diff --git a/node/node.d.ts b/node/node.d.ts
index 7aa5964838..a57fb96d13 100644
--- a/node/node.d.ts
+++ b/node/node.d.ts
@@ -752,33 +752,33 @@ declare module "fs" {
     export function truncate(path: string, callback?: Function): void;
     export function truncate(path: string, len: number, callback?: Function): void;
     export function truncateSync(path: string, len?: number): void;
-    export function ftruncate(fd: string, callback?: Function): void;
-    export function ftruncate(fd: string, len: number, callback?: Function): void;
-    export function ftruncateSync(fd: string, len?: number): void;
+    export function ftruncate(fd: number, callback?: Function): void;
+    export function ftruncate(fd: number, len: number, callback?: Function): void;
+    export function ftruncateSync(fd: number, len?: number): void;
     export function chown(path: string, uid: number, gid: number, callback?: Function): void;
     export function chownSync(path: string, uid: number, gid: number): void;
-    export function fchown(fd: string, uid: number, gid: number, callback?: Function): void;
-    export function fchownSync(fd: string, uid: number, gid: number): void;
+    export function fchown(fd: number, uid: number, gid: number, callback?: Function): void;
+    export function fchownSync(fd: number, uid: number, gid: number): void;
     export function lchown(path: string, uid: number, gid: number, callback?: Function): void;
     export function lchownSync(path: string, uid: number, gid: number): void;
     export function chmod(path: string, mode: number, callback?: Function): void;
     export function chmod(path: string, mode: string, callback?: Function): void;
     export function chmodSync(path: string, mode: number): void;
     export function chmodSync(path: string, mode: string): void;
-    export function fchmod(fd: string, mode: number, callback?: Function): void;
-    export function fchmod(fd: string, mode: string, callback?: Function): void;
-    export function fchmodSync(fd: string, mode: number): void;
-    export function fchmodSync(fd: string, mode: string): void;
+    export function fchmod(fd: number, mode: number, callback?: Function): void;
+    export function fchmod(fd: number, mode: string, callback?: Function): void;
+    export function fchmodSync(fd: number, mode: number): void;
+    export function fchmodSync(fd: number, mode: string): void;
     export function lchmod(path: string, mode: number, callback?: Function): void;
     export function lchmod(path: string, mode: string, callback?: Function): void;
     export function lchmodSync(path: string, mode: number): void;
     export function lchmodSync(path: string, mode: string): void;
     export function stat(path: string, callback?: (err: Error, stats: Stats) => any): void;
     export function lstat(path: string, callback?: (err: Error, stats: Stats) => any): void;
-    export function fstat(fd: string, callback?: (err: Error, stats: Stats) => any): void;
+    export function fstat(fd: number, callback?: (err: Error, stats: Stats) => any): void;
     export function statSync(path: string): Stats;
     export function lstatSync(path: string): Stats;
-    export function fstatSync(fd: string): Stats;
+    export function fstatSync(fd: number): Stats;
     export function link(srcpath: string, dstpath: string, callback?: Function): void;
     export function linkSync(srcpath: string, dstpath: string): void;
     export function symlink(srcpath: string, dstpath: string, type?: string, callback?: Function): void;
@@ -799,23 +799,23 @@ declare module "fs" {
     export function mkdirSync(path: string, mode?: string): void;
     export function readdir(path: string, callback?: (err: Error, files: string[]) => void): void;
     export function readdirSync(path: string): string[];
-    export function close(fd: string, callback?: Function): void;
-    export function closeSync(fd: string): void;
-    export function open(path: string, flags: string, callback?: (err: Error, fd: string) => any): void;
-    export function open(path: string, flags: string, mode: number, callback?: (err: Error, fd: string) => any): void;
-    export function open(path: string, flags: string, mode: string, callback?: (err: Error, fd: string) => any): void;
-    export function openSync(path: string, flags: string, mode?: number): void;
-    export function openSync(path: string, flags: string, mode?: string): void;
+    export function close(fd: number, callback?: Function): void;
+    export function closeSync(fd: number): void;
+    export function open(path: string, flags: string, callback?: (err: Error, fd: number) => any): void;
