export declare const MAX_PREVIEW_WIDTH = 1024;
export declare const MAX_PREVIEW_HEIGHT = 1024;
export declare const MAX_PREVIEW_BYTES: number;
export interface GeneratedImagePreview {
    bytes: Uint8Array;
    mimeType: "image/png" | "image/jpeg";
    width: number;
    height: number;
}
export interface ImagePreviewGenerator {
    generate(bytes: Uint8Array, mimeType: string): Promise<GeneratedImagePreview>;
    close(): Promise<void>;
}
/** One worker keeps Photon decode/resize work off the ordered SSE path. */
export declare class ImagePreviewWorker implements ImagePreviewGenerator {
    /** Injectable worker URL keeps abnormal-exit handling deterministic in tests. */
    private readonly workerUrl;
    private worker;
    private nextId;
    private closed;
    private readonly pending;
    constructor(
    /** Injectable worker URL keeps abnormal-exit handling deterministic in tests. */
    workerUrl?: import("url").URL);
    generate(bytes: Uint8Array, mimeType: string): Promise<GeneratedImagePreview>;
    close(): Promise<void>;
    private getWorker;
}
//# sourceMappingURL=image-preview.d.ts.map