How to use the apollo-codegen-core/lib/utilities/graphql.isTypeProperSuperTypeOf function in apollo-codegen-core

const fragmentSpreadSuperClasses = (fragmentSpreads || []).filter(spread => {
    const fragment = generator.context.fragments[spread];
    const alwaysDefined = isTypeProperSuperTypeOf(
      generator.context.schema,
      fragment.typeCondition,
      parentType
    );

    return alwaysDefined;
  });

fragmentSpreads.forEach(s => {
            const fragment = generator.context.fragments[s];
            const alwaysDefined = isTypeProperSuperTypeOf(
              generator.context.schema,
              fragment.typeCondition,
              parentType
            );
            if (!alwaysDefined) {
              generator.printOnNewline(`def as${s}`);
              generator.print(`: Option[${s}] =`);
              generator.withinBlock(() => {
                generator.printOnNewline(
                  `if (${s}.possibleTypes.contains(orig.asInstanceOf[scala.scalajs.js.Dynamic].__typename.asInstanceOf[String])) Some(orig.asInstanceOf[${s}]) else None`
                );
              });
            }
          });
        }