Empty exports

[Vardner]

Bug Report

🔎 Search Terms

prevent empty exports {} Object.defineProperty(exports, "__esModule", { value: true });

🕗 Version & Regression Information

• This is a crash
• This changed between versions 3.9.6 and 4.2.4

⏯ Playground Link

Playground link with relevant code, change typescript version between 3.9.4 and 4+

💻 Code

import {ABC} from './abc';
const a = 12;

🙁 Actual behavior

🙂 Expected behavior

Hello, I have some problems when typescript generates empty exports in each file by itself. I use TS compiler to generate files that will be executed by eval. When eval happens I get an error because of exports.
In typescript config, we have the option "isolatedModules", which could do this part of the functionality.

Anyway, how can I get rid of any kind of exports in complied files? I hope you can help me because these exports force me to call string.replace() before executing the files!

[nmain]

When you type import {ABC} from './abc'; you're using es modules syntax and so Typescript is processing your code as an es module. It's producing output that's also es modules because of your compiler module setting. Depending on what your runtime environment looks like, you could either change the compiler's module setting, or use some sort of bundler, but what you're asking to do just doesn't work out of the box -- you can't eval an es module.

[MartinJohns]

See also #41567, #41562, #41513.

[Vardner]

When you type import {ABC} from './abc'; you're using es modules syntax and so Typescript is processing your code as an es module. It's producing output that's also es modules because of your compiler module setting. Depending on what your runtime environment looks like, you could either change the compiler's module setting, or use some sort of bundler, but what you're asking to do just doesn't work out of the box -- you can't eval an es module.

yea, of course, but I use imports only for types and interfaces, so none of my files intend to be modules

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.