How can I create a variant value using the generated TypeScript code?

Questions
1

This is the Daml declaration of a variant type:

data BookAttribute = Pages Int
                   | Authors [Text]
                   | Title Text
                   | Published with year: Int; publisher: Text
  deriving(Eq, Show)

This is the generated code for BookAttibute:

exports.BookAttribute = {
  decoder: damlTypes.lazyMemo(function () { return jtv.oneOf(jtv.object({tag: jtv.constant('Pages'), value: damlTypes.Int.decoder, }), jtv.object({tag: jtv.constant('Authors'), value: damlTypes.List(damlTypes.Text).decoder, }), jtv.object({tag: jtv.constant('Title'), value: damlTypes.Text.decoder, }), jtv.object({tag: jtv.constant('Published'), value: exports.BookAttribute.Published.decoder, })); }),
  encode: function (__typed__) {
  switch(__typed__.tag) {
    case 'Pages': return {tag: __typed__.tag, value: damlTypes.Int.encode(__typed__.value)};
    case 'Authors': return {tag: __typed__.tag, value: damlTypes.List(damlTypes.Text).encode(__typed__.value)};
    case 'Title': return {tag: __typed__.tag, value: damlTypes.Text.encode(__typed__.value)};
    case 'Published': return {tag: __typed__.tag, value: exports.BookAttribute.Published.encode(__typed__.value)};
    default: throw 'unrecognized type tag: ' + __typed__.tag + ' while serializing a value of type BookAttribute';
  }
}
,
  Published:({
    decoder: damlTypes.lazyMemo(function () { return jtv.object({year: damlTypes.Int.decoder, publisher: damlTypes.Text.decoder, }); }),
    encode: function (__typed__) {
  return {
    year: damlTypes.Int.encode(__typed__.year),
    publisher: damlTypes.Text.encode(__typed__.publisher),
  };
}
,
  }),
};

How can I express in the TypeScript code the equivalents of the following Daml values?

pages: BookAttribute = Pages 100
authors: BookAttribute = Authors ["Leo Tolstoy", "George Orwell"]
title: BookAttribute = Title "Alice's Adventures is Wonderland"
published: BookAttribute = Published 1865 "Macmillan"
2

Answering my own question:

TypeScript doesn’t have constructors, it just offers type annotations for objects, so this is how we can express one of the values above:

let published : BookAttribute = {"tag": "Published","value":{"year":"1865", "publisher":"Macmillan"}};