microsoft / microsoft/TypeScript

Cannot 'export default' abstract, ambient class or interface

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Description

export default abstract class B {

}

By the way, the same with

export default declare class B {

}

Seems to be a parser bug

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the abstract and ambient class examples in the issue and inspect the parser behavior for those declarations. The work is done when export default abstract class B and export default declare class B are accepted, along with the reported interface case.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
compilers
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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