How to use the graphql-dynamodb-transformer.default function in graphql-dynamodb-transformer

execute(schemaFile, output) {
        const transformer = new graphql_transform_1.default({
            transformers: [
                new graphql_appsync_transformer_1.default(),
                new graphql_dynamodb_transformer_1.default(),
                new graphql_auth_transformer_1.default()
            ]
        });
        const cfdoc = transformer.transform(schemaFile.readSync());
        output.writeSync(JSON.stringify(cfdoc, null, 4));
    }
};