/**
 * Does the html already contain a <tag>…</tag> pair?
 */
export declare const hasTagPair: (html: string, tag: string) => boolean;
/**
 * Ensure <html><head></head><body></body> skeleton exists.
 */
export declare const normaliseSkeleton: (raw: string) => string;
/**
 * Escape characters so they can appear literally inside a RegExp.
 */
export declare const escapeRegExp: (s: string) => string;
/**
 * Inject markup immediately before </head> or </body>.
 */
export declare const injectBeforeClose: (html: string, closing: "</head>" | "</body>", markup: string) => string;
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