@microsoft/teams.apps/dist/routes/invoke/message-extension-submit.d.ts

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import { IMessageExtensionSubmitActionInvokeActivity, InvokeResponse } from '@microsoft/teams.api';
import { IActivityContext } from '../../contexts';
import { RouteHandler } from '../../types';
export type MessageExtensionSubmitActivityRoutes = {
    [K in IMessageExtensionSubmitActionInvokeActivity['value']['botMessagePreviewAction'] as `message.ext.${K}`]?: RouteHandler<IActivityContext<IMessageExtensionSubmitActionInvokeActivity>, InvokeResponse<'composeExtension/submitAction'> | InvokeResponse<'composeExtension/submitAction'>['body']>;
};