[node] Add process module definitions (#4491)

* add node process definition

* fix node process tests

definitions/environments/node/flow_v0.155.x-/node.js

@@ -4,6 +4,14 @@ declare module 'fs/promises' {
   declare module.exports: $Exports<'fs'>['promises'];
 }
 
+declare module 'process' {
+  declare module.exports: Process;
+}
+
+declare module 'node:process' {
+  declare module.exports: $Exports<'process'>;
+}
+
 // https://nodejs.org/api/esm.html#node-imports
 
 declare module 'node:events' {

definitions/environments/node/flow_v0.155.x-/test_node.js

@@ -10,6 +10,8 @@ import url from 'url';
 
 import nodeEvents from 'node:events';
 import fsPromises from 'fs/promises';
+import importProcess from 'process';
+import nodeProcess from 'node:process';
 import nodeFs from 'node:fs';
 import nodeFsPromises from 'node:fs/promises';
 import nodeOs from 'node:os';
@@ -30,6 +32,34 @@ describe('node', () => {
     });
   });
 
+  /**
+   * Tested differently as process exports a class
+   */
+  describe('process', () => {
+    it('should retrieve the corresponding Flow core types', () => {
+      const returnValue = process.cwd();
+      (importProcess.cwd(): typeof returnValue);
+      // $FlowExpectedError[incompatible-cast] does not match return type of process function
+      (importProcess.cwd(): number);
+      // $FlowExpectedError[extra-arg] does not match  type of process function
+      (importProcess.cwd(''));
+    });
+  });
+
+  /**
+   * Tested differently as process exports a class
+   */
+  describe('node:process', () => {
+    it('should retrieve the corresponding Flow core types', () => {
+      const returnValue = process.cwd();
+      (nodeProcess.cwd(): typeof returnValue);
+      // $FlowExpectedError[incompatible-cast] does not match return type of process function
+      (nodeProcess.cwd(): number);
+      // $FlowExpectedError[extra-arg] does not match  type of process function
+      (nodeProcess.cwd(''));
+    });
+  });
+
   describe('node:fs', () => {
     it('should retrieve the corresponding Flow core types', () => {
       (nodeFs.writeFile: typeof fs.writeFile);