/**
 * Runway Video Handler (Gen-3 Alpha / Gen-4 Turbo)
 *
 * Async generation: POST /v1/image_to_video → poll /v1/tasks/{id}.
 *
 * @module adapters/video/runwayVideoHandler
 * @see https://docs.dev.runwayml.com/api/
 */
import type { VideoGenerationResult, VideoHandler, VideoOutputOptions } from "../../types/index.js";
/**
 * Runway Video Handler.
 *
 * Auth: `Authorization: Bearer ${RUNWAY_API_KEY}` + `X-Runway-Version`
 * header. Models: gen3a_turbo (Gen-3 Alpha Turbo, default), gen4_turbo.
 */
export declare class RunwayVideoHandler implements VideoHandler {
    readonly maxDurationSeconds = 10;
    readonly supportedAspectRatios: readonly ("16:9" | "9:16")[];
    readonly supportedResolutions: readonly ("720p" | "1080p")[];
    private readonly apiKey;
    private readonly baseUrl;
    private readonly apiVersion;
    constructor(apiKey?: string);
    isConfigured(): boolean;
    generate(image: Buffer, prompt: string, options: VideoOutputOptions): Promise<VideoGenerationResult>;
    private submitTask;
    private pollUntilComplete;
    private downloadVideo;
    private fetchWithTimeout;
    private detectImageType;
    private calculateDimensions;
}