/**
 * Constants used throughout the GO Feature Flag API.
 */
export declare const HTTP_HEADER_CONTENT_TYPE = "Content-Type";
export declare const HTTP_HEADER_AUTHORIZATION = "Authorization";
export declare const HTTP_HEADER_IF_NONE_MATCH = "If-None-Match";
export declare const HTTP_HEADER_ETAG = "etag";
export declare const HTTP_HEADER_LAST_MODIFIED = "last-modified";
export declare const APPLICATION_JSON = "application/json";
export declare const BEARER_TOKEN = "Bearer ";
export declare const HTTP_STATUS: {
    readonly OK: 200;
    readonly BAD_REQUEST: 400;
    readonly UNAUTHORIZED: 401;
    readonly FORBIDDEN: 403;
    readonly NOT_FOUND: 404;
    readonly UNAVAILABLE: 503;
    readonly NOT_MODIFIED: 304;
};
export declare const DEFAULT_FLUSH_INTERVAL_MS = 120000;
export declare const DEFAULT_MAX_PENDING_EVENTS = 10000;
export declare const DEFAULT_TARGETING_KEY = "undefined-targetingKey";