/*******
 * Escape only *text* segments in an HTML-ish string, leaving markup intact.
 *
 * This function walks the input and treats characters outside of tag headers
 * (`<...>`) as text nodes. Only those text segments are escaped; everything
 * inside tag headers (tag names + attribute syntax + quoted attribute values)
 * is copied through unchanged.
 *
 * Escaping rules for text segments:
 * - Replaces bare `&` with `&amp;`, but preserves existing entities:
 *   - numeric: `&#123;`, `&#x1F4A9;`
 *   - named:   `&nbsp;`, `&amp;`, etc.
 * - Replaces `<` with `&lt;` and `>` with `&gt;`
 *
 * Tag detection notes:
 * - A `<` begins a tag header only when the next character looks like a tag
 *   starter (letter, `_`, `:`, `!`, `?`, or `/`). This reduces false positives
 *   for text like `1 < 2`.
 * - While inside a tag header, the scanner honors quotes (`"` / `'`) so that
 *   any `>` characters appearing inside quoted attribute values do not end the
 *   tag early.
 *
 * Limitations:
 * - This is not a full HTML parser; it is a conservative text-escape pass for
 *   “mostly-markup” strings.
 * - It does not attempt to understand comments/CDATA beyond the tag-header rule.
 *
 * Intended use:
 * - Pre-escaping user-visible text while preserving already-formed markup and
 *   attribute values (useful for “HTML string assembly” pipelines where you
 *   want to keep tags/attrs verbatim).
 *
 * @param input - An HTML-ish string containing markup and/or text.
 * @returns A string where only text segments are entity-escaped.
 *******/
export declare function escape_text(input: string): string;
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