ConditionalModifier.swift

extension View {
    /// Conditionally apply modifiers to a view.
    func `if`<Content: View>(_ condition: () -> Bool, content: (Self) -> Content) -> some View {
        condition() ?
            ViewBuilder.buildEither(first: content(self)) :
            ViewBuilder.buildEither(second: self)
    }

    func `if`<Content: View>(_ condition: @autoclosure () -> Bool, content: (Self) -> Content) -> some View {
        condition() ?
            ViewBuilder.buildEither(first: content(self)) :
            ViewBuilder.buildEither(second: self)
    }
}

Example:

Text("Hello world")
    .if(isHighlighted) { section in
         section.foregroundColor(.red)
    }