import { MarkedExtension } from 'marked';
/** Labels the injected chrome needs. TuffEx has no i18n; the host supplies wording. */
export interface HardenHtmlLabels {
    blockedImage: string;
    loadOnce: string;
    allowSession: string;
    copyTable: string;
}
export interface HardenHtmlOptions {
    /** When false the policy is bypassed entirely and images render as authored. */
    blockRemoteImages: boolean;
    labels: HardenHtmlLabels;
}
export declare function hardenHtmlExtension(options: () => HardenHtmlOptions): MarkedExtension;