Nodes

[mattesmohr]

The current idea is to have this three node declarations. Similar to your codebase.

public protocol ContentNode: HTMLNode {
    
    associatedtype Content
    
    var content: Content { get }
}

extension ContentNode {

    public func render() { // <tag>...</tag> }
}

In this case The ContentNode is generic. The reason here for is, that the content of Textarea, Title, Option and Script should only be String.

So now we can give a element the return type String

public struct TextArea: ContentNode {
    
    public typealias Content = String
    
    public var content: Content
    
    public init(, content: () -> Content) {
        self.content = content()
    }
}

With this we prevent, that the user tries to implement another element into Textarea, but String.

public protocol EmptyNode: HTMLNode {
}

extension EmptyNode {

    public func render() { // <tag /> }
}

public protocol CommentNode: HTMLNode {
    
    var content: String { get }
}

extension CommentNode {

    public func render() { // <!--...--> }
}

What do you think? Do you see some complications?