microsoft / microsoft/TypeScript
Declaration file emitted with esModuleInterop can't be consumed without it
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Domain: Declaration Emit
Experience Enhancement
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Description
TypeScript Version: 3.2.0-dev.20181019
Search Terms:
Code
import abs from "abs"; // using @types/abs which uses `export =`
export const x: typeof abs = <any>null;
Expected behavior:
Output .d.ts is:
import abs = require("abs");
export declare const x: typeof abs;
Actual behavior:
import abs from "abs";
export declare const x: typeof abs;
Discovered in quill on DefinitelyTyped, which imports from quill-delta, which is written in TypeScript with esModuleInterop.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue with the TypeScript code in the report and compare the emitted .d.ts under esModuleInterop with a consumer that does not enable it. Trace declaration emission for the default import from the @types/abs package; done when the generated declaration is consumable without esModuleInterop and preserves the expected require-style import.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100