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+Setup for a new Repository with Nightcrawler
+=====================
+
+
+## Install this package using NPM or Yarn:
+```bash
+yarn add lastcall-nightcrawler
+```
+
+## Define your crawler by creating a `nightcrawler.js` file in the root directory, like this:
+```js
+const Crawler = require('lastcall-nightcrawler');
+const Number  = Crawler.metrics.Number;
+const Milliseconds = Crawler.metrics.Milliseconds;
+const Percent = Crawler.metrics.Percent;
+
+const myCrawler = new Crawler('My Crawler');
+
+// Use a base and urls from json file.
+// Location of the json file being used.
+const pages = require('./page');
+const environments = require('./environment');
+
+function parseOpt(optname, defaultValue = undefined) {
+  const matches = process.argv.filter(arg => arg.indexOf(`--${optname}=`) === 0);
+  return matches.length ? matches[0].replace(`--${optname}=`, '') : defaultValue
+}
+
+// Determine the proper environment to point at.
+const target = parseOpt('target', 'local');
+let environment;
+if(target in environments) {
+  environment = environments[target];
+}
+// Detect appserver URL from LANDO_INFO if possible.
+else if(target === 'local' && process.env.LANDO_INFO) {
+  const info = JSON.parse(process.env.LANDO_INFO);
+  if(info.appserver_nginx && info.appserver_nginx.urls.length > 0) {
+    const url = info.appserver_nginx.urls.pop();
+    environment = {name: "Local", url: url}
+  }
+  else if(info.appserver && info.appserver.urls.length > 0) {
+    const url = info.appserver.urls.pop();
+    environment = {name: "Local", url: url}
+  }
+}
+else if(target.match(/^http:/)) {
+  environment = {name: 'Local', url: target}
+}
+else {
+  throw new Error(`--target flag must be set to a known environment or a URL. ${target} is not known.`)
+}
+
+myCrawler.on('setup', function(crawler) {
+  // On setup, give the crawler a list of URLs to crawl by combining the
+  // page URLs with the base URL.
+  pages.forEach(page => crawler.enqueue(`${environment.url}${page.url}`))
+});
+
+// Collect additional data about each response.
+myCrawler.on('response.success', function (response, data) {
+  data.statusMessage = response.statusMessage;
+});
+
+/**
+ * Analyze the data once it's been collected.
+ */
+myCrawler.on('analyze', function (crawlReport, analysis) {
+  // On analysis, derive the metrics you need from the
+  // array of collected data.
+  var data = crawlReport.data;
+
+  // Calculate the number of requests that were made:
+  analysis.addMetric('count', new Number('Total Requests', 0, data.length));
+
+  // Calculate the average response time:
+  var avgTime = data.reduce(function (sum, dataPoint) {
+    return sum + dataPoint.backendTime
+  }, 0) / data.length;
+  analysis.addMetric('time', new Milliseconds('Avg Response Time', 0, avgTime));
+
+  // Calculate the percent of requests that were marked failed:
+  var failRatio = data.filter(function (dataPoint) {
+    return dataPoint.fail === true;
+  }).length / data.length;
+  var level = failRatio > 0 ? 2 : 0;
+  analysis.addMetric('fail', new Percent('% Failed', level, failRatio));
+
+  // Calculate the percent of requests that resulted in a 500 response.
+  var serverErrorRatio = data.filter(function (dataPoint) {
+    return dataPoint.statusCode >= 500;
+  }).length / data.length;
+  var level = serverErrorRatio > 0 ? 2 : 0;
+  analysis.addMetric('500', new Percent('% 500', level, serverErrorRatio));
+
+  data.forEach(function(request) {
+    var level = request.statusCode > 499 ? 2 : 0
+    analysis.addResult(request.url, level)
+  });
+});
+
+module.exports = myCrawler;
+```
+
+## Adding `environment.json` and `page.json` to the repository (if needed)
+Next step would be to create the following files: `environment.json` and `page.json` in the root directory.
+If you have already created those files for BackstopJS skip this step.
+
+
+### `environment.json`
+If you have not created a `environment.json` file yet add the following information to the `environment.json` file:
+
+```$xslt
+{
+  "local": {
+    "url": "http://drupal:80",
+    "name": "Local"
+  }
+  "prod": {
+    "url": "https://www.example.com",
+    "name": "Production"
+  }
+  "test": {
+    "url": "https://www.example.com",
+    "name": "Test"
+  }
+      
+}
+```   
+If you are using lando.yml remove the `local` from the `environment.json` file it's not needed.
+
+### `page.json`
+If you have not created a `page.json` file yet add the following information to the `page.json` file:
+
+```$xslt
+[
+  {"label": "Homepage", "url": "/"},
+  {"label":  "ExampleSelector", "url":  "/",
+    "backstopSelectors": [
+      ".nav-header",
+      "document"
+    ]
+  }
+]
+```
+You will notice a `backstopsSelectors` in the snippet. If this page.json is only being used for Nightcrawler you
+will on need the following: `{"label": "Homepage", "url": "/"},` for each page URL you want to test with Nightcrawler. 
+Those same page URLs can be used with BackstopJS.
+
+If it's a Drupal site you can use the following fetch URLs with Drush. Example would be [Openmass Nightcrawler](https://github.com/massgov/openmass/blob/develop/.circleci/nightcrawler/fetch_urls.js). 
+It would include adjusting some of the Nightcrawler.js script with samples and to run the query with Nightcrawler.