node: add std* file descriptors constants (#46034)

* node: add file descriptors

* adjust types from other modules

types/destroy/destroy-tests.ts

@@ -5,5 +5,5 @@ const stream = fs.createReadStream('package.json');
 
 // $ExpectType ReadStream
 destroy(stream);
-// $ExpectType WriteStream
+// $ExpectType WriteStream & { fd: 2; }
 destroy(process.stderr);

types/minipass/minipass-tests.ts

@@ -35,7 +35,7 @@ mp.end('bar', encoding);
 mp.end('bar', encoding, () => {});
 mp.resume();
 mp.pause();
-mp.pipe(process.stdout); // $ExpectType WriteStream
+mp.pipe(process.stdout); // $ExpectType WriteStream & { fd: 1; }
 
 mp.on('data', chunk => {
     chunk; // $ExpectType any

types/node/process.d.ts

@@ -174,12 +174,18 @@ declare module "process" {
                 /**
                  * Can also be a tty.WriteStream, not typed due to limitations.
                  */
-                stdout: WriteStream;
+                stdout: WriteStream & {
+                    fd: 1;
+                };
                 /**
                  * Can also be a tty.WriteStream, not typed due to limitations.
                  */
-                stderr: WriteStream;
-                stdin: ReadStream;
+                stderr: WriteStream & {
+                    fd: 2;
+                };
+                stdin: ReadStream & {
+                    fd: 0;
+                };
                 openStdin(): Socket;
                 argv: string[];
                 argv0: string;

types/node/test/process.ts

@@ -32,6 +32,10 @@ import { EventEmitter } from "events";
     const listeners = process.listeners('uncaughtException');
     const oldHandler = listeners[listeners.length - 1];
     process.addListener('uncaughtException', oldHandler);
+
+    const stdInFd = process.stdin.fd;
+    const stdOutFd = process.stdout.fd;
+    const stdErrorFd = process.stderr.fd;
 }
 {
     function myCb(err: Error): void {