noExportedImports

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Diagnostic Category: lint/nursery/noExportedImports

JavaScript (and super languages)

Since: v1.9.0

Description

Disallow exporting an imported variable.

In JavaScript, you can re-export a variable either by using export from or by first importing the variable and then exporting it with a regular export.

You may prefer to use the first approach, as it clearly communicates the intention to re-export an import, and can make static analysis easier.

Examples

Invalid

import { A } from "mod";
export { A };

code-block.js:1:10 lint/nursery/noExportedImports ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ An import should not be exported. Use export from instead.
  
  > 1 │ import { A } from “mod”;
      │          ^
    2 │ export { A };
    3 │ 
  
  ℹ export from makes it clearer that the intention is to re-export a variable.

import * as ns from "mod";
export { ns };

code-block.js:1:8 lint/nursery/noExportedImports ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ An import should not be exported. Use export from instead.
  
  > 1 │ import * as ns from “mod”;
      │        ^^^^^^^
    2 │ export { ns };
    3 │ 
  
  ℹ export from makes it clearer that the intention is to re-export a variable.

import D from "mod";
export { D };

code-block.js:1:8 lint/nursery/noExportedImports ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ An import should not be exported. Use export from instead.
  
  > 1 │ import D from “mod”;
      │        ^
    2 │ export { D };
    3 │ 
  
  ℹ export from makes it clearer that the intention is to re-export a variable.

Valid

export { A } from "mod";
export * as ns from "mod";
export { default as D } from "mod";

How to configure

{
  "linter": {
    "rules": {
      "nursery": {
        "noExportedImports": "error"
      }
    }
  }
}