/**
 * Shared HTML-to-text helpers.
 *
 * These produce plain text for JSON/LLM output. They are NOT an HTML sanitizer
 * for rendering sinks: an unterminated `<script` tail or double-encoded
 * entities (e.g. `&amp;lt;`) are not removed. Use a real sanitizer if output
 * is ever rendered as HTML.
 */
export type HtmlWhitespaceMode = "preserve" | "paragraphs" | "collapse";
export interface HtmlToTextOptions {
    /**
     * - `preserve` (default): keep whitespace as-is, only trim ends
     * - `paragraphs`: normalize CRLF to LF and collapse 3+ newlines to 2
     * - `collapse`: collapse all whitespace runs to a single space
     */
    whitespace?: HtmlWhitespaceMode;
}
/**
 * Remove HTML tags, repeating until the string stops changing so nested or
 * overlapping payloads like `<scr<script>ipt>` cannot reassemble into a tag.
 */
export declare function stripTags(input: string): string;
/**
 * Convert an HTML fragment to plain text: strip tags, decode entities, then
 * strip again so encoded markup (`&lt;b&gt;`) revealed by decoding is removed.
 */
export declare function htmlToText(input: unknown, options?: HtmlToTextOptions): string;
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