/**
 * In-place image patching for the editor's incremental reconcile.
 *
 * When a block's fresh render differs from its live DOM node only in the attributes
 * of `<img>` elements — a host replacing an image's media through the session, most
 * visibly the arcade's Doom cartridge writing a new framebuffer PNG every frame —
 * the reconciler must NOT swap the node. Firefox and WebKit paint a freshly inserted
 * `<img>` as an empty box until its (data-URI) source is decoded, so a per-frame swap
 * strobes white between frames. Changing `src` on the element that is already on
 * screen keeps the previous bitmap visible until the new one is ready, in every
 * engine.
 *
 * Both functions are deliberately self-contained (no module-level state, no imports)
 * so a browser test can inject them into a page with `Function.prototype.toString`.
 */
/** Attributes the editor stamps on live blocks after rendering; a fresh render never
 *  carries them, so they are not a difference. Mirrors `DocxEditor.wireBlock`. Each
 *  function repeats the list inline rather than defaulting to this constant so that
 *  its source, injected into a page on its own, has no free variable. */
export declare const EDITOR_OWNED_ATTRIBUTES: readonly string[];
/**
 * The `[live, fresh]` `<img>` pairs when `live` and `fresh` are the same tree apart
 * from `<img>` attributes; `null` when anything else differs (tag, text, any other
 * attribute, child count), in which case the caller must swap nodes as before.
 *
 * Editor-owned attributes on the live side are ignored, as is the list-marker
 * separator element the editor injects into list blocks. Everything else must match
 * exactly — the patch is only ever taken when it is provably equivalent to a swap.
 */
export declare function imageOnlyDelta(live: Element, fresh: Element, ignoredAttributes?: readonly string[]): Array<[HTMLImageElement, HTMLImageElement]> | null;
/**
 * Make `live` carry exactly `fresh`'s attributes, touching only what changed and
 * keeping the editor-owned stamps. `src` is set last, after any new dimensions, so
 * the box is already the right size when the new source starts loading. An unchanged
 * `src` is left alone — re-setting it would restart the load for nothing.
 */
export declare function patchImageAttributes(live: HTMLImageElement, fresh: HTMLImageElement, ignoredAttributes?: readonly string[]): void;
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