diff --git a/lib/fs.js b/lib/fs.js
index 84b51b378cf534..04b7a190998bd5 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -254,7 +254,7 @@ function exists(path, callback) {
   validateFunction(callback, 'cb');
 
   function suppressedCallback(err) {
-    callback(err ? false : true);
+    callback(!err);
   }
 
   try {
@@ -750,8 +750,8 @@ function readSync(fd, buffer, offsetOrOptions, length, position) {
  * @param {(
  *   err?: Error,
  *   bytesRead?: number,
- *   buffers?: ArrayBufferView[];
- *   ) => any} callback
+ *   buffers?: ArrayBufferView[]
+ * ) => any} callback
  * @returns {void}
  */
 function readv(fd, buffers, position, callback) {
@@ -804,9 +804,9 @@ function readvSync(fd, buffers, position) {
  * @param {number | null} [position]
  * @param {(
  *   err?: Error,
- *   bytesWritten?: number;
+ *   bytesWritten?: number,
  *   buffer?: Buffer | TypedArray | DataView
- *   ) => any} callback
+ * ) => any} callback
  * @returns {void}
  */
 function write(fd, buffer, offsetOrOptions, length, position, callback) {
@@ -882,6 +882,8 @@ ObjectDefineProperty(write, kCustomPromisifyArgsSymbol,
  *   length?: number;
  *   position?: number | null;
  *   }} [offsetOrOptions]
+ * @param {number} [length]
+ * @param {number} [position]
  * @returns {number}
  */
 function writeSync(fd, buffer, offsetOrOptions, length, position) {
@@ -1073,14 +1075,11 @@ function truncateSync(path, len) {
   }
   // Allow error to be thrown, but still close fd.
   const fd = fs.openSync(path, 'r+');
-  let ret;
-
   try {
-    ret = fs.ftruncateSync(fd, len);
+    fs.ftruncateSync(fd, len);
   } finally {
     fs.closeSync(fd);
   }
-  return ret;
 }
 
 /**
@@ -1441,9 +1440,9 @@ function readdirSyncRecursive(basePath, options) {
  *   recursive?: boolean;
  *   }} [options]
  * @param {(
- *   err?: Error;
- *   files?: string[] | Buffer[] | Dirent[];
- *   ) => any} callback
+ *   err?: Error,
+ *   files?: string[] | Buffer[] | Dirent[]
+ * ) => any} callback
  * @returns {void}
  */
 function readdir(path, options, callback) {
@@ -1943,13 +1942,11 @@ function lchmodSync(path, mode) {
 
   // Prefer to return the chmod error, if one occurs,
   // but still try to close, and report closing errors if they occur.
-  let ret;
   try {
-    ret = fs.fchmodSync(fd, mode);
+    fs.fchmodSync(fd, mode);
   } finally {
     fs.closeSync(fd);
   }
-  return ret;
 }
 
 /**
@@ -2814,7 +2811,7 @@ function realpath(p, options, callback) {
 
   // On windows, check that the root exists. On unix there is no need.
   if (isWindows && !knownHard.has(base)) {
-    fs.lstat(base, (err, stats) => {
+    fs.lstat(base, (err) => {
       if (err) return callback(err);
       knownHard.add(base);
       LOOP();
diff --git a/typings/internalBinding/fs.d.ts b/typings/internalBinding/fs.d.ts
index 05b535daf3bf26..db8eac020ea717 100644
--- a/typings/internalBinding/fs.d.ts
+++ b/typings/internalBinding/fs.d.ts
@@ -57,7 +57,7 @@ declare namespace InternalFSBinding {
   }
 
   function access(path: StringOrBuffer, mode: number, req: FSReqCallback): void;
-  function access(path: StringOrBuffer, mode: number, req: undefined, ctx: FSSyncContext): void;
+  function access(path: StringOrBuffer, mode: number): void;
   function access(path: StringOrBuffer, mode: number, usePromises: typeof kUsePromises): Promise<void>;
 
   function chmod(path: string, mode: number, req: FSReqCallback): void;
@@ -70,7 +70,7 @@ declare namespace InternalFSBinding {
   function chown(path: string, uid: number, gid: number): void;
 
   function close(fd: number, req: FSReqCallback): void;
-  function close(fd: number, req: undefined, ctx: FSSyncContext): void;
+  function close(fd: number): void;
 
   function copyFile(src: StringOrBuffer, dest: StringOrBuffer, mode: number, req: FSReqCallback): void;
   function copyFile(src: StringOrBuffer, dest: StringOrBuffer, mode: number, req: undefined, ctx: FSSyncContext): void;
@@ -153,7 +153,7 @@ declare namespace InternalFSBinding {
   function mkdir(path: string, mode: number, recursive: false, usePromises: typeof kUsePromises): Promise<void>;
 
   function open(path: StringOrBuffer, flags: number, mode: number, req: FSReqCallback<number>): void;
-  function open(path: StringOrBuffer, flags: number, mode: number, req: undefined, ctx: FSSyncContext): number;
+  function open(path: StringOrBuffer, flags: number, mode: number): number;
 
   function openFileHandle(path: StringOrBuffer, flags: number, mode: number, usePromises: typeof kUsePromises): Promise<FileHandle>;
 
@@ -175,6 +175,8 @@ declare namespace InternalFSBinding {
   function readdir(path: StringOrBuffer, encoding: unknown, withFileTypes: true, usePromises: typeof kUsePromises): Promise<[string[], number[]]>;
   function readdir(path: StringOrBuffer, encoding: unknown, withFileTypes: false, usePromises: typeof kUsePromises): Promise<string[]>;
 
+  function readFileUtf8(path: StringOrBuffer, flags: number): string;
+
   function readlink(path: StringOrBuffer, encoding: unknown, req: FSReqCallback<string | Buffer>): void;
   function readlink(path: StringOrBuffer, encoding: unknown, req: undefined, ctx: FSSyncContext): string | Buffer;
   function readlink(path: StringOrBuffer, encoding: unknown, usePromises: typeof kUsePromises): Promise<string | Buffer>;
@@ -272,6 +274,7 @@ export interface FsBinding {
   read: typeof InternalFSBinding.read;
   readBuffers: typeof InternalFSBinding.readBuffers;
   readdir: typeof InternalFSBinding.readdir;
+  readFileUtf8: typeof InternalFSBinding.readFileUtf8;
   readlink: typeof InternalFSBinding.readlink;
   realpath: typeof InternalFSBinding.realpath;
   rename: typeof InternalFSBinding.rename;