Getting started with NodeJs,NPM,VsCode,Typescript and webpack

It is a quite reading if you are coming from a .net development experience to work on client side programming , below are few steps which can be used to get started with the modern web development stack .

Basically you would need a Laptop or desktop as usual :) windows or IOS license is all you need 
and then 

1)Code editor : you can use notepad++ , atom , sublime , I personally use VSCode editor (https://code.visualstudio.com/) Its completely freeeeeeeee !!
2)Git : If you need to have a repository and manage versions , you can use VSTS too . (https://git-scm.com/)
3)NodeJs :Platform used to build and test application 
4)NPM : .net developers can compare this to NugetPackage manager .this helps us to download and install the required package which will be used in the web development 
5)Typescript : You can refer this for installation , I would prefer global installation  (https://www.npmjs.com/package/typescript)
6)Task runners: Which will help to automate the development life cycle , there are many Gulp,Grunt,Webpack etc , I have used Webpack in the below sample . The help to automate compilation , bundling of the files even magnification of JS files .

Getting started : 

1)Open VS code
2)cmd (can be any terminal) -- > npm init (Package.json will be created)
3)cmd -->  npm install --save-dev typescript (Creates the local typescript files and a compile component tsc)
4)Create folder to add a  .ts file (custom coding files)
5)Create tsconfig.json and provide entries (Files to be included for transpiling)

for Webpack
1)cmd -- >npm install --save-dev ts-loader (Installs ts loader locally -this helps webpack to compile ts files)
2)cmd --> npm install --save-dev webpack (Installs webpack loacally)
3)Add "webpack.config.js" (This will be used for compiling and build )
4)run "node_modules\.bin\webpack" (provides the output of the build which is a js file which can be directly used in HTML)


Debugging
1)Add line "debugger" in any ts file
2)Open up the html in debug mode , this enters the debug mode but the code is in transpiled state , to get the code in typescript format , perform below steps
3)Open "tsConfig.json" --> add property "ComplierOptions" -->"sourceMap" :true
4)Open "Webpack.config.js --> inside exports add -->devtool: 'source-map',
5)This would load the ts file in the browser


Http-server
1)Cmd -- > Install --save-dev http-server (to install the http server locally)
Auto build through webapcak
2)webpack.config.js --> add property --> watch:true ;
3)To test or run an application in local server use cmd --> node_modules\.bin\http-server

Jquery
1)cmd --> npm install --save jquery (This will install the Jquery package globally- as this package has to be released to browser)
2)run as admin Cmd -- >npm install --save-dev @types/jquery (This will install the Jquery declaration file , this is one of the way to work with Jquery)
3)May get a error on Jquery , if so add the property "lib": ["dom","es5","es2015.iterable"]

4)cmd -- >node_modules\.bin\webpack should give you the bundled file including the Jquery library .

Get started with the project from repository
1) cmd -- > npm install  (This would install all the required package into node modules by referring the package.json)


-------------------------------------------------------------------------------------------------------------------------
tsconfig.json

{

"files": [

"./ts-src/alert.ts"

],

"compilerOptions": {

"lib": [

"dom",

"es5",

"es2015.iterable"

],

"sourceMap": true,

"outDir": "./dist1/",

"noImplicitAny": true,

"module": "commonjs",

"target": "es5",

"jsx": "react",

"allowJs": true

}

}

package.json

{

"name": "typescriptwithjquery",

"version": "1.0.0",

"description": "",

"main": "index.js",

"scripts": {

"test": "echo \"Error: no test specified\" && exit 1"

},

"author": "",

"license": "ISC",

"devDependencies": {

"@types/jquery": "^3.2.12",

"http-server": "^0.10.0",

"ts-loader": "^2.3.7",

"typescript": "^2.5.2",

"webpack": "^3.5.6"

},

"dependencies": {

"jquery": "^3.2.1"

}

}

webpack.config.js

const path = require('path');

module.exports = {

devtool: 'source-map',//only to debug

entry: './ts-src/alert.ts',

module: {

rules: [{

test: /\.tsx?$/,

use: 'ts-loader',

exclude: /node_modules/

}]

},

resolve: {

extensions: [".tsx", ".ts", ".js"]

},

//watch:true,

output: {

filename: 'bundle.js',

path: path.resolve(__dirname, 'dist')

}

};

alert.ts

import news from './sample'

import * as $ from 'jquery'

/*

window.onload = function(){

var a1 = new news();

a1.msg();

}

*/

$(function(){

$('#btn1').on("click",function(){

var a = new news();

a.msg();

});

});

sample.ts

import * as $ from 'jquery'

export default class message{

msg(){

$("#btn1").html('Thilosh');

alert('hi');

}

}

index.html

<html>

<head>

<script src="dist/bundle.js" ></script>

</head>

<body>

<button id="btn1" >click here</button>

</body>

</html>

Note:

--save-dev  will install the packages locally in the loacl project 
-g  will install the package global