets details of a specific API version.
     *
     * @param apiVersionName The resource name of the API version.
     * @returns The API version details
     */
    getApiVersion(apiVersionName: string): Promise<any>;
    /**
     * Retrieves the content of a specific API specification.
     *
     * @param apiSpecResourceName The resource name of the API spec.
     * @returns The decoded content of the specification
     * @private
     */
    private fetchSpec;
    /**
     * Extracts the resource names of an API, API Version, and API Spec from a given URL or path.
     *
     * @param urlOrPath The URL (UI or resource) or path string.
     * @returns A tuple containing the API resource name, API version resource name, and API spec resource name.
     * @private
     */
    private extractResourceName;
    /**
     * Gets the access token for service account authentication
     *
     * @returns The access token
     * @private
     */
    private getAccessToken;
    /**
     * Checks if the credential is expired
     *
     * @param credential The credential to check
     * @returns True if expired, false otherwise
     * @private
     */
    private isCredentialExpired;
}