Error code 0x800a1391 - JavaScript runtime error: 'module' has not been defined

Question

Error code 0x800a1391 - JavaScript runtime error: 'module' has not been defined

My background is in C++ and I am just beginning to explore TypeScript. I'm facing a runtime error while trying to implement a design (interface/class) that spans multiple files. The error message reads:

0x800a1391 - JavaScript runtime error: 'module' is not defined

Here is the code snippet from Info.ts:

export = Test; <-----------   0x800a1391 - JavaScript runtime error: 'module' is not defined
namespace Test {
    export class Info {
    }
}

And here is the code snippet from TestWrapper.ts:

import { Info } from "./Info";    
namespace Test {
    class TestWrapper {
        public GetInfo(): Info {
            return this.m_info;
        }
    }
}

I'm wondering if I'm using something incorrectly in my code. Any insight would be greatly appreciated!

javascript typescript

Answer 1

Answer №1

Here's a thought:

export = Something

When compiled, it transforms into something like

module.exports = Something

The use of module.exports is part of the "commonjs module system", which is not supported in browsers but in node.js. If you try to run this code directly in a browser using a <script> tag, it will result in an error. TypeScript transpiles imports and exports to module systems specified in tsconfig.json, without actually implementing the module system itself.

What can be done?

If the intention is for this code to work in a browser, you can consider one of the following options:

Bundle the code using a module bundler like webpack, which will create a browser-compatible "bundle" by merging all files together. Webpack has plugins to incorporate TypeScript seamlessly, avoiding the need for a two-step build process; although module bundlers can be complex.
Remove modules from your files (meaning no top-level imports or exports) and import them via plain <script> tags.

Answer 2

Here's a thought:

export = Something

When compiled, it transforms into something like

module.exports = Something

The use of module.exports is part of the "commonjs module system", which is not supported in browsers but in node.js. If you try to run this code directly in a browser using a <script> tag, it will result in an error. TypeScript transpiles imports and exports to module systems specified in tsconfig.json, without actually implementing the module system itself.

What can be done?

If the intention is for this code to work in a browser, you can consider one of the following options:

Bundle the code using a module bundler like webpack, which will create a browser-compatible "bundle" by merging all files together. Webpack has plugins to incorporate TypeScript seamlessly, avoiding the need for a two-step build process; although module bundlers can be complex.
Remove modules from your files (meaning no top-level imports or exports) and import them via plain <script> tags.

Answer 3

Answer №2

Am I approaching this the wrong way?

Although namespaces are commonly utilized in other programming languages, they do not have native support in JavaScript. The TypeScript version offers a somewhat unconventional method to incorporate proper typing for certain elements (which I have yet to use). In your situation, you may not actually require a namespace. Simply:

 export default class Info { /*...*/ }

Following that, you can

import Info from "./Info";

export default class TestWrapper { /*...*/ }

Note: I am uncertain how to resolve the error using namespaces in this scenario.

Answer 4

Am I approaching this the wrong way?

Although namespaces are commonly utilized in other programming languages, they do not have native support in JavaScript. The TypeScript version offers a somewhat unconventional method to incorporate proper typing for certain elements (which I have yet to use). In your situation, you may not actually require a namespace. Simply:

 export default class Info { /*...*/ }

Following that, you can

import Info from "./Info";

export default class TestWrapper { /*...*/ }

Note: I am uncertain how to resolve the error using namespaces in this scenario.

Answer 5

Answer №3

It seems like you are experimenting with blending modules and namespaces. I recommend delving into the topic of Namespaces and Modules.

You should avoid using export at the top level with export = Test, as well as refrain from importing specific entities like Info when it's already contained within the Test namespace that includes TestWrapper.

If you opt for the namespace approach, here's a suggestion:

Info.ts

namespace Test {
    export class Info {}
}

TestWrapper.ts

namespace Test {
    export class TestWrapper {
        m_info: Info;
        public GetInfo(): Info {
            return this.m_info;
        }
    }
}

Consumer.ts

console.log(Test.TestWrapper);

To compile this, use:

tsc --outFile foo.js Info.ts TestWrapper.ts Consumer.ts

Then run the code with:

node foo.js

This will output:

[Function: TestWrapper]

Answer 6

It seems like you are experimenting with blending modules and namespaces. I recommend delving into the topic of Namespaces and Modules.

You should avoid using export at the top level with export = Test, as well as refrain from importing specific entities like Info when it's already contained within the Test namespace that includes TestWrapper.

If you opt for the namespace approach, here's a suggestion:

Info.ts

namespace Test {
    export class Info {}
}

TestWrapper.ts

namespace Test {
    export class TestWrapper {
        m_info: Info;
        public GetInfo(): Info {
            return this.m_info;
        }
    }
}

Consumer.ts

console.log(Test.TestWrapper);

To compile this, use:

tsc --outFile foo.js Info.ts TestWrapper.ts Consumer.ts

Then run the code with:

node foo.js

This will output:

[Function: TestWrapper]

Error code 0x800a1391 - JavaScript runtime error: 'module' has not been defined

Answer №1

Answer №2

Answer №3

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