fix: Clear generated env directory before shim generation

Author: vigy02

packages/backend-function/src/function_env_type_generator.test.ts

@@ -8,7 +8,7 @@ import path from 'path';
 
 void describe('FunctionEnvironmentTypeGenerator', () => {
   beforeEach(() => {
-    resetFactoryCount();
+    resetFactoryGlobalState();
   });
   void it('generates a type definition file', () => {
     const fsOpenSyncMock = mock.method(fs, 'openSync');
@@ -125,7 +125,7 @@ void describe('FunctionEnvironmentTypeGenerator', () => {
     fsExistsSyncMock.mock.restore();
     fsRmSyncMock.mock.restore();
   });
-  const resetFactoryCount = () => {
+  const resetFactoryGlobalState = () => {
     FunctionEnvironmentTypeGenerator.isEnvDirectoryInitialized = false;
   };
 });

packages/backend-function/src/function_env_type_generator.ts

@@ -7,7 +7,7 @@ import { EOL } from 'os';
  * Generates a typed process.env shim for environment variables
  */
 export class FunctionEnvironmentTypeGenerator {
-  // Using this to ensure directory is cleared once
+  // Using this to ensure directory is cleared once per synthesis
   static isEnvDirectoryInitialized = false;
   private readonly header =
     '// This file is auto-generated by Amplify. Edits will be overwritten.';