export docs from apigateway

apigateway export

//https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/APIGateway.html#getExport-property
const fs = require("fs");
const AWS = require("aws-sdk");
const path = require("path");
const apigateway = new AWS.APIGateway({
  apiVersion: "2015-07-09",
  region: "us-east-1"
});

const getExport = params => {
  return new Promise((resolve, reject) => {
    apigateway.getExport(params, (err, data) => {
      if (err) {
        reject(err, err.stack);
      } else {
        resolve(data);
      }
    });
  });
};

(async function() {
  try {
    const params = {
      exportType: "swagger",
      restApiId: "123",
      stageName: "prod",
      parameters: {
        extensions: "postman"
      }
    };
    const res = await getExport(params);
    const file = JSON.parse(res.body);
    fs.writeFileSync(
      path.join(process.cwd(), `${file.info.title}.json`),
      res.body
    );
  } catch (error) {
    console.log(error.message);
  }
})();