import type { Context, Hono } from 'hono';
/** Transactional email sender shared by authentication and route groups. */
export type Sender = {
    /** Console URL embedded in email links. Defaults to the hosted console. */
    consoleUrl?: string | undefined;
    /** Sender address for transactional emails. */
    from: string;
    /** Sends one message. */
    send: (message: Message) => Promise<unknown>;
};
/** One transactional email message. */
export type Message = {
    /** Sender address. */
    from: string;
    /** HTML body. */
    html?: string | undefined;
    /** Subject line. */
    subject: string;
    /** Plain-text body. */
    text: string;
    /** Recipient address. */
    to: string;
};
/** Hono environment variables for transactional email delivery. */
export type Variables = {
    /** Transactional email sender; undefined when dispatch is disabled. */
    email: Sender | undefined;
};
/** Attaches a legacy group-level sender for `App.create` to collect on mount. */
export declare function attach<const app extends Hono<any, any>>(app: app, sender: Sender | undefined): app;
/** Returns the app's transactional email sender, when configured. */
export declare function get<environment extends {
    Variables: Variables;
}>(c: Context<environment>): Sender | undefined;
/** Returns a group-level sender attached for backward compatibility. */
export declare function read(app: Hono<any, any>): Sender | undefined;
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