/**
 * Gmail-specific IMAP support — Node-free version.
 * OAuth token acquisition is the caller's responsibility.
 * The caller provides a tokenProvider function that returns an access token.
 */
import type { ImapClientConfig, TokenProvider } from "./types.js";
export interface GmailOAuthConfig {
    username: string;
    tokenProvider: TokenProvider;
    verbose?: boolean;
    rejectUnauthorized?: boolean;
    inactivityTimeout?: number;
    fetchChunkSize?: number;
    fetchChunkSizeMax?: number;
    greetingTimeout?: number;
}
/**
 * Check if email address is Gmail
 */
export declare function isGmailUser(username: string): boolean;
/**
 * Check if a server is Gmail
 */
export declare function isGmailServer(server: string): boolean;
/**
 * Create Gmail IMAP config with caller-supplied token provider.
 * The tokenProvider handles OAuth — this function just wires it up.
 */
export declare function createGmailConfig(config: GmailOAuthConfig): ImapClientConfig;
/**
 * Auto-configure IMAP client — detects Gmail and uses OAuth, otherwise uses password.
 * For Gmail, caller must provide a tokenProvider.
 */
export declare function createAutoImapConfig(config: {
    server: string;
    port: number;
    username: string;
    password?: string;
    tokenProvider?: TokenProvider;
    verbose?: boolean;
    rejectUnauthorized?: boolean;
    inactivityTimeout?: number;
    fetchChunkSize?: number;
    fetchChunkSizeMax?: number;
    greetingTimeout?: number;
}): ImapClientConfig;
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