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But still I am having:
```
main.bundle.js:1 Uncaught (in promise) ReferenceError: JSONFormatter is not defined
    at P (main.bundle.js:1)
    at b (main.bundle.js:1) ```

Hi there, could you please provide a bit more information. At the first glance looks like it might anything :slightly_smiling_face: 
Probably that might be problem with modules. Which one are you using?

I am using commonjs but I tried also UMD, and it gives same error message

<@U9PHVDXDZ> here is the binding file which I generated: <https://github.com/CryptoVerseCC/http-claim-verifier-front/blob/js-formatter/src/main/kotlin/io/ghostbuster91/http/claim/verifier/front/json-formatter-js.kt>

Actually the ts2kt was only generating me the binding for JSFormatterConfiguration interface, so I changed the declaration of JSFormatter  in `.d.ts` file from class to interfase, and regenerated the biding

<@U0F95Q6CF> It seems you are using an NPM library, but the `external` declarations are marked with `@JsNonModule` annotations. That makes the compiler think that those classes could be referenced as is. What you probably want instead is `@JsModule`: <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.js/-js-module/index.html> . This annotation lets you tell the compiler, which NPM package contains the declaration. As a result the compiler generates appropriate `require` calls and imports those classes.