How to use the @aws-cdk/cfnspec.schema.isScalarPropery function in @aws-cdk/cfnspec

const union = this.renderTypeUnion(resourceContext, itemTypes);

      if (schema.isMapProperty(propSpec)) {
        alternatives.push(`{ [key: string]: (${union}) }`);
      } else {
        // To make TSLint happy, we have to either emit: SingleType[] or Array
        if (union.indexOf('|') !== -1) {
          alternatives.push(`Array<${union}>`);
        } else {
          alternatives.push(`${union}[]`);
        }
      }
    }

    // Yes, some types can be both collection and scalar. Looking at you, SAM.
    if (schema.isScalarPropery(propSpec)) {
      // Scalar type
      const typeNames = scalarTypeNames(propSpec);
      const types = genspec.specTypesToCodeTypes(resourceContext, typeNames);
      alternatives.push(this.renderTypeUnion(resourceContext, types));
    }

    // Only if this property is not of a "tokenizable type" (string, string[],
    // number in the future) we add a type union for `cdk.Token`. We rather
    // everything to be tokenizable because there are languages that do not
    // support union types (i.e. Java, .NET), so we lose type safety if we have
    // a union.
    if (!tokenizableType(alternatives) && propName !== 'Tags') {
      alternatives.push(genspec.TOKEN_NAME.fqn);
    }
    return alternatives.join(' | ');
  }