fix(circuit): disable circuit breaker in development

__tests__/server/utils/createCircuitBreaker.spec.js

@@ -35,6 +35,7 @@ describe('Circuit breaker', () => {
   const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => 0);
 
   beforeEach(() => {
+    process.env.NODE_ENV = 'production';
     setEventLoopDelayThreshold();
     mockCircuitBreaker.close();
     jest.clearAllMocks();
@@ -64,6 +65,19 @@ describe('Circuit breaker', () => {
     expect(value).toBe(true);
   });
 
+  it('should not open the circuit when in development environment', async () => {
+    process.env.NODE_ENV = 'development';
+    expect.assertions(2);
+    setEventLoopDelayThreshold(-1);
+    jest.advanceTimersByTime(510);
+    // Need to fire the breaker once before it will open
+    await mockCircuitBreaker.fire('hola, mundo');
+    jest.clearAllMocks();
+    const value = await mockCircuitBreaker.fire('hola, mundo');
+    expect(asyncFuntionThatMightFail).toHaveBeenCalled();
+    expect(value).toBe(false);
+  });
+
   it('should not open the circuit when the root module is not loaded', async () => {
     expect.assertions(2);
     getModule.mockReturnValueOnce(false);

docs/api/modules/App-Configuration.md

@@ -452,6 +452,8 @@ if (!global.BROWSER) {
 
 The `eventLoopDelayThreshold` directive accepts a number representing the threshold of the event loop delay (in milliseconds) before opening the circuit. Once the circuit is open, it will remain open for 10 seconds and close at that time pending the event loop delay. The default value is `250`. If you desire to disable the event loop delay potion of the circuit breaker, set this value to `Infinity`. The circuit will also open if the error rate exceeds 10%. In practice, `eventLoopDelayThreshold` allows for tuning server side rendering (SSR) of Modules. We may increase request throughput by temporarily disabling SSR at high load through event loop delay monitoring.
 
+> This is disabled when NODE_ENV=development
+
 **📘 More Information**
 * [Frank Lloyd Root's `appConfig`](../../../prod-sample/sample-modules/frank-lloyd-root/0.0.0/src/config.js)
 * Library: [Opossum](https://nodeshift.dev/opossum/)

src/server/utils/createCircuitBreaker.js

@@ -42,6 +42,7 @@ const eventLoopDelayHistogram = monitorEventLoopDelay();
 eventLoopDelayHistogram.enable();
 
 const checkMaxEventLoopDelay = async () => {
+  if (process.env.NODE_ENV === 'development') return;
   // Return if root module is not loaded, as that is where threshold is configured
   if (!getModule(rootModuleName)) return;
   // Get event loop delay in milliseconds (from nanoseconds)