TS React: Unexpected token - asp.net

Question

I am using asp.net core and React.js for an application.Everything is happeing in visual studio. I am trying to create a schedule but I have an error when I use 'let ajax = new Ajax('Home/GetData', 'GET', false); '. The error:
Unexpected token. a constructor method accessor or property was
expected
Scheduler.tsx
import * as React from 'react';
import { ScheduleComponent, Day, Week, WorkWeek, Month, Agenda, Inject } from '#syncfusion/ej2-react-schedule';
import { RouteComponentProps, withRouter } from 'react-router';
import { connect } from 'react-redux';
import { Ajax } from '#syncfusion/ej2-base';
import { DataManager, ODataV4Adaptor, Query } from '#syncfusion/ej2-data';
export default class Scheduler extends React.Component<RouteComponentProps<{}>, {}> {
private dataManager: object = [];
let ajax = new Ajax('Home/GetData', 'GET', false); //here
render() {
<h1>nerge</h1>
return <ScheduleComponent height='550px' selectedDate={new Date(2018, 1, 15)} eventSettings={{ dataSource: dataManager }}>
<Inject services={[Day, Week, WorkWeek, Month]} />
</ScheduleComponent>;
}
}
package.json
{
"name": "WebApplication",
"private": true,
"version": "0.0.0",
"devDependencies": {
"#types/history": "4.6.0",
"#types/react": "15.0.35",
"#types/react-dom": "15.5.1",
"#types/react-hot-loader": "3.0.3",
"#types/react-redux": "4.4.45",
"#types/react-router": "4.0.12",
"#types/react-router-dom": "4.0.5",
"#types/react-router-redux": "5.0.3",
"#types/webpack": "2.2.15",
"#types/webpack-env": "1.13.0",
"aspnet-prerendering": "^3.0.1",
"aspnet-webpack": "^2.0.1",
"aspnet-webpack-react": "^3.0.0",
"awesome-typescript-loader": "3.2.1",
"bootstrap": "3.3.7",
"css-loader": "0.28.4",
"domain-task": "^3.0.3",
"event-source-polyfill": "0.0.9",
"extract-text-webpack-plugin": "2.1.2",
"file-loader": "0.11.2",
"history": "4.6.3",
"jquery": "3.2.1",
"node-noop": "1.0.0",
"react": "15.6.1",
"react-dom": "15.6.1",
"react-hot-loader": "3.0.0-beta.7",
"react-redux": "5.0.5",
"react-router-dom": "4.1.1",
"react-router-redux": "5.0.0-alpha.6",
"redux": "3.7.1",
"redux-thunk": "2.2.0",
"style-loader": "0.18.2",
"typescript": "2.4.1",
"url-loader": "0.5.9",
"webpack": "2.5.1",
"webpack-hot-middleware": "2.18.2",
"webpack-merge": "4.1.0"
},
"dependencies": {
"#syncfusion/ej2-react-schedule": "^18.1.44"
}
}
How can I solve this problem? Thank you.