ReferenceError: MyClass is not defined about ts-node HOT 3 CLOSED

This is still Node, you need to import or require that file somehow. References in TypeScript are used to tell the compiler this file exists in the current context, but in your case it does not. Try doing:

export class MyClass {
    x: number;
    y: number;
    constructor(x: number, y :number) {
        this.x = x;
        this.y = y;
    }
}

And

import { MyClass } from './MyClass'

var myClass = new MyClass(2,3);
console.log(myClass.x, myClass.y);

from ts-node.

This of course works, much appreciated.

As to expand on my understanding, are you able to explain why in my case the reference doesn't tell the compiler the file exists? Is there an expectation of tsconfig.json here?

from ts-node.

@staff0rd It tells the TypeScript compiler this file exists within scope fine, that works. The error your getting is from node. Just because the TypeScript compiler believes you when you said it was in scope, it doesn't mean it actually is during runtime. Personally, I avoid references since I'm usually developing for CommonJS output. If you want to develop global browser modules, that's where you might use references with TypeScript (or, for global polyfills and .d.ts files, etc).

from ts-node.