/*******
 * Expand boolean/flag-style attributes into explicit key="key" values.
 *
 * Behavior:
 * - Scans only tag headers (`<tag ...>` and `<tag ... />`).
 * - For attributes without a value (e.g. `disabled`), rewrites them to
 *   `disabled="disabled"`.
 * - Attributes that already have values are left unchanged.
 * - End tags, comments, and doctypes are not modified.
 *
 * This keeps downstream XML-ish parsers happy by ensuring attributes always
 * have an explicit value while preserving HTML boolean semantics.
 *
 * @param input - Markup string containing tag attributes.
 * @returns Markup with flag-style attributes expanded to key="key".
 *******/
export declare function expand_flags(input: string): string;
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