Why Does This Typescript Output “[Class] is not a constructor.”?

Question

I\'m working in typescript 1.5 in visual studio. I have a main class called app.ts, and another called FizzBuzzManager.ts. I can\'t figure out what is wrong with this code,

Answer 1

I tried to repeat your problem and I did not find any error:

app.ts

namespace jim {
    class Greeter {
        element: HTMLElement;
        span: HTMLElement;
        timerToken: number;

        constructor() {
            window.console.log("constructing Greeter.");
            this.init();
        }

        private init() {
            window.console.log("Calling init.");
            var _fizzBuzzManager: any = new jim.FizzBuzzManager();
        }

    }

    window.onload = () => {
        window.console.log("Hello")
        var greeter = new Greeter();

    };
}

FizzBuzzManager.ts

namespace jim {

export class FizzBuzzManager {

    constructor() {
        window.console.log("Making a FizzBuzzManager.");
    }

    public myThing: String = "Hi";

    public fizzBuzz2() {
        window.console.log("fizzbuzzing2 " + this.myThing);
    }

}

export function fizzBuzz() {
    window.console.log("export function fizzbuzz");
}

}

Then

c:\Work\TypeScript-playground>node_modules\.bin\tsc --out app.js app.ts FizzBuzzManager.ts

and compiled app.js file looks like this:

var jim;
(function (jim) {
    var Greeter = (function () {
        function Greeter() {
            window.console.log("constructing Greeter.");
            this.init();
        }
        Greeter.prototype.init = function () {
            window.console.log("Calling init.");
            var _fizzBuzzManager = new jim.FizzBuzzManager();
        };
        return Greeter;
    })();
    window.onload = function () {
        window.console.log("Hello");
        var greeter = new Greeter();
    };
})(jim || (jim = {}));
var jim;
(function (jim) {
    var FizzBuzzManager = (function () {
        function FizzBuzzManager() {
            this.myThing = "Hi";
            window.console.log("Making a FizzBuzzManager.");
        }
        FizzBuzzManager.prototype.fizzBuzz2 = function () {
            window.console.log("fizzbuzzing2 " + this.myThing);
        };
        return FizzBuzzManager;
    })();
    jim.FizzBuzzManager = FizzBuzzManager;
    function fizzBuzz() {
        window.console.log("export function fizzbuzz");
    }
    jim.fizzBuzz = fizzBuzz;
})(jim || (jim = {}));

Chrome browser reports in its console:

app.js:15 Hello
app.js:5 constructing Greeter.
app.js:9 Calling init.
app.js:24 Making a FizzBuzzManager.

---

There is a good explanation of the error you are getting here: Javascript: TypeError: ... is not a constructor (not that it reveals the origin of the problem but you may see the problem in your transpiled code.)