/**
 * MIME types a browser renders directly, so their bytes can become a preview src.
 * Everything else an IDML may place — TIFF, PSD (both arrive as graphicType
 * 'Image'), and the vector formats PDF/EPS/WMF — must be rasterized by bx-files
 * first, so it stays a placeholder in the serial and only rides the upload path.
 */
export declare const DISPLAYABLE_IMAGE_MIMES: ReadonlySet<string>;
export declare function isDisplayableImageMime(mime: string | undefined): boolean;
/**
 * A browser-displayable preview URL for image `bytes` of the given `mime`, or
 * `undefined` if the MIME isn't browser-renderable (caller keeps the placeholder).
 *
 * Browser: raster bytes are downscaled + recompressed with compressorjs (the same
 * knobs bx-studio uses — a real wizard re-compresses at upload, an accepted double)
 * into a blob URL; SVG passes through as a blob unchanged (rasterizing it would be
 * wrong). Node: no canvas, so a `data:` URL of the raw bytes (preview isn't the
 * point headless). Blob URLs are session-scoped — a persisting consumer must swap
 * them for durable URLs before saving the serial.
 */
export declare function makeImagePreviewSrc(bytes: ArrayBuffer, mime: string): Promise<string | undefined>;
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