import { Message } from '../config/index';
import { ProjectContext } from '../utils/project';
export declare class ApiError extends Error {
    readonly status: number;
    constructor(message: string, status: number);
}
export declare class TimeoutError extends Error {
    constructor(message: string);
}
export declare function setProjectContext(ctx: ProjectContext | null): void;
export declare function chat(message: string, history?: Message[], onChunk?: (chunk: string) => void, onRetry?: (attempt: number) => void, projectContext?: ProjectContext | null, abortSignal?: AbortSignal): Promise<string>;
export declare function validateApiKey(apiKey: string, providerId?: string): Promise<{
    valid: boolean;
    error?: string;
}>;