diff --git a/packages/react-devtools-extensions/src/__tests__/getHookNameForLocation-test.js b/packages/react-devtools-extensions/src/__tests__/getHookNameForLocation-test.js
index 469bf162b5df0..7b215fc6de787 100644
--- a/packages/react-devtools-extensions/src/__tests__/getHookNameForLocation-test.js
+++ b/packages/react-devtools-extensions/src/__tests__/getHookNameForLocation-test.js
@@ -8,7 +8,7 @@
  */
 
 import {parse} from '@babel/parser';
-import {generateEncodedHookMap, generateHookMap} from '../generateHookMap';
+import {generateHookMap} from '../generateHookMap';
 import {getHookNameForLocation} from '../getHookNameForLocation';
 
 function expectHookMapToEqual(actual, expected) {
diff --git a/packages/react-devtools-extensions/src/__tests__/updateMockSourceMaps.js b/packages/react-devtools-extensions/src/__tests__/updateMockSourceMaps.js
index e6faf915d133f..8e47140811429 100644
--- a/packages/react-devtools-extensions/src/__tests__/updateMockSourceMaps.js
+++ b/packages/react-devtools-extensions/src/__tests__/updateMockSourceMaps.js
@@ -14,7 +14,6 @@ const babel = require('rollup-plugin-babel');
 const commonjs = require('rollup-plugin-commonjs');
 const jsx = require('acorn-jsx');
 const rollupResolve = require('rollup-plugin-node-resolve');
-const {SourceMapConsumer} = require('source-map');
 const {encode, decode} = require('sourcemap-codec');
 const {generateEncodedHookMap} = require('../generateHookMap');
 const {parse} = require('@babel/parser');
diff --git a/packages/react-devtools-extensions/src/astUtils.js b/packages/react-devtools-extensions/src/astUtils.js
index e2bd458d994d6..818ec578a87c5 100644
--- a/packages/react-devtools-extensions/src/astUtils.js
+++ b/packages/react-devtools-extensions/src/astUtils.js
@@ -406,7 +406,8 @@ export function getHookNamesMappingFromAST(
           // Check each reference to the variable declared by the Hook call,
           // and for each, we do the following:
           let declaredVariableName = null;
-          for (const referencePath of referencePaths) {
+          for (let i = 0; i <= referencePaths.length; i++) {
+            const referencePath = referencePaths[i];
             if (declaredVariableName != null) {
               break;
             }
diff --git a/packages/react-devtools-extensions/src/generateHookMap.js b/packages/react-devtools-extensions/src/generateHookMap.js
index 3c1347e0e294e..d57bbb6063854 100644
--- a/packages/react-devtools-extensions/src/generateHookMap.js
+++ b/packages/react-devtools-extensions/src/generateHookMap.js
@@ -7,7 +7,6 @@
  * @flow
  */
 
-import traverse, {Node, NodePath} from '@babel/traverse';
 import {getHookNamesMappingFromAST} from './astUtils';
 import {encode, decode} from 'sourcemap-codec';
 import {File} from '@babel/types';
@@ -65,7 +64,7 @@ export function generateHookMap(sourceAST: File): HookMap {
   const mappings = [];
 
   let currentLine = null;
-  for (const {name, start} of hookNamesMapping) {
+  hookNamesMapping.forEach(({name, start}) => {
     let nameIndex = namesMap.get(name);
     if (nameIndex == null) {
       names.push(name);
@@ -81,14 +80,14 @@ export function generateHookMap(sourceAST: File): HookMap {
     // need this restriction and can remove the -1 at the end.
     const entry = [start.line, start.column, nameIndex, -1];
 
-    if (currentLine != start.line) {
+    if (currentLine !== start.line) {
       currentLine = start.line;
       mappings.push([entry]);
     } else {
       const current = mappings[mappings.length - 1];
       current.push(entry);
     }
-  }
+  });
 
   return {names, mappings};
 }
diff --git a/packages/react-devtools-extensions/src/getHookNameForLocation.js b/packages/react-devtools-extensions/src/getHookNameForLocation.js
index 1fea8c1402135..c65c5fb5a8024 100644
--- a/packages/react-devtools-extensions/src/getHookNameForLocation.js
+++ b/packages/react-devtools-extensions/src/getHookNameForLocation.js
@@ -53,7 +53,7 @@ export function getHookNameForLocation(
   // line, and vice-versa, so if the target line doesn't match the found
   // line, we immediately know that it must correspond to the last mapping
   // entry for that line.
-  if (foundLineNumber != location.line) {
+  if (foundLineNumber !== location.line) {
     foundEntry = foundLine[foundLine.length - 1];
   } else {
     foundEntry = binSearch(location, foundLine, compareColumnPositions);
@@ -71,7 +71,7 @@ export function getHookNameForLocation(
       `Expected to find a name index in the HookMap that covers the target location at line: ${location.line}, column: ${location.column}`,
     );
   }
-  const foundName = hookMap.names[foundNameIndex];
+  const foundName = names[foundNameIndex];
   if (foundName == null) {
     throw new Error(
       `Expected to find a name in the HookMap that covers the target location at line: ${location.line}, column: ${location.column}`,
diff --git a/packages/react-devtools-extensions/src/parseHookNames/parseHookNames.js b/packages/react-devtools-extensions/src/parseHookNames/parseHookNames.js
index 279125c5224e7..9386bd632001b 100644
--- a/packages/react-devtools-extensions/src/parseHookNames/parseHookNames.js
+++ b/packages/react-devtools-extensions/src/parseHookNames/parseHookNames.js
@@ -258,7 +258,7 @@ function extractAndLoadSourceMaps(
               source === 'Inline Babel script' ||
               runtimeSourceURL.endsWith(source),
           );
-          if (sourceIndex != -1) {
+          if (sourceIndex !== -1) {
             const hookMap = extractHookMapFromSourceMap(parsed, sourceIndex);
             if (hookMap != null) {
               hookSourceData.hookMap = hookMap;
@@ -306,7 +306,7 @@ function extractAndLoadSourceMaps(
                 const sourceIndex = parsed.sources.findIndex(source =>
                   runtimeSourceURL.endsWith(source),
                 );
-                if (sourceIndex != -1) {
+                if (sourceIndex !== -1) {
                   const hookMap = extractHookMapFromSourceMap(
                     parsed,
                     sourceIndex,