import type { MailUtilities, MailRenderedContent, MailRendererOptions } from './types.js';
export declare abstract class AbstractMailRenderer {
    /**
     * Render a template.
     *
     * May be async. The `<Tailwind>` component for example suspend while it
     * computes it styles, so it cannot be rendered synchronously at all.
     */
    abstract render(template: unknown, options: MailRendererOptions<unknown>, utilities?: MailUtilities): MailRenderedContent | Promise<MailRenderedContent>;
    abstract internal(): Record<string, unknown>;
}
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