One Declaration per File

Only a single declaration is allowed in a file

• Identifier: one_declaration_per_file
• Enabled by default: No
• Supports autocorrection: No
• Kind: idiomatic
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning

Non Triggering Examples

class Foo {}

class Foo {}
extension Foo {}

struct S {
    struct N {}
}

Triggering Examples

class Foo {}
↓class Bar {}

protocol Foo {}
↓enum Bar {}

struct Foo {}
↓struct Bar {}