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Typescript is compiled into javascript during the compilation phase. next, you have to execute the node command to run the javascript file.
It involves two steps to execute typescript code
- Compiles typescript to the javascript file
- Executes Javascript file using node command.
node projects using package.json that contains a scripts section to execute npm scripts.
Let’s see an example to run typescript code.
Execute Typescript code using the npm command
There are multiple ways we can execute typescript code
- Plain compile and execute typescript code
First, Create a Nodejs Project using the npm init command as given below
A:\nodejs>npm init
This utility will walk you through creating a package.json file.
It only covers the most common items and tries to guess sensible defaults.
See `npm help init` for definitive documentation on these fields
and exactly what they do.
Use `npm install <pkg>` afterward to install a package and
save it as a dependency in the package.json file.
Press ^C at any time to quit.
package name: (nodejs) tsapp
version: (1.0.0)
description:
entry point: (index.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to A:\nodejs\package.json:
{
"name": "tsapp",
"version": "1.0.0",
"description": "",
"main": "index.js",
"devDependencies": {},
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC"
}
Is this OK? (yes)
This creates a Nodejs Project with default package.json
Create an src folder and write a simple helloworld typescript program
src/helloworld.ts
console.log("Hello World");
Add the scripts to package.json
In Windows and Linux environments, add the following
"scripts": {
"start": "tsc src/helloworld.ts | node src/helloworld.js "
}
In Mac machines,
"scripts": {
"start": "tsc src/helloworld.ts && node src/helloworld.js "
}
tsc is a typescript compiler that converts to javascript.
node is a node command to run a javascript file
The pipe symbol executes commands in sequential execution.
A:\nodejs>npm run run
> [email protected] run
> tsc src/helloworld.ts | node src/helloworld.js
Hello World
