import type { DataFilePreview } from 'openxiangda-contracts/browser';
/** One mounted player owns one transient read. Cancellation prevents late
 * content from creating a URL; every created URL has exactly one disposer. */
export declare function startManagedMediaRead(deps: {
    preview(): Promise<DataFilePreview>;
    content(): Promise<Blob>;
    maxBytes: number;
    createUrl(blob: Blob): string;
    revokeUrl(url: string): void;
    ready(value: {
        src: string;
        preview: DataFilePreview;
    }): void;
    failed(error: unknown): void;
}): {
    completion: Promise<void>;
    dispose(): void;
};
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