TypeScript mode

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class Greeter {
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    greeting: string;
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    constructor (message: string) {
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        this.greeting = message;
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    }
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    greet() {
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        return "Hello, " + this.greeting;
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    }
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}
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var greeter = new Greeter("world");
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var button = document.createElement('button')
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button.innerText = "Say Hello"
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button.onclick = function() {
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    alert(greeter.greet())
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}
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document.body.appendChild(button)
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This is a specialization of the JavaScript mode.