import type { Slide } from '../types/slides';
export declare const isDataUrl: (src: string) => boolean;
export declare const isBlobUrl: (src: string) => boolean;
export declare const onMediaInterned: (fn: (from: string, to: string) => void) => () => void;
/** Data URL and its blob: alias are the same bytes. */
export declare const bitmapSrcKeys: (src: string) => string[];
export declare const getInternedBlob: (src: string) => Blob | undefined;
/** Live interned data URL for a blob: src, or the original if it is already persistable. */
export declare const persistableMediaSrc: (src: string) => string;
/**
 * Record an object URL created outside the intern layer (e.g. pasted video)
 * so `getInternedBlob` can still inline its bytes during export.
 */
export declare const registerMediaBlob: (url: string, blob: Blob) => void;
export declare const rewritePersistableMediaSrcs: <T extends Slide>(slides: T[]) => T[];
export declare const startInternSlideMedia: (slide: Slide) => void;
export declare const internMediaSrc: (src: string) => Promise<string>;
export declare const visitSlideMediaSrcs: (slide: Slide, visit: (src: string) => void) => void;
export declare const collectSlideMediaSrcs: (slides: readonly Slide[]) => string[];
export declare const internSlidesMedia: (slides: Slide[]) => Promise<void>;
export declare const resetMediaInternForTests: () => void;