process: refactor lib/internal/bootstrap/node.js

- Use `deprecate` from `internal/util` instead of from `util`
- Split `setupGlobalVariables()` into `setupGlobalProxy()` and
  `setupBuffer()`, and move out manipulation of the process object.

PR-URL: #26033
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/bootstrap/node.js

@@ -40,6 +40,7 @@ const { internalBinding, NativeModule } = loaderExports;
 const { Object, Symbol } = primordials;
 const { getOptionValue } = NativeModule.require('internal/options');
 const config = internalBinding('config');
+const { deprecate } = NativeModule.require('internal/util');
 
 setupTraceCategoryState();
 
@@ -63,7 +64,11 @@ setupProcessObject();
     hasUncaughtExceptionCaptureCallback;
 }
 
-setupGlobalVariables();
+setupGlobalProxy();
+setupBuffer();
+
+process.domain = null;
+process._exiting = false;
 
 // Bootstrappers for all threads, including worker threads and main thread
 const perThreadSetup = NativeModule.require('internal/process/per_thread');
@@ -235,7 +240,6 @@ Object.defineProperty(process, 'allowedNodeEnvironmentFlags', {
   configurable: true
 });
 
-const { deprecate } = NativeModule.require('internal/util');
 // process.assert
 process.assert = deprecate(
   perThreadSetup.assert,
@@ -350,6 +354,13 @@ function setupProcessObject() {
   const origProcProto = Object.getPrototypeOf(process);
   Object.setPrototypeOf(origProcProto, EventEmitter.prototype);
   EventEmitter.call(process);
+  // Make process globally available to users by putting it on the global proxy
+  Object.defineProperty(global, 'process', {
+    value: process,
+    enumerable: false,
+    writable: true,
+    configurable: true
+  });
 }
 
 function setupProcessStdio(getStdout, getStdin, getStderr) {
@@ -377,29 +388,22 @@ function setupProcessStdio(getStdout, getStdin, getStderr) {
   };
 }
 
-function setupGlobalVariables() {
+function setupGlobalProxy() {
   Object.defineProperty(global, Symbol.toStringTag, {
     value: 'global',
     writable: false,
     enumerable: false,
     configurable: true
   });
-  Object.defineProperty(global, 'process', {
-    value: process,
-    enumerable: false,
-    writable: true,
-    configurable: true
-  });
-  const util = NativeModule.require('util');
 
   function makeGetter(name) {
-    return util.deprecate(function() {
+    return deprecate(function() {
       return this;
     }, `'${name}' is deprecated, use 'global'`, 'DEP0016');
   }
 
   function makeSetter(name) {
-    return util.deprecate(function(value) {
+    return deprecate(function(value) {
       Object.defineProperty(this, name, {
         configurable: true,
         writable: true,
@@ -421,7 +425,9 @@ function setupGlobalVariables() {
       set: makeSetter('root')
     }
   });
+}
 
+function setupBuffer() {
   const { Buffer } = NativeModule.require('buffer');
   const bufferBinding = internalBinding('buffer');
 
@@ -436,9 +442,6 @@ function setupGlobalVariables() {
     writable: true,
     configurable: true
   });
-
-  process.domain = null;
-  process._exiting = false;
 }
 
 function setupGlobalTimeouts() {