Example of record construction syntax for multiple constructors

file.cs

[ProjectFileTypeDefinition(Name)]
public class HtmlProjectFileType : KnownProjectFileType
{
  public new const string Name = "HTML";
  public const string HTML_EXTENSION = ".html";
  public const string HTM_EXTENSION = ".htm";
  
  public new static readonly HtmlProjectFileType Instance;
 
  private HtmlProjectFileType() : base(Name, "Html", new[] {HTML_EXTENSION, HTM_EXTENSION})  {  }
  protected HtmlProjectFileType(string name) : base(name)  {  }
  protected HtmlProjectFileType(string name, string presentableName) : base(name, resentableName)  {  }
  protected HtmlProjectFileType(string name, string presentableName, IEnumerable<string> extensions) : base(name, presentableName, extensions)  {  }
}

file.fs

[<Literal>]let Name = "F#"
[<Literal>]let PresentableName = "FSHARP"
[<Literal>]let FS_EXTENSION = ".fs"

[<ProjectFileTypeDefinition(Name)>]
type FSharpProjectFileType =
    inherit KnownProjectFileType
    new() = {inherit KnownProjectFileType(Name, PresentableName, [|FS_EXTENSION|]) }
    new(name) = {inherit KnownProjectFileType(name) }
    new(name, presentableName) = { inherit KnownProjectFileType(name, presentableName) }
    new(name, presentableName, extensions) = { inherit KnownProjectFileType(name, presentableName, extensions) }

    [<DefaultValue>] static val mutable private instance: FSharpProjectFileType
    static member Instance with get() = FSharpProjectFileType()