Create objects without prototypes when used as map with arbitrary keys

4 files changed, 15 insertions, 15 deletions

diff --git a/lib/docx/content-types-reader.js b/lib/docx/content-types-reader.js
index 8233119..adb45a6 100644
--- a/lib/docx/content-types-reader.js
+++ b/lib/docx/content-types-reader.js
@@ -14,9 +14,9 @@ exports.defaultContentTypes = contentTypes({}, {});
 
 
 function readContentTypesFromXml(element) {
-    var extensionDefaults = {};
-    var overrides = {};
-    
+    var extensionDefaults = Object.create(null);
+    var overrides = Object.create(null);
+
     element.children.forEach(function(child) {
         if (child.name === "content-types:Default") {
             extensionDefaults[child.attributes.Extension] = child.attributes.ContentType;
@@ -41,7 +41,7 @@ function contentTypes(overrides, extensionDefaults) {
             } else {
                 var pathParts = path.split(".");
                 var extension = pathParts[pathParts.length - 1];
-                if (extensionDefaults.hasOwnProperty(extension)) {
+                if (Object.prototype.hasOwnProperty.call(extensionDefaults, extension)) {
                     return extensionDefaults[extension];
                 } else {
                     var fallback = fallbackContentTypes[extension.toLowerCase()];
@@ -54,5 +54,5 @@ function contentTypes(overrides, extensionDefaults) {
             }
         }
     };
-    
+
 }
diff --git a/lib/docx/numbering-xml.js b/lib/docx/numbering-xml.js
index 9c86536..c747609 100644
--- a/lib/docx/numbering-xml.js
+++ b/lib/docx/numbering-xml.js
@@ -17,7 +17,7 @@ function Numbering(nums, abstractNums, styles) {
     );
 
     function findLevel(numId, level) {
-        return findLevelWithSeenNumIds(numId, level, {});
+        return findLevelWithSeenNumIds(numId, level, Object.create(null));
     }
 
     function findLevelWithSeenNumIds(numId, level, seenNumIds) {
@@ -63,7 +63,7 @@ function readNumberingXml(root, options) {
 }
 
 function readAbstractNums(root) {
-    var abstractNums = {};
+    var abstractNums = Object.create(null);
     root.getElementsByTagName("w:abstractNum").forEach(function(element) {
         var id = element.attributes["w:abstractNumId"];
         abstractNums[id] = readAbstractNum(element);
@@ -72,7 +72,7 @@ function readAbstractNums(root) {
 }
 
 function readAbstractNum(element) {
-    var levels = {};
+    var levels = Object.create(null);
 
     // Some malformed documents define numbering levels without an index, and
     // reference the numbering using a w:numPr element without a w:ilvl child.
@@ -110,7 +110,7 @@ function readAbstractNum(element) {
 }
 
 function readNums(root) {
-    var nums = {};
+    var nums = Object.create(null);
     root.getElementsByTagName("w:num").forEach(function(element) {
         var numId = element.attributes["w:numId"];
         var abstractNumId = element.first("w:abstractNumId").attributes["w:val"];
diff --git a/lib/docx/relationships-reader.js b/lib/docx/relationships-reader.js
index 5f54f42..a3df9a9 100644
--- a/lib/docx/relationships-reader.js
+++ b/lib/docx/relationships-reader.js
@@ -19,12 +19,12 @@ function readRelationships(element) {
 }
 
 function Relationships(relationships) {
-    var targetsByRelationshipId = {};
+    var targetsByRelationshipId = Object.create(null);
     relationships.forEach(function(relationship) {
         targetsByRelationshipId[relationship.relationshipId] = relationship.target;
     });
 
-    var targetsByType = {};
+    var targetsByType = Object.create(null);
     relationships.forEach(function(relationship) {
         if (!targetsByType[relationship.type]) {
             targetsByType[relationship.type] = [];
diff --git a/lib/docx/styles-reader.js b/lib/docx/styles-reader.js
index 276a668..1daa5e9 100644
--- a/lib/docx/styles-reader.js
+++ b/lib/docx/styles-reader.js
@@ -22,10 +22,10 @@ function Styles(paragraphStyles, characterStyles, tableStyles, numberingStyles)
 Styles.EMPTY = new Styles({}, {}, {}, {});
 
 function readStylesXml(root) {
-    var paragraphStyles = {};
-    var characterStyles = {};
-    var tableStyles = {};
-    var numberingStyles = {};
+    var paragraphStyles = Object.create(null);
+    var characterStyles = Object.create(null);
+    var tableStyles = Object.create(null);
+    var numberingStyles = Object.create(null);
 
     root.getElementsByTagName("w:style").forEach(function(styleElement) {
         var style = readStyleElement(styleElement);