export type FileViewerRtfExternalPolicy = 'allow' | 'block';
export interface FileViewerRtfSanitizeOptions {
    externalLinkPolicy?: FileViewerRtfExternalPolicy;
    externalResourcePolicy?: FileViewerRtfExternalPolicy;
}
/**
 * Canonicalizes an RTF field hyperlink through the same policy used by DOC.
 * Word's `HYPERLINK \\l "bookmark"` field syntax is converted to a fragment
 * before external navigation is considered, so bookmarks remain available
 * even when the default external-link policy is `block`.
 */
export declare const sanitizeFileViewerRtfHyperlink: (value: string, policy?: FileViewerRtfExternalPolicy) => string | null;
export declare const isSafeFileViewerRtfHyperlink: (value: string, policy?: FileViewerRtfExternalPolicy) => boolean;
export declare const createFileViewerRtfHyperlinkContainer: (documentRef: Document, create: () => HTMLElement, hyperlink: {
    url: () => string;
}, policy?: FileViewerRtfExternalPolicy) => {
    element: HTMLSpanElement;
    content: HTMLSpanElement;
};
export declare const sanitizeFileViewerRtfElement: (documentRef: Document, element: HTMLElement, options?: FileViewerRtfSanitizeOptions) => DocumentFragment;
/**
 * Safe serialization boundary for integrations that consume renderer markup
 * directly instead of mounting through the standard File Viewer handler.
 */
export declare const sanitizeFileViewerRtfHtml: (documentRef: Document, markup: string, options?: FileViewerRtfSanitizeOptions) => string;