Reorganize the document childNodes checks

extension/src/json-viewer/check-if-json.js

@@ -1,14 +1,18 @@
 var extractJSON = require('./extract-json');
 
 function allTextNodes(nodes) {
-  return Object.keys(nodes).reduce(function(result, key) {
-    return result && nodes[key].nodeName === '#text'
-  }, true)
+  return !Object.keys(nodes).some(function(key) {
+    return nodes[key].nodeName !== '#text'
+  })
 }
 
 function getPreWithSource() {
   var childNodes = document.body.childNodes;
 
+  if (childNodes.length === 0) {
+    return null
+  }
+
   if (childNodes.length > 1 && allTextNodes(childNodes)) {
     if (process.env.NODE_ENV === 'development') {
       console.debug("[JSONViewer] Loaded from a multiple text nodes, normalizing");
@@ -17,26 +21,25 @@ function getPreWithSource() {
     document.body.normalize() // concatenates adjacent text nodes
   }
 
-  if (childNodes.length === 1) {
-    var childNode = childNodes[0];
-    var nodeName = childNode.nodeName
-    var textContent = childNode.textContent
-
-    if (nodeName === "PRE") {
-      return childNode;
-
-    // if Content-Type is text/html
-    } else if (nodeName === "#text" && textContent.trim().length > 0) {
-      if (process.env.NODE_ENV === 'development') {
-        console.debug("[JSONViewer] Loaded from a text node, this might have returned content-type: text/html");
-      }
-
-      var pre = document.createElement("pre");
-      pre.textContent = textContent;
-      document.body.removeChild(childNode);
-      document.body.appendChild(pre);
-      return pre;
+  var childNode = childNodes[0];
+  var nodeName = childNode.nodeName
+  var textContent = childNode.textContent
+
+  if (nodeName === "PRE") {
+    return childNode;
+  }
+
+  // if Content-Type is text/html
+  if (nodeName === "#text" && textContent.trim().length > 0) {
+    if (process.env.NODE_ENV === 'development') {
+      console.debug("[JSONViewer] Loaded from a text node, this might have returned content-type: text/html");
     }
+
+    var pre = document.createElement("pre");
+    pre.textContent = textContent;
+    document.body.removeChild(childNode);
+    document.body.appendChild(pre);
+    return pre;
   }
 
   return null