import { Mailable } from '../Mailable.mjs';
import { MailerProvider } from '../MailerProvider.mjs';

/**
 * Configuration options for the SendGridProvider.
 */
type SendGridProviderConfig = {
    /** SendGrid API key */
    api_key: string;
    /** Default sender email address */
    default_from: string;
};
/**
 * Mailer provider that sends emails via SendGrid API.
 * Supports API key from configuration or SENDGRID_API_KEY environment variable.
 */
declare class SendGridProvider implements MailerProvider {
    private defaultFrom;
    private apiKey;
    /**
     * Creates a new SendGridProvider instance.
     * @param options - Provider configuration options
     */
    constructor(options?: Partial<SendGridProviderConfig>);
    /**
     * Sets the default sender email address.
     * @param from - The default sender email address
     */
    setDefaultFrom(from: string): void;
    /**
     * Maps email addresses to SendGrid email objects.
     * @param emails - Array of email addresses
     * @param required - Whether the field is required
     * @returns Array of email objects or undefined if not required and empty
     */
    private mapToEmailObjects;
    /**
     * Sends an email via SendGrid API.
     * @param mail - The email message to send
     * @throws Error if the SendGrid API request fails
     */
    sendMail(mail: Mailable): Promise<void>;
}

export { SendGridProvider, type SendGridProviderConfig };