@microsoft/teams.apps/dist/types/plugin/plugin-activity-event.d.ts

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import { Activity, ConversationReference, IToken } from '@microsoft/teams.api';
/**
 * the event emitted by a plugin
 * when an activity is received
 */
export interface IPluginActivityEvent extends ConversationReference {
    /**
     * inbound request token
     */
    readonly token: IToken;
    /**
     * inbound request activity payload
     */
    readonly activity: Activity;
}