Create object with null prototype

extension/manage/js/calendar-heatmap.js

@@ -9,7 +9,7 @@ function calendarHeatmap() {
     const MONTH_LABEL_PADDING = 6;
     let now = moment().endOf('day').toDate();
     let yearAgo = moment().startOf('day').subtract(1, 'year').toDate();
-    let counterMap = {};
+    let counterMap = Object.create(null)
     let colorRange = [];
     let tooltipEnabled = true;
     let tooltipUnit = 'contribution';

extension/manage/js/export.js

@@ -1,7 +1,7 @@
 (async function() {
     document.querySelector(".btn-export").onclick = async (event) => {
         let target = event.target.parentElement;
-        let data = {};
+        let data = Object.create(null)
         if (target.querySelector(".settings").checked) {
             data["settings"] = {
                 "auto-update": await settings.autoUpdate,
@@ -18,7 +18,7 @@
         }
         if (target.querySelector(".crates").checked) {
             let catalog = await CrateDocManager.getCrates();
-            let list = {};
+            let list = Object.create(null)
             for (const name of Object.keys(catalog)) {
                 list[`@${name}`] = await CrateDocManager.getCrateSearchIndex(name);
             }

extension/manage/js/index.js

@@ -128,7 +128,7 @@ const STATS_MAP = {
     let ol = searchStatsText.querySelector("ol");
 
     // Generate default type data.
-    let defaultTypeData = {};
+    let defaultTypeData = Object.create(null)
     Object.keys(STATS_MAP).forEach(name => {
         defaultTypeData[name] = 0;
     });

extension/script/add-search-index.js

@@ -32,7 +32,7 @@
             const STD_CRATES = ['std', 'test', 'proc_macro'];
 
             // Remove unnecessary std crate's search index, such as core, alloc, etc
-            let searchIndex = {};
+            let searchIndex = Object.create(null)
             STD_CRATES.forEach(crate => {
                 searchIndex[crate] = window.searchIndex[crate];
             });

extension/search/crate.js

@@ -16,7 +16,7 @@ class CrateSearch {
         this.crateIndexVersion = crateIndexVersion;
         this.deminifier = new Deminifier(mapping);
 
-        this.crateIndex = {};
+        this.crateIndex = Object.create(null)
         for (let [key, value] of Object.entries(crateIndex)) {
             this.crateIndex[this.deminifier.deminify(key)] = value;
         }

extension/search/docs/base.js

@@ -297,7 +297,7 @@ class DocSearch {
 
         let val = this.valLower;
         const typeFilter = itemTypeFromName(query.type),
-            results = {};
+            results = Object.create(null)
 
         for (let z = 0; z < this.split.length; ++z) {
             if (this.split[z] === "") {

extension/search/docs/crate-doc.js

@@ -16,7 +16,7 @@ class CrateDocSearch {
     }
 
     async initAllCrateSearcher() {
-        let searchIndex = {};
+        let searchIndex = Object.create(null)
         for (const crateName of Object.keys(await CrateDocManager.getCrates())) {
             searchIndex = Object.assign(searchIndex, await CrateDocManager.getCrateSearchIndex(crateName));
         }

extension/statistics.js

@@ -43,9 +43,9 @@ function makeNumericKeyObject(start, end, initial = 0) {
 
 class Statistics {
     constructor() {
-        this.calendarData = {};
-        this.cratesData = {};
-        this.typeData = {};
+        this.calendarData = Object.create(null)
+        this.cratesData = Object.create(null)
+        this.typeData = Object.create(null)
         this.weeksData = WEEKS.reduce((obj, week) => {
             obj[week] = 0;
             return obj;