Error message: Uncaught ReferenceError: require is not defined in Typescript and KnockoutJs combination

Presently, I am exploring the ts-ko demo provided by TypeScript. When I directly reference Ko like this:

/// <reference path="./node_modules/@types/knockout/index.d.ts" /> 

No errors occur. However, if I add a reference in this manner:

import * as ko from "knockout";

An error is generated:

Uncaught ReferenceError: require is not defined

The Typescript demo mentions that:

We’ll need to grab Knockout itself, as well as something called RequireJS.

What is the correct way to define RequireJs? And why is it necessary to use requirejs for the "import" scenario?

Here is a snippet from package.json:

  "dependencies": {
    "jquery": "3.1.1",
    "@types/jquery": "2.0.33",
    "knockout": "3.4.0",
    "@types/knockout": "1.1.5"
  }

Answer №1

From the official RequireJs website, you can learn more about RequireJS, a JavaScript file and module loader.

How should one properly define RequireJs?

The correct way to define RequireJs is by simply referencing it from a script tag.

<script src="scripts/require.js" type="text/javascript"></script>

Don't forget to configure your requireJs settings as well.

require.config({
    baseUrl: 'app',
    paths: {
        text: "../scripts/text",
        widgets: "widgets",
        app: "."
    }
});

Once configured, you can register your components like this example.

ko.components.register(name, {
    viewModel: { require: path },
    template: { require: 'text!'+ path +'.html' }
});

Why is requirejs necessary for "import" scenarios?

Using a module loader like RequireJs is essential for loading knockout components asynchronously. You can find more information in the Knockout documentation.

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