/**
 * The picture bytes inside one Escher BLIP record — a raster as it stands, or a
 * metafile unpacked out of its header.
 *
 * @param type     The blip record type (`0xF01A`…`0xF02A`).
 * @param instance The record's `recInstance`, which says how many UIDs precede
 *                 the payload.
 * @param data     The record's body, without the 8-byte header.
 * @returns The bytes to hand the renderer, or `undefined` when the blip holds
 *          nothing this can read.
 */
export declare function readEscherBlip(type: number, instance: number, data: Uint8Array): Uint8Array | undefined;