AdsApp.​DraftBuilder

// Create a draft builder.
var draftBuilder = AdsApp.campaigns().get().next().newDraftBuilder();

// Create a draft operation.
var draftOperation = draftBuilder
  .withName("Sample Draft")                // required
  .build();

// Optional: examine the outcome. The call to isSuccessful()
// will block until the operation completes.
if (draftOperation.isSuccessful()) {
  // Get the result.
  var draft = draftOperation.getResult();
} else {
  // Handle the errors.
  var errors = draftOperation.getErrors();
}