export interface SanitizeRichtextOptions {
    /** Extra tags to permit, on top of the defaults. */
    allowedTags?: readonly string[];
    /** Extra attributes to permit, on top of the defaults. */
    allowedAttrs?: readonly string[];
}
/**
 * Sanitize a richtext HTML string for rendering.
 *
 * `options` is additive only. Entries in `allowedTags`/`allowedAttrs` are
 * merged on top of the defaults; nothing can remove a default, narrow the
 * link-protocol allowlist, or introduce a tag or attribute that would let
 * stored content run script. Values that would do so are dropped rather than
 * throwing, so a bad option can't take down a published page.
 *
 * @param html Stored richtext HTML.
 * @param options Additive allowlist extensions.
 * @returns Sanitized HTML, safe to pass to `dangerouslySetInnerHTML`.
 */
export declare function sanitizeRichtextHtml(html: string, options?: SanitizeRichtextOptions): string;