@types/ - TS1209: Ambient const enums are not allowed when the '--isolatedModules' flag is provided.

[wallzero]

If you know how to fix the issue, make a pull request instead.

• I tried using the @types/xxxx package and had problems.
• I tried using the latest stable version of tsc. https://www.npmjs.com/package/typescript
• I have a question that is inappropriate for StackOverflow. (Please ask any appropriate questions there).
• Mention the authors (see Definitions by: in index.d.ts) so they can respond.
  • Authors: @tlaziuk

I updated my builds to use Babel7 after following the official blog post.

However, @types/range-parser (which appears to a dependency of express) throws an error during compilation: TS1209: Ambient const enums are not allowed when the '--isolatedModules' flag is provided.

I can disable isolatedModules and my project builds but the guide says it is needed to disallow features that require cross-file information for emit.

[bopfer]

Any movement on this? I am running into the same issue. According to the comments here: microsoft/TypeScript#20703 (comment), it should be changed to a union type of literals instead.

Removing const from the enum also seems to work, but I am not sure if that is a proper fix.

[wyqydsyq]

This issue has been resolved in #29783 but a naughty bot closed the PR as a result of Travis CI failing, seemingly due to errors from completely unrelated packages. Looks like a maintainer/contributor with adequate permissions will need to manually re-open the PR to make travis test it again.

[orta]

Hi thread, we're moving DefinitelyTyped to use GitHub Discussions for conversations the @types modules in DefinitelyTyped.

To help with the transition, we're closing all issues which haven't had activity in the last 6 months, which includes this issue. If you think closing this issue is a mistake, please pop into the TypeScript Community Discord and mention the issue in the definitely-typed channel.