/**
 * Template service — load, parse, and apply user-defined email templates.
 *
 * Templates are stored as TOML files in the XDG config templates directory.
 * Each template has a name, optional description, subject, body, and a list
 * of variable names used for {{variable}} substitution.
 */
import type { EmailTemplate } from '../types/index.js';
export default class TemplateService {
    private templatesDir;
    constructor(templatesDir?: string);
    /**
     * List all templates from the templates directory.
     * Returns metadata only (name, description, variables).
     */
    listTemplates(): Promise<EmailTemplate[]>;
    /**
     * Get a single template by name.
     */
    getTemplate(name: string): Promise<EmailTemplate>;
    /**
     * Apply variable substitution to a template.
     * Returns the composed subject and body with variables replaced.
     * Missing variables are left as {{variable}} placeholders.
     */
    applyTemplate(name: string, variables: Record<string, string>): Promise<{
        subject: string;
        body: string;
        html: boolean;
    }>;
    /** Get the templates directory path. */
    get directory(): string;
}
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