export interface HardenOptions {
    defaultOrigin?: string;
    allowedLinkPrefixes: string[];
    allowedImagePrefixes: string[];
}
export declare const sanitizeUrl: (url: string, prefixes: string[], defaultOrigin?: string) => string | null;
export declare const hardenHref: (href: string, opts: HardenOptions) => string | null;
export declare const hardenSrc: (src: string, opts: HardenOptions) => string | null;