nestjs: fix skipIfClientUndefined not working in BacktraceModule

packages/nestjs/src/backtrace.module.ts

@@ -40,7 +40,12 @@ const { ConfigurableModuleClass, MODULE_OPTIONS_TOKEN } = new ConfigurableModule
                     (instanceOrOptions instanceof BacktraceClient ? instanceOrOptions : instanceOrOptions?.client) ??
                     BacktraceClient.instance;
 
-                if (!instance) {
+                const skipIfClientUndefined =
+                    instanceOrOptions instanceof BacktraceClient
+                        ? false
+                        : instanceOrOptions?.options?.skipIfClientUndefined;
+
+                if (!instance && !skipIfClientUndefined) {
                     throw new Error(
                         'Backtrace instance is not available. Initialize it first, or pass it into the module using register/registerAsync.',
                     );

packages/nestjs/tests/backtrace.handler.spec.ts

@@ -39,7 +39,11 @@ describe('BacktraceInterceptor', () => {
 
         class Filter extends BaseExceptionFilter {
             catch(exception: unknown, host: ArgumentsHost): void {
-                handler.handleException(exception, host);
+                try {
+                    handler.handleException(exception, host);
+                } catch (err) {
+                    // Do nothing
+                }
                 super.catch(exception, host);
             }
         }
@@ -122,6 +126,57 @@ describe('BacktraceInterceptor', () => {
         expect(send).not.toBeCalled();
     });
 
+    it('should throw if client is uninitialized', async () => {
+        const error = new Error('foo');
+
+        @Controller()
+        class TestController {
+            @Get('error')
+            public error() {
+                throw error;
+            }
+        }
+
+        const interceptor = new BacktraceExceptionHandler({});
+        const handleException = jest.spyOn(interceptor, 'handleException');
+
+        const { app } = await createAppWithHandler(interceptor, TestController);
+
+        await app.init();
+        await request(app.getHttpServer()).get('/error').expect(500);
+
+        const result = handleException.mock.results[0];
+        expect(result.type).toEqual('throw');
+        expect(result.value).toBeInstanceOf(Error);
+        expect(result.value.message).toBe('Backtrace instance is unavailable. Initialize the client first.');
+    });
+
+    it('should not throw if client is uninitialized and skipIfClientUndefined is true', async () => {
+        const error = new Error('foo');
+
+        @Controller()
+        class TestController {
+            @Get('error')
+            public error() {
+                throw error;
+            }
+        }
+
+        const interceptor = new BacktraceExceptionHandler({
+            skipIfClientUndefined: true,
+        });
+        const handleException = jest.spyOn(interceptor, 'handleException');
+
+        const { app } = await createAppWithHandler(interceptor, TestController);
+
+        await app.init();
+        await request(app.getHttpServer()).get('/error').expect(500);
+
+        const result = handleException.mock.results[0];
+        expect(result.type).not.toEqual('throw');
+        expect(result.value).toBe(false);
+    });
+
     describe('include', () => {
         it('should not send when error type is not on include list', async () => {
             const error = new BadRequestException('abc');

packages/nestjs/tests/backtrace.module.spec.ts

@@ -56,4 +56,18 @@ describe('BacktraceModule', () => {
             }).compile(),
         ).rejects.toThrowError(/Backtrace instance is not available\./);
     });
+
+    it('should not throw an error when instance is not initialized and skipIfClientUndefined is true', async () => {
+        await expect(
+            Test.createTestingModule({
+                imports: [
+                    BacktraceModule.register({
+                        options: {
+                            skipIfClientUndefined: true,
+                        },
+                    }),
+                ],
+            }).compile(),
+        ).resolves.not.toThrow();
+    });
 });