Switch linting to ESLint and Prettier (#191)

* Switch linting to ESLint and Prettier
* Clean up config
* Prettier fixes

lib/send-request.js

@@ -1,78 +1,86 @@
 var updateQueryString = require("./util/update-query-string");
 
 module.exports = function(location, options, callback) {
-  options = options || {}
-  var queryString
-  var requestOptions = options.requestOptions || {}
-  var requestMethod = (requestOptions.requestMethod || "GET").toUpperCase()
-  var requestParams = requestOptions.requestParams || null
+  options = options || {};
+  var queryString;
+  var requestOptions = options.requestOptions || {};
+  var requestMethod = (requestOptions.requestMethod || "GET").toUpperCase();
+  var requestParams = requestOptions.requestParams || null;
   var formData = requestOptions.formData || null;
-  var requestPayload = null
-  var request = new XMLHttpRequest()
-  var timeout = options.timeout || 0
+  var requestPayload = null;
+  var request = new XMLHttpRequest();
+  var timeout = options.timeout || 0;
 
   request.onreadystatechange = function() {
     if (request.readyState === 4) {
       if (request.status === 200) {
-        callback(request.responseText, request, location, options)
-      }
-      else if (request.status !== 0) {
-        callback(null, request, location, options)
+        callback(request.responseText, request, location, options);
+      } else if (request.status !== 0) {
+        callback(null, request, location, options);
       }
     }
-  }
+  };
 
   request.onerror = function(e) {
-    console.log(e)
-    callback(null, request, location, options)
-  }
+    console.log(e);
+    callback(null, request, location, options);
+  };
 
   request.ontimeout = function() {
-    callback(null, request, location, options)
-  }
+    callback(null, request, location, options);
+  };
 
   // Prepare the request payload for forms, if available
   if (requestParams && requestParams.length) {
     // Build query string
-    queryString = (requestParams.map(function(param) {return param.name + "=" + param.value})).join("&")
+    queryString = requestParams
+      .map(function(param) {
+        return param.name + "=" + param.value;
+      })
+      .join("&");
 
     switch (requestMethod) {
       case "GET":
         // Reset query string to avoid an issue with repeat submissions where checkboxes that were
         // previously checked are incorrectly preserved
-        location = location.split("?")[0]
+        location = location.split("?")[0];
 
         // Append new query string
-        location += "?" + queryString
-        break
+        location += "?" + queryString;
+        break;
 
       case "POST":
         // Send query string as request payload
-        requestPayload = queryString
-        break
+        requestPayload = queryString;
+        break;
     }
-  }
-  else if (formData) {
-    requestPayload = formData
+  } else if (formData) {
+    requestPayload = formData;
   }
 
   // Add a timestamp as part of the query string if cache busting is enabled
   if (options.cacheBust) {
-    location = updateQueryString(location, "t", Date.now())
+    location = updateQueryString(location, "t", Date.now());
   }
 
-  request.open(requestMethod, location, true)
-  request.timeout = timeout
-  request.setRequestHeader("X-Requested-With", "XMLHttpRequest")
-  request.setRequestHeader("X-PJAX", "true")
-  request.setRequestHeader("X-PJAX-Selectors", JSON.stringify(options.selectors))
+  request.open(requestMethod, location, true);
+  request.timeout = timeout;
+  request.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+  request.setRequestHeader("X-PJAX", "true");
+  request.setRequestHeader(
+    "X-PJAX-Selectors",
+    JSON.stringify(options.selectors)
+  );
 
   // Send the proper header information for POST forms
   if (requestPayload && requestMethod === "POST" && !formData) {
-    request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
+    request.setRequestHeader(
+      "Content-Type",
+      "application/x-www-form-urlencoded"
+    );
   }
 
-  request.send(requestPayload)
+  request.send(requestPayload);
 
-  return request
-}
+  return request;
+};