Generic array builder using swift 5.4 result builder

ArrayBuilder.swift

@resultBuilder
enum ArrayBuilder<OutputModel> {
    static func buildEither(first component: [OutputModel]) -> [OutputModel] {
        return component
    }

    static func buildEither(second component: [OutputModel]) -> [OutputModel] {
        return component
    }

    static func buildOptional(_ component: [OutputModel]?) -> [OutputModel] {
        return component ?? []
    }

    static func buildExpression(_ expression: OutputModel) -> [OutputModel] {
        return [expression]
    }

    static func buildExpression(_ expression: ()) -> [OutputModel] {
        return []
    }

    static func buildBlock(_ components: [OutputModel]...) -> [OutputModel] {
        return components.flatMap { $0 }
    }
    
    static func buildArray(_ components: [[OutputModel]]) -> [OutputModel] {
            Array(components.joined())
        }
}

// Example usage

public struct OutputModel {
    
}

public struct ExampleTransform {

    public init() {
    }
    
    @ArrayBuilder<OutputModel>
    func transform() -> [OutputModel] {
        OutputModel()
        OutputModel()
        
        if true {
            OutputModel()
        }
        
        for _ in 0...3 {
            OutputModel()
        }
        
        OutputModel()
        
    }
}