auto-sendable

A refactoring tool that ensures protocols, structs, enums, and classes conform to the Sendable protocol.

Summary

This tool modifies Swift code to conform to the Sendable protocol under the following conditions:

• All protocol types.
• struct and enum types marked with the public modifier.
• class types that do not contain any var variables (the final modifier is also applied).

Additionally, the tool conforms types to @unchecked Sendable under the following condition:

• class types that contain var variables.

Usage

Swift Command

Prepare

Clone this repository.

git clone https://github.com/nhiroyasu/auto-sendable.git
cd auto-sendable

Execute

swift run auto-sendable <dir_path_or_file_path_1> <dir_path_or_file_path_2>  ...

Example

auto-sendable

Before

public struct Struct {}
public enum Enum {}
public protocol Protocol {}
public class Class {}
public class VariablesClass {
    var variable: Int
}

After

public struct Struct: Sendable {}
public enum Enum: Sendable {}
public protocol Protocol: Sendable {}
public final class Class: Sendable {}
public class VariablesClass: @unchecked Sendable {
    var variable: Int
}

Warning

The auto-sendable command enforces conformance to the Sendable protocol for protocol, structs, enums, and classes, even when they might not naturally conform to Sendable (for example, if they contain stored properties that are not Sendable themselves).
As a result, it is not possible to completely eliminate compiler warnings.

public struct Obj: Sendable {  // warning: Obj struct isn't able to conform to the Sendable protocol.
    var variable: Class
}

public class Class {
    var count: Int
}