diff --git a/client/src/templates/Challenges/classic/MultifileEditor.js b/client/src/templates/Challenges/classic/MultifileEditor.js
index 934058f2c8..3c84b66853 100644
--- a/client/src/templates/Challenges/classic/MultifileEditor.js
+++ b/client/src/templates/Challenges/classic/MultifileEditor.js
@@ -9,7 +9,7 @@ import {
   consoleOutputSelector,
   visibleEditorsSelector
 } from '../redux';
-import { getTargetEditor } from '../utils/getTargetEditor';
+import { getTargetEditor } from '../utils/get-target-editor';
 import './editor.css';
 import Editor from './editor';
 
diff --git a/client/src/templates/Challenges/redux/index.js b/client/src/templates/Challenges/redux/index.js
index 2338732bcf..a001611f01 100644
--- a/client/src/templates/Challenges/redux/index.js
+++ b/client/src/templates/Challenges/redux/index.js
@@ -4,7 +4,7 @@ import { createAction, handleActions } from 'redux-actions';
 import { getLines } from '../../../../../utils/get-lines';
 import { challengeTypes } from '../../../../utils/challenge-types';
 import { completedChallengesSelector } from '../../../redux';
-import { getTargetEditor } from '../utils/getTargetEditor';
+import { getTargetEditor } from '../utils/get-target-editor';
 import { actionTypes, ns } from './action-types';
 import codeLockEpic from './code-lock-epic';
 import codeStorageEpic from './code-storage-epic';
diff --git a/client/src/templates/Challenges/utils/get-target-editor.ts b/client/src/templates/Challenges/utils/get-target-editor.ts
new file mode 100644
index 0000000000..d37f580def
--- /dev/null
+++ b/client/src/templates/Challenges/utils/get-target-editor.ts
@@ -0,0 +1,17 @@
+import { isEmpty } from 'lodash-es';
+import { sortChallengeFiles } from '../../../../../utils/sort-challengefiles';
+import { ChallengeFiles, FileKey } from '../../../redux/prop-types';
+
+export function getTargetEditor(
+  challengeFiles: ChallengeFiles
+): FileKey | null {
+  if (isEmpty(challengeFiles)) return null;
+
+  const targetEditor = challengeFiles?.find(
+    ({ editableRegionBoundaries }) => !isEmpty(editableRegionBoundaries)
+  )?.fileKey;
+
+  // fallback for when there is no editable region.
+  /* eslint-disable-next-line @typescript-eslint/no-unsafe-member-access, @typescript-eslint/no-unsafe-return */
+  return targetEditor || sortChallengeFiles(challengeFiles)[0].fileKey;
+}
diff --git a/client/src/templates/Challenges/utils/getTargetEditor.js b/client/src/templates/Challenges/utils/getTargetEditor.js
deleted file mode 100644
index d0c9a6bc8a..0000000000
--- a/client/src/templates/Challenges/utils/getTargetEditor.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import { isEmpty } from 'lodash-es';
-import { sortChallengeFiles } from '../../../../../utils/sort-challengefiles';
-
-export function getTargetEditor(challengeFiles) {
-  if (isEmpty(challengeFiles)) return null;
-  else {
-    let targetEditor = challengeFiles.find(
-      ({ editableRegionBoundaries }) => !isEmpty(editableRegionBoundaries)
-    )?.fileKey;
-
-    // fallback for when there is no editable region.
-    return targetEditor || sortChallengeFiles(challengeFiles)[0].fileKey;
-  }
-}