noDuplicateEnumValues

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JavaScript (and super languages)

Summary

Diagnostic Category: lint/nursery/noDuplicateEnumValues
This rule doesn’t have a fix.
The default severity of this rule is information.
Sources:
- Same as @typescript-eslint/no-duplicate-enum-values

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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        "noDuplicateEnumValues": "error"
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      }
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    }
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  }
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}

Description

Disallow duplicate enum member values.

Although TypeScript supports duplicate enum member values, people usually expect members to have unique values within the same enum. Duplicate values can lead to bugs that are hard to track down.

Examples

Invalid

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enum E {
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  A = 0,
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  B = 0,
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}

code-block.ts:3:3 lint/nursery/noDuplicateEnumValues ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Duplicate enum member value.
  
    1 │ enum E {
    2 │   A = 0,
  > 3 │   B = 0,
      │   ^^^^^
    4 │ }
    5 │ 
  
  ℹ Expected members to have unique values. Duplicate values can lead to bugs that are hard to track down.
  
  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.

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enum E {
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  A = "A",
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  B = 'A',
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  C = `A`,
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}

code-block.ts:3:3 lint/nursery/noDuplicateEnumValues ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Duplicate enum member value.
  
    1 │ enum E {
    2 │   A = “A”,
  > 3 │   B = ‘A’,
      │   ^^^^^^^
    4 │   C = `A`,
    5 │ }
  
  ℹ Another duplicate enum member value.
  
    2 │   A = “A”,
    3 │   B = ‘A’,
  > 4 │   C = `A`,
      │   ^^^^^^^
    5 │ }
    6 │ 
  
  ℹ Expected members to have unique values. Duplicate values can lead to bugs that are hard to track down.
  
  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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enum E {
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  A = 0,
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  B = 1,
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}

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enum E {
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  A = "A",
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  B = 'B',
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  C = `C`,
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}