/**
 * `tg-html` — transform arbitrary (LLM-emitted) HTML into Telegram-compatible
 * `parse_mode=HTML` with opinionated, consistent spacing.
 *
 * Telegram's HTML subset has no headings, lists, or block layout — send it
 * `<h1>`/`<ul>` and the API rejects the whole message. This module accepts the
 * HTML a model naturally writes and renders the structure typographically:
 *
 *   h1                        → <b><u>…</u></b> + blank line
 *   h2…h6                     → <b>…</b> + blank line
 *   p/div/section/article/…   → content + blank line
 *   ul/ol/li                  → `• ` bullets, blank line after the list
 *   br                        → newline
 *   blockquote                → kept (newlines inside preserved), newline after
 *   b/i/u/s/code/pre/a/…      → kept, attributes filtered to Telegram's allow-list
 *   spoiler / span.tg-spoiler → <tg-spoiler>
 *   unknown letter-tags       → dropped, content kept (hallucinated markup)
 *   stray < >                 → escaped, never eaten
 *
 * Zero dependencies, no DOM: a single-pass tokenizer over a small recursive
 * renderer, safe everywhere (Workers included). Nothing is ever eaten:
 * `x<5 and y>10` escapes rather than vanishing, and an unknown tag drops its
 * markup while keeping its content.
 *
 * @example
 * import { transform } from '@adriangalilea/utils/tg-html'
 *
 * transform('<h1>Title</h1><ul><li>Point</li></ul>')
 * // '<b><u>Title</u></b>\n\n• Point'
 */
/**
 * Escape text or code content for Telegram HTML. The whole escaping
 * contract for both this module and `tg-md`, which renders into the
 * same dialect.
 */
export declare function escapeHtml(s: string): string;
/** Escape a value for a Telegram HTML attribute: text escaping plus quotes. */
export declare function escapeAttr(s: string): string;
/**
 * Transform HTML into Telegram-compatible `parse_mode=HTML` with consistent
 * spacing. Never throws; pathological input degrades to escaped plain text.
 */
export declare function transform(html: string): string;
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