/**
 * Email Template Preview API Route Handler for Next.js
 *
 * Renders a template with sample data to preview the interpolated output.
 * Re-export in your Next.js application at /api/email-templates/[id]/preview.
 *
 * @example
 * ```typescript
 * // In your Next.js app: app/api/email-templates/[id]/preview/route.ts
 * export { POST } from 'nextly/api/email-templates-preview';
 * ```
 *
 * The rendered subject/html stay JSON-encoded inside `data` (no raw HTML
 * response; admin renders the preview in an iframe sandbox).
 *
 * @module api/email-templates-preview
 */
interface RouteContext {
    params: Promise<{
        id: string;
    }>;
}
/**
 * POST handler for previewing an email template with sample data.
 *
 * Renders the template by replacing `{{variable}}` placeholders with values
 * from the provided `data` object. Supports dot-notation for nested values
 * (e.g., `{{user.name}}`). HTML-escapes interpolated values by default.
 * Wraps with shared layout (header/footer) when the template has
 * `useLayout: true`.
 *
 * Requires authentication.
 *
 * Request Body:
 * - data: Object with key-value pairs for variable interpolation (required)
 *
 * Response Codes:
 * - 200 OK: Preview rendered successfully
 * - 400 Bad Request: Invalid input
 * - 401 Unauthorized: Authentication required
 * - 404 Not Found: Template with ID does not exist
 * - 500 Internal Server Error: Preview failed
 *
 * Response: `{ "data": { "subject": string, "html": string } }`
 */
declare const POST: (request: Request, context: RouteContext) => Promise<Response>;

export { POST };