noRedundantDefaultExport

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JavaScript (and super languages)

Summary

Rule available since: v2.3.14
Diagnostic Category: lint/nursery/noRedundantDefaultExport
This rule doesn’t have a fix.
The default severity of this rule is warning.

How to configure

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

Description

Checks if a default export exports the same symbol as a named export.

This rule warns when a default export references the same identifier as a named export. Re-exports are out of scope.

Examples

Invalid

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export const foo = 42;
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export default foo;

code-block.js:2:16 lint/nursery/noRedundantDefaultExport ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Default export exports the same symbol as a named export.
  
    1 │ export const foo = 42;
  > 2 │ export default foo;
      │                ^^^
    3 │ 
  
  ℹ Exporting the same identifier as both a named export and a default export is redundant.
  
  ℹ Remove either the default export or the named export to avoid redundancy.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.

Valid

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export const foo = 42;
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export default 42;