diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index ac04693058..06eb076d26 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -31,6 +31,7 @@
 //                 wwwy3y3 <https://github.com/wwwy3y3>
 //                 Zane Hannan AU <https://github.com/ZaneHannanAU>
 //                 Jeremie Rodriguez <https://github.com/jeremiergz>
+//                 Samuel Ainsworth <https://github.com/samuela>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /** inspector module types */
@@ -2358,42 +2359,42 @@ declare module "child_process" {
         addListener(event: "close", listener: (code: number, signal: string) => void): this;
         addListener(event: "disconnect", listener: () => void): this;
         addListener(event: "error", listener: (err: Error) => void): this;
-        addListener(event: "exit", listener: (code: number, signal: string) => void): this;
+        addListener(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
         addListener(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
 
         emit(event: string | symbol, ...args: any[]): boolean;
         emit(event: "close", code: number, signal: string): boolean;
         emit(event: "disconnect"): boolean;
         emit(event: "error", err: Error): boolean;
-        emit(event: "exit", code: number, signal: string): boolean;
+        emit(event: "exit", code: number | null, signal: string | null): boolean;
         emit(event: "message", message: any, sendHandle: net.Socket | net.Server): boolean;
 
         on(event: string, listener: (...args: any[]) => void): this;
         on(event: "close", listener: (code: number, signal: string) => void): this;
         on(event: "disconnect", listener: () => void): this;
         on(event: "error", listener: (err: Error) => void): this;
-        on(event: "exit", listener: (code: number, signal: string) => void): this;
+        on(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
         on(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
 
         once(event: string, listener: (...args: any[]) => void): this;
         once(event: "close", listener: (code: number, signal: string) => void): this;
         once(event: "disconnect", listener: () => void): this;
         once(event: "error", listener: (err: Error) => void): this;
-        once(event: "exit", listener: (code: number, signal: string) => void): this;
+        once(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
         once(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
 
         prependListener(event: string, listener: (...args: any[]) => void): this;
         prependListener(event: "close", listener: (code: number, signal: string) => void): this;
         prependListener(event: "disconnect", listener: () => void): this;
         prependListener(event: "error", listener: (err: Error) => void): this;
-        prependListener(event: "exit", listener: (code: number, signal: string) => void): this;
+        prependListener(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
         prependListener(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
 
         prependOnceListener(event: string, listener: (...args: any[]) => void): this;
         prependOnceListener(event: "close", listener: (code: number, signal: string) => void): this;
         prependOnceListener(event: "disconnect", listener: () => void): this;
         prependOnceListener(event: "error", listener: (err: Error) => void): this;
-        prependOnceListener(event: "exit", listener: (code: number, signal: string) => void): this;
+        prependOnceListener(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
         prependOnceListener(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
     }