code: private String getSoyElementClassName() {
      Preconditions.checkState(
          alias.startsWith("$"),
          "Alias should start with '$', or template class name may be malformed.");
      return "$"
          // `alias` has '$' as the 0th char, so capitalize the 1st char.
          + Ascii.toUpperCase(alias.charAt(1))
          /// ...and concat the rest of the alias.
          + alias.substring(2)
          + "Element";
    }
docs: Constructs template class name, e.g. converts template `ns.foo` => `$FooElement`.