`prefer-export-from` breaks TypeScript support for `import *`

[KurtPreston]

I have the following TypeScript code:

import * as $MyJsonFile from './myJsonFile.json';
export const MyJsonFile = $MyJsonFile;

The prefer-export-from rule wants me to change the line to

export * as MyJsonFile from './myJsonFile.json';

Unfortunately, this results in the TypeScript compilation error:

Module '"myJsonFile"' uses 'export =' and cannot be used with 'export *'.ts(2498)

Ideally, prefer-export-from would be able to ignore export = modules which are incompatible with the syntax. If that is not possible to infer, then it would be nice to be able to specify certain patterns to exclude from the rule, like:

"prefer-export-from": ["error", {
  "ignorePatterns": ["*.json"]
}]

[fisker]

Does export {default as MyJsonFile} from './myJsonFile.json'; work?

[KurtPreston]

@fisker Unfortunately not. It results in this error:

Module '"./myJsonFile.json"' has no exported member 'default'.ts(2305)

[fisker]

Is this a typescript issue?

[fregante]

I can confirm that this is a TypeScript issue.

A few notes:

• the "correct" syntax is now import x from './file.json' with {type: 'json'} (works in TS)
• unicorn correctly autofixes export {x} to export {default as x} from from './file.json' with {type: 'json'} (works in TS)
• after adding with {type: 'json'}, your code works in Node 22 (but still doesn't in TS 5.5)

Given that unicorn produces valid code, this isn't a bug here. I'm reclassifying it as a feature request to improve support with TS until TS fixes their own bug.

If you file a report with TS or find an open bug, please link it here.