import type { Clip, ExportOptions, ExportResult, OutputFormat } from '../types/editor';
type FFmpegLike = {
    load(opts?: {
        coreURL?: string;
        wasmURL?: string;
    }): Promise<void>;
    writeFile(name: string, data: Uint8Array): Promise<void>;
    readFile(name: string): Promise<Uint8Array | string>;
    exec(args: string[]): Promise<number>;
    on(ev: 'log', cb: (e: {
        message: string;
    }) => void): void;
    on(ev: 'progress', cb: (e: {
        progress: number;
    }) => void): void;
};
export interface EnsureFfmpegOptions {
    /** Override the core .js URL (absolute or relative to public/) */
    coreURL?: string;
    /** Override the core .wasm URL */
    wasmURL?: string;
    /** Override the worker .js URL (needed by newer ffmpeg-core builds) */
    workerURL?: string;
    /**
     * Wrap the fetched URLs through `toBlobURL` (default: true). Set to false
     * only if you self-host the core AND have working CORP / same-origin —
     * skipping the wrap saves one fetch round-trip.
     */
    wrapBlobURL?: boolean;
}
/**
 * Return a ready-to-use FFmpeg instance. Lazy-loads the wasm core on first use.
 * Expects cross-origin isolation (COOP/COEP) — caller must configure headers.
 */
export declare function ensureFfmpeg(options?: EnsureFfmpegOptions): Promise<FFmpegLike>;
/**
 * Compose every clip (with its overlays) into a single final file.
 *
 * Pipeline per clip :
 *   video : -ss {srcStart} -to {srcEnd} -i src.webm
 *           -filter_complex "[0:v]setpts=PTS/{speed}{overlays}[v]"
 *           -an -c:v libvpx-vp9 -r {fps} clip_N.webm
 *   image : -loop 1 -t {dur} -i img.png
 *           -filter_complex "[0:v]scale={w}:-2,fps={fps}{overlays}[v]"
 *           -an -c:v libvpx-vp9 clip_N.webm
 *
 * Concat : -f concat -i list.txt -c copy final.webm
 * GIF     : final.webm → palettegen → paletteuse → out.gif
 */
export declare function composeClips(clips: Clip[], options: ExportOptions & {
    ffmpeg?: EnsureFfmpegOptions;
} & {
    blobsByUrl?: Map<string, Blob>;
}): Promise<ExportResult>;
export declare function defaultExportOptions(format?: OutputFormat): ExportOptions;
export {};
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