/**
 * Rewrites collab marks to names Milkdown toolbar/commands expect, plus Platform persist names.
 * Italic: `em` (legacy Y.js) → `emphasis` (Crepe). Do not rewrite `emphasis` → `em`.
 * Inline code / strikethrough still persist as Platform names.
 * Register only when collaboration is enabled.
 */
export declare const platformPersistMarkNormalizer: import('@milkdown/utils').$Prose;