Remove the export statement after transpiling TypeScript to JavaScript

I am new to using TypeScript. I have a project with Knockout TS, and after compiling it (using the Intellij plugin to automatically compile ts to js),

this is my sample.ts file:

import * as ko from "knockout"; ko;

class HelloViewModel {
    language: KnockoutObservable<string>
    framework: KnockoutObservable<string>

    constructor(language: string, framework: string) {
        this.language = ko.observable(language);
        this.framework = ko.observable(framework);
    }
}

ko.applyBindings(new HelloViewModel("TypeScript", "Knockout"));

and here is my sample.js file:

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var ko = require("knockout");
ko;
var HelloViewModel = /** @class */ (function () {
    function HelloViewModel(language, framework) {
        this.language = ko.observable(language);
        this.framework = ko.observable(framework);
    }
    return HelloViewModel;
}());
ko.applyBindings(new HelloViewModel("TypeScript", "Knockout"));

However, when running it on the browser, an error message pops up saying: Uncaught ReferenceError: exports is not defined at sample.js:2

I have been trying to find a solution for this issue but haven't had any luck so far. If you have any tips or solutions, please share them.

You can also check out my project here: https://github.com/hoangdangduy/StreamingVideoWeb

Answer №1

Your JavaScript file is missing the necessary 'define' statement. Here is the corrected code snippet:

define(["require", "exports", "knockout"], function (require, exports, ko) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    ko;
     var HelloViewModel =  (function () {
        function HelloViewModel(language, framework) {
            this.language = ko.observable(language);
            this.framework = ko.observable(framework); 
}         
return HelloViewModel;  
}());  

ko.applyBindings(new HelloViewModel("TypeScript", "Knockout"));   
});

I noticed this issue when pasting your code into the TypeScript REPL tool.

In addition, consider changing

import * as ko from "knockout"; ko;

to

import ko from "knockout";

Answer №2

import/export are not supported in browser environments.

To resolve this issue, consider utilizing a bundler like webpack alongside TypeScript.

Or, you can experiment with specifying "module": "umd" within your tsconfig.json.

Answer №3

Appreciate the help everyone, I managed to resolve the issue by incorporating requirejs to load the module following the compilation of my ts file and knockout ts.

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