3. Typescript Journey - Hello World

Oct 3, 2022

Run your app with Node

Create src folder
```
 mkdir src
 cd src
```
Create typescript file
```
 touch index.ts
```
Initialize tsc
```
 tsc --init
```
Output “Hello World” to console. Paste code into index.ts
```
 console.log("Hello World")
```
Create .js file from typescript
```
 tsc 
```
Run your app
```
 node index.js
```
Remove .js file
```
 rm index.js
```

Run your app with ts-node

Another alternative to run your app is to use ts-node, this does not require creating a js file

Install ts-node

 npm install -g ts-node typescript '@types/node'

Add ts-node to docker image so you don’t have to install everytime. In your dockerfile add the following line
```
 RUN npm install -g ts-node typescript '@types/node'
```
Run your ts file
```
 ts-node index.ts
```

Next

4. Typescript Journey - Testing