process.exit returns empty

Summary: This never returns, so we should be able to use its return value in any context for the purposes of typechecking

Reviewed By: mroch

Differential Revision: D26948380

fbshipit-source-id: 9c89cf424c6e32d4479d947a17a0acf01415b8f5

lib/node.js

@@ -2779,7 +2779,7 @@ declare class Process extends events$EventEmitter {
   ): void;
   execArgv : Array<string>;
   execPath : string;
-  exit(code? : number) : void;
+  exit(code? : number) : empty;
   exitCode? : number;
   getegid? : () => number;
   geteuid? : () => number;