Fake the fs module so we can spy on it

Author: JoeRobich

test/lsptoolshost/unitTests/migrateOptions.test.ts

@@ -18,6 +18,8 @@ import { getVSCodeWithConfig } from '../../fakes';
 import { CSharpExtensionId } from '../../../src/constants/csharpExtensionId';
 import { ConfigurationTarget } from '../../../src/vscodeAdapter';
 
+jest.mock('fs', () => ({ __esModule: true, ...(<any>jest.requireActual('fs')) }));
+
 describe('Migrate configurations', () => {
     const packageJson = JSON.parse(fs.readFileSync('package.json').toString());
     const configuration = packageJson.contributes.configuration;

tsconfig.json

@@ -8,8 +8,8 @@
             "ES2021"
         ],
         "sourceMap": true,
-        "moduleDetection": "force",
         "moduleResolution": "node",
+        "moduleDetection": "force",
         "strict": true,
         "forceConsistentCasingInFileNames": true,
         "skipLibCheck": true,