/**
 * Options for LLM completion generation.
 */
export interface GenerateOptions {
    maxTokens?: number;
    temperature?: number;
    systemPrompt?: string;
}
/**
 * Configuration for creating an LLM provider.
 */
export interface LLMConfig {
    provider: "anthropic" | "openai" | "deepseek" | "gemini" | "none";
    model?: string;
    apiKey?: string;
}
/**
 * LLM provider abstraction for text completion.
 */
export interface LLMProvider {
    /** Generate a completion from a prompt */
    generate(prompt: string, options?: GenerateOptions): Promise<string>;
    /** Get the model name being used */
    model: string;
    /** Provider identifier — used to select rate limiting and concurrency config */
    providerName: string;
    /** Estimate token count for a string (rough approximation) */
    estimateTokens(text: string): number;
}
/**
 * Anthropic Claude provider using the Messages API.
 */
export declare class AnthropicProvider implements LLMProvider {
    private client;
    model: string;
    providerName: string;
    constructor(apiKey: string, model?: string);
    generate(prompt: string, options?: GenerateOptions): Promise<string>;
    estimateTokens(text: string): number;
}
/**
 * Google Gemini provider using the Generative AI SDK.
 * Default model: gemini-2.0-flash (free tier: 15 RPM / 1M tokens/day).
 * Get a free API key at https://ai.google.dev/
 */
export declare class GeminiProvider implements LLMProvider {
    private client;
    model: string;
    providerName: string;
    constructor(apiKey: string, model?: string);
    generate(prompt: string, options?: GenerateOptions): Promise<string>;
    estimateTokens(text: string): number;
}
/**
 * OpenAI provider (GPT-4o-mini default).
 * Get an API key at https://platform.openai.com/
 */
export declare class OpenAIProvider implements LLMProvider {
    private client;
    model: string;
    providerName: string;
    constructor(apiKey: string, model?: string);
    generate(prompt: string, options?: GenerateOptions): Promise<string>;
    estimateTokens(text: string): number;
}
/**
 * DeepSeek provider using the OpenAI-compatible API.
 * Default model: deepseek-chat (DeepSeek-V3).
 * Get an API key at https://platform.deepseek.com/
 * Pricing: ~$0.14/1M input tokens, ~$0.28/1M output tokens (much cheaper than GPT-4).
 */
export declare class DeepSeekProvider implements LLMProvider {
    private client;
    model: string;
    providerName: string;
    constructor(apiKey: string, model?: string);
    generate(prompt: string, options?: GenerateOptions): Promise<string>;
    estimateTokens(text: string): number;
}
/**
 * Create an LLM provider from config or environment variables.
 * Falls back to env: CODEPRISM_LLM_PROVIDER, CODEPRISM_LLM_MODEL, CODEPRISM_LLM_API_KEY.
 *
 * Supported providers:
 *  - deepseek  → DeepSeek-V3 via OpenAI-compatible API (cheap: ~$0.14/1M input tokens)
 *  - gemini    → Google Gemini 2.0 Flash (free tier: https://ai.google.dev/)
 *  - anthropic → Claude (paid)
 *  - openai    → GPT-4o-mini (paid)
 *
 * @returns Provider instance or null if none configured
 */
export declare function createLLMProvider(config?: LLMConfig): LLMProvider | null;
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