Avoid duplicate enum member values

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Metadata

ID: typescript-best-practices/no-duplicate-enum-values

Language: TypeScript

Severity: Warning

Category: Error Prone

Description

An enum should not have duplicate values, which are usually not expected to be present.

Non-Compliant Code Examples

enum A {
    A = 1,
    B = 1,
}
enum B {
    A = 'A',
    B = 'A',
}
enum C {
  A = 'A',
  B = 'A',
  C = 1,
  D = 1,
}
enum E {
    A = 'A',
    B = 'A',
    C = 1,
    D = 1,
}

Compliant Code Examples

enum A {
  A,
  B,
}

enum B {
  A = 1,
  B,
}

enum C {
  A = 1,
  B = 2,
}

enum D {
  A = 'A',
  B = 'B',
}

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

enum F {
  A = 'A',
  B = 'B',
  C = 2,
  D = 1 + 1,
}

enum G {
  A = 3,
  B = 2,
  C,
}

enum H {
  A = 'A',
  B = 'B',
  C = 2,
  D = foo(),
}

enum I {
  A = '',
  B = 0,
}

enum J {
  A = 0,
  B = -0,
  C = NaN,
}