/**
 * Base Client
 *
 * Shared HTTP client functionality for all data sources.
 * Provides common patterns for fetch, error handling, and retries.
 */
/**
 * Options for fetch requests
 */
export interface FetchOptions extends RequestInit {
    /** Request timeout in milliseconds */
    timeout?: number;
    /** Number of retry attempts for transient failures */
    retries?: number;
    /** Custom error handler */
    onError?: (error: Error) => void;
    /** Skip default Accept header (for APIs that reject application/json) */
    skipAcceptHeader?: boolean;
}
/**
 * Base client with shared fetch functionality
 */
export declare abstract class BaseClient {
    protected readonly baseUrl: string;
    protected readonly userAgent: string;
    protected readonly defaultTimeout: number;
    constructor(baseUrl: string, options?: {
        userAgent?: string;
        timeout?: number;
    });
    /**
     * Make a JSON fetch request with standard error handling
     */
    protected fetchJSON<T>(url: string, options?: FetchOptions): Promise<T>;
    /**
     * Make a fetch request and return raw response (for header-based pagination)
     */
    protected fetchWithHeaders<T>(url: string, options?: FetchOptions): Promise<{
        data: T;
        headers: Headers;
    }>;
    /**
     * Build URL with query parameters
     */
    protected buildUrl(path: string, params?: Record<string, unknown>): string;
    /**
     * Delay helper for retries
     */
    protected delay(ms: number): Promise<void>;
}
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