@microsoft/teams.apps/dist/router/route.d.ts

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import { Activity } from '@microsoft/teams.api';
import { IRoutes } from '../routes';
export type RouteType = 'system' | 'user';
export type Route<Name extends keyof IRoutes = keyof IRoutes, TExtraCtx extends Record<string, any> = Record<string, any>> = {
    readonly name?: Name;
    readonly type: 'system' | 'user';
    readonly select: (activity: Activity) => boolean;
    readonly callback: IRoutes<TExtraCtx>[Name];
};