@microsoft/teams.apps/dist/routes/activity.d.ts

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import { Activity } from '@microsoft/teams.api';
import { IActivityContext } from '../contexts';
import { RouteHandler } from '../types';
export type ActivityRoutes<TExtraCtx extends Record<string, any> = Record<string, any>> = {
    [K in Activity['type']]?: RouteHandler<IActivityContext<Extract<Activity, {
        type: K;
    }>, TExtraCtx>>;
};