+    export function open(path: string, flags: string, mode: number, callback?: (err: Error, fd: number) => any): void;
+    export function open(path: string, flags: string, mode: string, callback?: (err: Error, fd: number) => any): void;
+    export function openSync(path: string, flags: string, mode?: number): number;
+    export function openSync(path: string, flags: string, mode?: string): number;
     export function utimes(path: string, atime: number, mtime: number, callback?: Function): void;
     export function utimesSync(path: string, atime: number, mtime: number): void;
-    export function futimes(fd: string, atime: number, mtime: number, callback?: Function): void;
-    export function futimesSync(fd: string, atime: number, mtime: number): void;
-    export function fsync(fd: string, callback?: Function): void;
-    export function fsyncSync(fd: string): void;
-    export function write(fd: string, buffer: NodeBuffer, offset: number, length: number, position: number, callback?: (err: Error, written: number, buffer: NodeBuffer) =>any): void;
-    export function writeSync(fd: string, buffer: NodeBuffer, offset: number, length: number, position: number): void;
-    export function read(fd: string, buffer: NodeBuffer, offset: number, length: number, position: number, callback?: (err: Error, bytesRead: number, buffer: NodeBuffer) => void): void;
-    export function readSync(fd: string, buffer: NodeBuffer, offset: number, length: number, position: number): any[];
+    export function futimes(fd: number, atime: number, mtime: number, callback?: Function): void;
+    export function futimesSync(fd: number, atime: number, mtime: number): void;
+    export function fsync(fd: number, callback?: Function): void;
+    export function fsyncSync(fd: number): void;
+    export function write(fd: number, buffer: NodeBuffer, offset: number, length: number, position: number, callback?: (err: Error, written: number, buffer: NodeBuffer) => void): void;
+    export function writeSync(fd: number, buffer: NodeBuffer, offset: number, length: number, position: number): number;
+    export function read(fd: number, buffer: NodeBuffer, offset: number, length: number, position: number, callback?: (err: Error, bytesRead: number, buffer: NodeBuffer) => void): void;
+    export function readSync(fd: number, buffer: NodeBuffer, offset: number, length: number, position: number): number;
     export function readFile(filename: string, options: { encoding?: string; flag?: string; }, callback: (err: Error, data: any) => void): void;
     export function readFile(filename: string, callback: (err: Error, data: NodeBuffer) => void ): void;
     export function readFileSync(filename: string, options?: { flag?: string; }): NodeBuffer;
@@ -830,11 +830,11 @@ declare module "fs" {
     export function appendFile(filename: string, data: any, callback?: (err: Error) => void): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
-    export function watchFile(filename: string, listener: (curr: Stats, prev: Stats)=>void): void;
-    export function watchFile(filename: string, options: { persistent?: boolean; interval?: number; }, listener: (curr: Stats, prev: Stats)=>void): void;
-    export function unwatchFile(filename: string, listener?: (curr: Stats, prev: Stats)=>void): void;
-    export function watch(filename: string, listener?: (event: string, filename: string) =>any): FSWatcher;
-    export function watch(filename: string, options: { persistent?: boolean; }, listener?: (event: string, filename: string) =>any): FSWatcher;
+    export function watchFile(filename: string, listener: (curr: Stats, prev: Stats) => void): void;
+    export function watchFile(filename: string, options: { persistent?: boolean; interval?: number; }, listener: (curr: Stats, prev: Stats) => void): void;
+    export function unwatchFile(filename: string, listener?: (curr: Stats, prev: Stats) => void): void;
+    export function watch(filename: string, listener?: (event: string, filename: string) => any): FSWatcher;
+    export function watch(filename: string, options: { persistent?: boolean; }, listener?: (event: string, filename: string) => any): FSWatcher;
     export function exists(path: string, callback?: (exists: boolean) => void): void;
     export function existsSync(path: string): boolean;
     export function createReadStream(path: string, options?: {
@@ -1142,7 +1142,7 @@ declare module "assert" {
 declare module "tty" {
     import net = require("net");
 
-    export function isatty(fd: string): boolean;
+    export function isatty(fd: number): boolean;
     export interface ReadStream extends net.NodeSocket {
         isRaw: boolean;
         setRawMode(mode: boolean): void;