/**
 * HTML transform -- resolves `data-czap="name"` to boundary JSON.
 *
 * Scans HTML/Astro source for `data-czap="..."` attributes, resolves
 * the named boundary via the existing boundary resolution infrastructure,
 * and replaces with `data-czap-boundary='...'` containing serialized JSON.
 *
 * @module
 */
/**
 * Transform HTML source, replacing `data-czap="name"` with resolved boundary JSON.
 *
 * @param source - The HTML/Astro source string
 * @param fromFile - The file path of the source (for resolution context)
 * @param projectRoot - The project root directory
 * @param boundaryDir - Optional boundary definition directory (the plugin's `dirs.boundary` override)
 * @returns The transformed source, or the original if no transforms needed
 */
export declare function transformHTML(source: string, fromFile: string, projectRoot: string, boundaryDir?: string): Promise<string>;
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