diff --git a/src/cli/expand-patterns.js b/src/cli/expand-patterns.js
index 424f69aa7..d37ed34f5 100644
--- a/src/cli/expand-patterns.js
+++ b/src/cli/expand-patterns.js
@@ -55,9 +55,9 @@ function* expandPatternsInternal(context) {
 
   const globOptions = {
     dot: true,
-    ignore: Object.keys(silentlyIgnoredDirs)
-      .filter((dir) => silentlyIgnoredDirs[dir])
-      .map((dir) => "**/" + dir),
+    ignore: Object.entries(silentlyIgnoredDirs)
+      .filter(([, ignored]) => ignored)
+      .map(([dir]) => "**/" + dir),
   };
 
   let supportedFilesGlob;
diff --git a/src/cli/option.js b/src/cli/option.js
index b71726382..5533e9666 100644
--- a/src/cli/option.js
+++ b/src/cli/option.js
@@ -20,13 +20,14 @@ function getOptions(argv, detailedOptions) {
 }
 
 function cliifyOptions(object, apiDetailedOptionMap) {
-  return Object.keys(object || {}).reduce((output, key) => {
-    const apiOption = apiDetailedOptionMap[key];
-    const cliKey = apiOption ? apiOption.name : key;
+  return fromPairs(
+    Object.entries(object || {}).map(([key, value]) => {
+      const apiOption = apiDetailedOptionMap[key];
+      const cliKey = apiOption ? apiOption.name : key;
 
-    output[dashify(cliKey)] = object[key];
-    return output;
-  }, {});
+      return [dashify(cliKey), value];
+    })
+  );
 }
 
 function createApiDetailedOptionMap(detailedOptions) {
diff --git a/src/cli/usage.js b/src/cli/usage.js
index 151de5a6a..2685b3bc6 100644
--- a/src/cli/usage.js
+++ b/src/cli/usage.js
@@ -176,11 +176,8 @@ function createDetailedUsage(context, flag) {
 
   const pluginDefaults =
     option.pluginDefaults && Object.keys(option.pluginDefaults).length > 0
-      ? `\nPlugin defaults:${Object.keys(option.pluginDefaults).map(
-          (key) =>
-            `\n* ${key}: ${createDefaultValueDisplay(
-              option.pluginDefaults[key]
-            )}`
+      ? `\nPlugin defaults:${Object.entries(option.pluginDefaults).map(
+          ([key, value]) => `\n* ${key}: ${createDefaultValueDisplay(value)}`
         )}`
       : "";
   return `${header}${description}${choices}${defaults}${pluginDefaults}`;
diff --git a/src/language-html/ast.js b/src/language-html/ast.js
index f612f67be..52b709ac6 100644
--- a/src/language-html/ast.js
+++ b/src/language-html/ast.js
@@ -1,5 +1,6 @@
 "use strict";
 
+const fromPairs = require("lodash/fromPairs");
 const { isNonEmptyArray } = require("../common/util");
 const NODES_KEYS = {
   attrs: true,
@@ -8,8 +9,7 @@ const NODES_KEYS = {
 
 class Node {
   constructor(props = {}) {
-    for (const key of Object.keys(props)) {
-      const value = props[key];
+    for (const [key, value] of Object.entries(props)) {
       if (key in NODES_KEYS) {
         this._setNodes(key, value);
       } else {
@@ -123,10 +123,13 @@ function cloneAndUpdateNodes(nodes, parent) {
 }
 
 function setNonEnumerableProperties(obj, props) {
-  const descriptors = Object.keys(props).reduce((reduced, key) => {
-    reduced[key] = { value: props[key], enumerable: false };
-    return reduced;
-  }, {});
+  const descriptors = fromPairs(
+    Object.entries(props).map(([key, value]) => [
+      key,
+      { value, enumerable: false },
+    ])
+  );
+
   Object.defineProperties(obj, descriptors);
 }
 
diff --git a/src/language-html/utils.js b/src/language-html/utils.js
index e4ac2446f..06b85e362 100644
--- a/src/language-html/utils.js
+++ b/src/language-html/utils.js
@@ -46,8 +46,8 @@ function arrayToMap(array) {
 
 function mapObject(object, fn) {
   const newObject = Object.create(null);
-  for (const key of Object.keys(object)) {
-    newObject[key] = fn(object[key], key);
+  for (const [key, value] of Object.entries(object)) {
+    newObject[key] = fn(value, key);
   }
   return newObject;
 }
diff --git a/src/language-js/utils.js b/src/language-js/utils.js
index 56eceef21..744685678 100644
--- a/src/language-js/utils.js
+++ b/src/language-js/utils.js
@@ -87,7 +87,7 @@ function hasNode(node, fn) {
   const result = fn(node);
   return typeof result === "boolean"
     ? result
-    : Object.keys(node).some((key) => hasNode(node[key], fn));
+    : Object.values(node).some((value) => hasNode(value, fn));
 }
 
 /**
diff --git a/src/main/comments.js b/src/main/comments.js
index 0594d931e..45bd8abfd 100644
--- a/src/main/comments.js
+++ b/src/main/comments.js
@@ -50,16 +50,16 @@ function getSortedChildNodes(node, options, resultArray) {
     (printer.getCommentChildNodes &&
       printer.getCommentChildNodes(node, options)) ||
     (typeof node === "object" &&
-      Object.keys(node)
+      Object.entries(node)
         .filter(
-          (n) =>
+          ([n]) =>
             n !== "enclosingNode" &&
             n !== "precedingNode" &&
             n !== "followingNode" &&
             n !== "tokens" &&
             n !== "comments"
         )
-        .map((n) => node[n]));
+        .map(([, value]) => value));
 
   if (!childNodes) {
     return;
diff --git a/src/main/massage-ast.js b/src/main/massage-ast.js
index f2ce7beb7..784b568e9 100644
--- a/src/main/massage-ast.js
+++ b/src/main/massage-ast.js
@@ -18,9 +18,9 @@ function massageAST(ast, options, parent) {
   }
 
   const newObj = {};
-  for (const key of Object.keys(ast)) {
-    if (!ignoredProperties.has(key) && typeof ast[key] !== "function") {
-      newObj[key] = massageAST(ast[key], options, ast);
+  for (const [key, value] of Object.entries(ast)) {
+    if (!ignoredProperties.has(key) && typeof value !== "function") {
+      newObj[key] = massageAST(value, options, ast);
     }
   }
 
diff --git a/src/main/options.js b/src/main/options.js
index 544f31e26..fecf5834d 100644
--- a/src/main/options.js
+++ b/src/main/options.js
@@ -86,9 +86,9 @@ function normalize(options, opts) {
 
   const mixedDefaults = { ...defaults, ...pluginDefaults };
 
-  for (const k of Object.keys(mixedDefaults)) {
+  for (const [k, value] of Object.entries(mixedDefaults)) {
     if (rawOptions[k] == null) {
-      rawOptions[k] = mixedDefaults[k];
+      rawOptions[k] = value;
     }
   }