How to Import JQuery into a Typescript File?

In this post, I would suggest two ways to import the JQuery library into a TypeScript file.

Approach 1

If you have included jquery library somewhere in your project then below the line of code shows how to imported jquery in TypeScript file:
import { $ } from '../jquery-3.1.1';

Approach 2

You can install jquery using npm and then import into a TypeScript file like this:
First, install jquery using the following command:
npm install @types/jquery --save-dev
Now, import jquery into import into a TypeScript file:
import * as $ from 'jquery';
Example: This approach worked for me and here is the sample usage of this:
import * as $ from 'jquery';

export class Login {

    static readonly PARAM_USERNAME = "j_username";
    static readonly PARAM_PASSWORD = "j_password";

    login(loginId, password, sdkURL) {
        let data = {
            PARAM_USERNAME: loginId,
            PARAM_PASSWORD: password

    logout(loginId) {

    private loginService(data: any) {
        console.log("inside ajax - data :: " + data);
            method: 'POST',
            url: 'URL Here',
            data: data,
            async: false,
            contentType: "application/x-www-form-urlencoded",
            dataType: "json",
            success: function (response) {

            error: function (response, status, error) {