import type { PluginRuntime } from "openclaw/plugin-sdk/core";
export type EmailPluginRuntime = {
    channel: {
        email: {
            sendMessage: (to: string, text: string, options?: {
                accountId?: string;
                subject?: string;
                inReplyTo?: string;
                references?: string[];
                attachments?: Array<{
                    filename: string;
                    content: Buffer;
                }>;
            }) => Promise<{
                messageId?: string;
                ok: boolean;
                error?: string;
            }>;
        };
    };
};
/**
 * Sets the global Email runtime (called from plugin register).
 */
export declare function setEmailRuntime(runtime: PluginRuntime): void;
/**
 * Gets the global Email runtime (throws if not initialized).
 */
export declare function getEmailRuntime(): PluginRuntime;
/**
 * Waits for the Email runtime to be initialized (async polling).
 */
export declare function waitForEmailRuntime(timeoutMs?: number): Promise<PluginRuntime>;
/**
 * Resolves `PluginRuntime["channel"]` for the email monitor.
 *
 * Prefer the gateway-injected `channelRuntime` on `ChannelGatewayContext` when present (avoids
 * races with the module-global from `register()`). Fall back to the global set by `setEmailRuntime()`,
 * then to a short wait for legacy hosts.
 */
export declare function resolveEmailChannelRuntime(params: {
    channelRuntime?: PluginRuntime["channel"];
    waitTimeoutMs?: number;
}): Promise<PluginRuntime["channel"]>;