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

In my case I had the problem when I used babel with preset-env to compile TS-sources.

Works:

{
    "presets": ["@babel/typescript"],
    "plugins": [
        "@babel/proposal-class-properties",
        "@babel/proposal-object-rest-spread",
        "@babel/plugin-transform-runtime"
    ],
    "ignore": ["node_modules", "src/test"]
}

Wrong:

{
    "presets": [
        "@babel/typescript",
        [
            "@babel/preset-env",
            {
                "targets": {
                    "browsers": [
                        "last 2 Chrome versions",
                        "last 1 Safari versions",
                        "last 1 Firefox versions"
                    ]
                }
            }
        ]
    ],
    "plugins": [
        "@babel/proposal-class-properties",
        "@babel/proposal-object-rest-spread",
        "@babel/plugin-transform-runtime"
    ],
    "env": {
        "node": {
            "presets": [
                [
                    "@babel/preset-env",
                    {
                        "targets": {
                            "esmodules": true,
                            "node": "current"
                        },
                        "modules": "auto"
                    }
                ]
            ]
        }
    },

    "ignore": ["node_modules", "src/test"]
}