🔎 Search Terms

esm module import export

🕗 Version & Regression Information

This reproduces with version 5.6

⏯ Playground Link

https://www.typescriptlang.org/play/?module=7#code/JYWwDg9gTgLgBDAnmApnAVHAhgZzgIyyjgDMoIQ4ByEiCKgbgCgmBjAG1zwDE64BvFnGFwwUYADcsMNDJwwAFAEoBTEevYp4WAFxwAdgFcQ+FFGbqRWOAF4EAC2A4AdKwphDM5RZEBfNu6eKMp6RiZmqjD25ADuBihxAKJQ5FAKAEQAslr2EAAmBhDwoGCaICj6MnnO6UrM-qxQWDHsypHREHH6CXDJqRnZUfmFxeBlFVU1dUz+vkA

💻 Code

import type * from 'foo';

class Foo {

    private test() {
       let a: number;
       a = this.compute();
    }
compute(): number {
throw new Error("Method not implemented.");
}
crawl() {
throw new Error("Method not implemented.");
}
}

🙁 Actual behavior

There is a export {}; at the end of the JS file.

🙂 Expected behavior

import type should have no side-effects on the generated JS.

Additional information about the issue

The issue here is that this forces the JS file to be ESM when it maybe is not. This makes it hard to convert from JS to TS where in JS I have more control over this.