no-case-mismatch

Full name

@azure-tools/typespec-azure-core/no-case-mismatch

Validate that no two types have the same name with different casing. Having types that differ only by casing can cause issues in case-insensitive languages and is generally confusing. This applies to models, enums, and unions.

Note

Template instances are not checked by this rule since they are not distinct type declarations.

❌ Incorrect

Two models that differ only by casing:

model FailOverProperties {
  priority: int32;
}

model FailoverProperties {
  priority: int32;
}

Multiple types with case variations:

model FailOverProperties {}
model FailoverProperties {}
model Failoverproperties {}

✅ Correct

Types with meaningfully different names:

model FailedOver {
  status: string;
}

model FailOver {
  priority: int32;
}