/**
 * Backend Proxy LLM Provider
 * Calls backend proxy API with authentication
 * Used by VS Extension and GitHub Runner
 */
import { LLMProvider, LLMRequest, LLMResponse } from '../llm-provider';
import { AuthConfig } from '../auth-config';
/**
 * Default LLM provider that calls backend proxy
 * Converts camelCase requests to snake_case for backend API
 */
export declare class BackendProxyLLMProvider implements LLMProvider {
    private authConfig?;
    private backendUrl;
    private logger?;
    constructor(authConfig?: AuthConfig, backendUrl?: string);
    setLogger(logger: (message: string, level?: 'log' | 'error' | 'warn') => void): void;
    callLLM(request: LLMRequest): Promise<LLMResponse>;
    /**
     * Estimate image token cost based on dimensions
     * For gpt-4.1-mini: patches × 1.62, capped at 1536
     */
    private estimateImageTokens;
}
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