TypeScript TypeScript with SystemJS Hello World in the browser with SystemJS
Example
Install systemjs and plugin-typescript
npm install systemjs
npm install plugin-typescript
NOTE: this will install typescript 2.0.0 compiler which is not released yet.
For TypeScript 1.8 you have to use plugin-typescript 4.0.16
Create hello.ts file
export function greeter(person: String) {
return 'Hello, ' + person;
}
Create hello.html file
<!doctype html>
<html>
<head>
<title>Hello World in TypeScript</title>
<script src="node_modules/systemjs/dist/system.src.js"></script>
<script src="config.js"></script>
<script>
window.addEventListener('load', function() {
System.import('./hello.ts').then(function(hello) {
document.body.innerHTML = hello.greeter('World');
});
});
</script>
</head>
<body>
</body>
</html>
Create config.js - SystemJS configuration file
System.config({
packages: {
"plugin-typescript": {
"main": "plugin.js"
},
"typescript": {
"main": "lib/typescript.js",
"meta": {
"lib/typescript.js": {
"exports": "ts"
}
}
}
},
map: {
"plugin-typescript": "node_modules/plugin-typescript/lib/",
/* NOTE: this is for npm 3 (node 6) */
/* for npm 2, typescript path will be */
/* node_modules/plugin-typescript/node_modules/typescript */
"typescript": "node_modules/typescript/"
},
transpiler: "plugin-typescript",
meta: {
"./hello.ts": {
format: "esm",
loader: "plugin-typescript"
}
},
typescriptOptions: {
typeCheck: 'strict'
}
});
NOTE: if you don't want type checking, remove loader: "plugin-typescript" and typescriptOptions from config.js. Also note that it will never check javascript code, in particular code in the <script> tag in html example.
Test it
npm install live-server
./node_modules/.bin/live-server --open=hello.html
Build it for production
npm install systemjs-builder
Create build.js file:
var Builder = require('systemjs-builder');
var builder = new Builder();
builder.loadConfig('./config.js').then(function() {
builder.bundle('./hello.ts', './hello.js', {minify: true});
});
build hello.js from hello.ts
node build.js
Use it in production
Just load hello.js with a script tag before first use
hello-production.html file:
<!doctype html>
<html>
<head>
<title>Hello World in TypeScript</title>
<script src="node_modules/systemjs/dist/system.src.js"></script>
<script src="config.js"></script>
<script src="hello.js"></script>
<script>
window.addEventListener('load', function() {
System.import('./hello.ts').then(function(hello) {
document.body.innerHTML = hello.greeter('World');
});
});
</script>
</head>
<body>
</body>
</html>
