import type { ClientType, DistributionType, EnvironmentType, ServiceResponse } from "../remote-feature-flag-controller-types.cjs";
export declare const DEFAULT_DEGRADED_THRESHOLD = 5000;
/**
 * This service is responsible for fetching feature flags from the ClientConfig API.
 */
export declare class ClientConfigApiService {
    #private;
    /**
     * Constructs a new ClientConfigApiService object.
     *
     * @param args - The arguments.
     * @param args.fetch - A function that can be used to make an HTTP request.
     * @param args.retries - Number of retry attempts for each fetch request.
     * @param args.maximumConsecutiveFailures - The maximum number of consecutive failures
     * allowed before breaking the circuit and pausing further fetch attempts.
     * @param args.circuitBreakDuration - The duration for which the circuit remains open after
     * too many consecutive failures.
     * @param args.onBreak - Callback invoked when the circuit breaks.
     * @param args.onDegraded - Callback invoked when the service is degraded (requests resolving too slowly).
     * @param args.config - The configuration object, includes client, distribution, and environment.
     * @param args.config.client - The client type (e.g., 'extension', 'mobile').
     * @param args.config.distribution - The distribution type (e.g., 'main', 'flask').
     * @param args.config.environment - The environment type (e.g., 'prod', 'rc', 'dev').
     */
    constructor({ fetch: fetchFunction, retries, maximumConsecutiveFailures, circuitBreakDuration, onBreak, onDegraded, config, }: {
        fetch: typeof fetch;
        retries?: number;
        maximumConsecutiveFailures?: number;
        circuitBreakDuration?: number;
        onBreak?: () => void;
        onDegraded?: () => void;
        config: {
            client: ClientType;
            distribution: DistributionType;
            environment: EnvironmentType;
        };
    });
    /**
     * Fetches feature flags from the API with specific client, distribution, and environment parameters.
     * Provides structured error handling, including fallback to cached data if available.
     * @returns An object of feature flags and their boolean values or a structured error object.
     */
    fetchRemoteFeatureFlags(): Promise<ServiceResponse>;
    /**
     * Flattens an array of feature flag objects into a single feature flags object.
     * @param responseData - Array of objects containing feature flag key-value pairs
     * @returns A single object containing all feature flags merged together
     * @example
     * // Input: [{ flag1: true }, { flag2: [] }]
     * // Output: { flag1: true, flag2: [] }
     */
    private flattenFeatureFlags;
}
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