Preparing Your User Client Environment


  • NodeJS & npm
  • typescript

Preparing your TypeScript environment

  • Make a new directory called simple-service-provider-tutorial containing a directory named user-client:
mkdir -p simple-service-provider/user-client
  • Create a package.json and install dependencies:
cd simple-service-provider/user-client 
npm init  
npm install typescript # allows you to write and use typescript 
npm install ts-node --save-dev # allows you to build a typescript application in a NodeJS environment 
  • Create a tsconfig.json containing the following:
    "compilerOptions": {
        "module": "commonjs",
        "esModuleInterop": true,
        "target": "es6",
        "moduleResolution": "node",
        "sourceMap": true,
        "outDir": "dist"
    "lib": ["es2015"]

Preparing your Bundler

  • We will use the Parcel bundler to build and run our app locally. Parcel also supports hot reloading, making for a nicer developer experience when working on our app. Install it with:
npm install parcel-bundler
  • Create the file structure for our frontend code:
mkdir src 
touch src/index.html src/index.ts

At this point your directory should look like this (check yourself with tree -L 2 simple-service-provider/):

└── user-client
    ├── node_modules
    ├── package.json
    ├── package-lock.json
    ├── src
    └── tsconfig.json

4 directories, 3 files

And user-client/src/ should look like this:

├── index.html
└── index.ts

1 directory, 2 files
  • Time to check everything is working. Paste the following into src/index.html:
<!DOCTYPE html>
        <title>App Test</title>
        <meta charset="utf-8"/>
        <div id="app"></div>
        <script src="index.ts"></script>
  • Paste the following into src/index.ts
console.log('test log')
  • Add the following to package.json in the "scripts" array, above "test":
"start": "parcel src/index.html"
  • npm start should return:
> user-client@1.0.0 start
> parcel src/index.html

Server running at http://localhost:1234
✨  Built in 1.57s.

Open localhost:1234 in your browser. Your web application should be up and running, with Test displayed in the browser window. Checking the console.log output is done by right-clicking on the browser and selecting Inspect, then navigating to the Console section of the resulting panel. You should see the message test log displayed there.

Last change: 2024-04-11, commit: f978552