Add npm registry URL rewriting and improve formatting

Introduces logic to rewrite npm registry tarball URLs in JSON responses to route through the proxy endpoint, ensuring package names are preserved. Also improves code formatting and consistency across source and test files, and adds related test cases for npm URL rewriting.

test/performance.test.js

@@ -34,7 +34,7 @@ describe('Performance Monitoring', () => {
 
     it('should create timing marks', () => {
       monitor.mark('test-mark');
-      
+
       const metrics = monitor.getMetrics();
       expect(metrics).toHaveProperty('test-mark');
       expect(typeof metrics['test-mark']).toBe('number');
@@ -44,7 +44,7 @@ describe('Performance Monitoring', () => {
       monitor.mark('mark1');
       monitor.mark('mark2');
       monitor.mark('mark3');
-      
+
       const metrics = monitor.getMetrics();
       expect(Object.keys(metrics)).toHaveLength(3);
       expect(metrics).toHaveProperty('mark1');
@@ -57,19 +57,19 @@ describe('Performance Monitoring', () => {
       const originalWarn = console.warn;
       const mockWarn = vi ? vi.fn() : jest.fn();
       console.warn = mockWarn;
-      
+
       monitor.mark('duplicate');
       monitor.mark('duplicate');
-      
+
       expect(mockWarn).toHaveBeenCalledWith('Mark with name duplicate already exists.');
-      
+
       // Restore original console.warn
       console.warn = originalWarn;
     });
 
     it('should return metrics as plain object', () => {
       monitor.mark('test');
-      
+
       const metrics = monitor.getMetrics();
       expect(metrics).toBeTypeOf('object');
       expect(Array.isArray(metrics)).toBe(false);
@@ -77,12 +77,12 @@ describe('Performance Monitoring', () => {
 
     it('should track elapsed time correctly', async () => {
       monitor.mark('start');
-      
+
       // Wait a small amount of time
       await new Promise(resolve => setTimeout(resolve, 10));
-      
+
       monitor.mark('end');
-      
+
       const metrics = monitor.getMetrics();
       expect(metrics.end).toBeGreaterThan(metrics.start);
     });
@@ -94,18 +94,18 @@ describe('Performance Monitoring', () => {
       monitor.mark('proxy-start');
       monitor.mark('proxy-end');
       monitor.mark('request-end');
-      
+
       const metrics = monitor.getMetrics();
-      
+
       expect(() => JSON.stringify(metrics)).not.toThrow();
     });
 
     it('should have reasonable timing values', () => {
       monitor.mark('test-mark');
-      
+
       const metrics = monitor.getMetrics();
       const timing = metrics['test-mark'];
-      
+
       // Should be a positive number and reasonable (less than 1 second for this test)
       expect(timing).toBeGreaterThanOrEqual(0);
       expect(timing).toBeLessThan(1000);
@@ -117,9 +117,9 @@ describe('Performance Monitoring', () => {
       monitor.mark('second');
       await new Promise(resolve => setTimeout(resolve, 5));
       monitor.mark('third');
-      
+
       const metrics = monitor.getMetrics();
-      
+
       expect(metrics.first).toBeLessThan(metrics.second);
       expect(metrics.second).toBeLessThan(metrics.third);
     });
@@ -133,9 +133,9 @@ describe('Performance Monitoring', () => {
       monitor.mark('proxy-start');
       monitor.mark('proxy-response');
       monitor.mark('response-sent');
-      
+
       const metrics = monitor.getMetrics();
-      
+
       expect(metrics).toHaveProperty('request-received');
       expect(metrics).toHaveProperty('validation-complete');
       expect(metrics).toHaveProperty('proxy-start');
@@ -148,9 +148,9 @@ describe('Performance Monitoring', () => {
       monitor.mark('cache-miss');
       monitor.mark('upstream-request');
       monitor.mark('cache-store');
-      
+
       const metrics = monitor.getMetrics();
-      
+
       expect(metrics).toHaveProperty('cache-check-start');
       expect(metrics).toHaveProperty('cache-miss');
       expect(metrics).toHaveProperty('upstream-request');
@@ -161,9 +161,9 @@ describe('Performance Monitoring', () => {
       monitor.mark('request-start');
       monitor.mark('error-occurred');
       monitor.mark('error-handled');
-      
+
       const metrics = monitor.getMetrics();
-      
+
       expect(metrics).toHaveProperty('request-start');
       expect(metrics).toHaveProperty('error-occurred');
       expect(metrics).toHaveProperty('error-handled');
@@ -173,24 +173,24 @@ describe('Performance Monitoring', () => {
   describe('Performance Thresholds', () => {
     it('should identify slow operations', () => {
       monitor.mark('operation-start');
-      
+
       // Simulate slow operation
       const slowTiming = 5000; // 5 seconds
       monitor.marks.set('operation-end', slowTiming);
-      
+
       const metrics = monitor.getMetrics();
       const operationTime = metrics['operation-end'] - (metrics['operation-start'] || 0);
-      
+
       // Should identify as slow (> 1 second)
       expect(operationTime).toBeGreaterThan(1000);
     });
 
     it('should identify fast operations', () => {
       monitor.mark('fast-operation');
-      
+
       const metrics = monitor.getMetrics();
       const timing = metrics['fast-operation'];
-      
+
       // Should be fast (< 100ms for this test)
       expect(timing).toBeLessThan(100);
     });
@@ -199,14 +199,14 @@ describe('Performance Monitoring', () => {
   describe('Memory and Resource Usage', () => {
     it('should not leak memory with many marks', () => {
       const initialSize = monitor.marks.size;
-      
+
       // Add many marks
       for (let i = 0; i < 1000; i++) {
         monitor.mark(`mark-${i}`);
       }
-      
+
       expect(monitor.marks.size).toBe(initialSize + 1000);
-      
+
       // Clear marks (if such method existed)
       monitor.marks.clear();
       expect(monitor.marks.size).toBe(0);
@@ -214,7 +214,7 @@ describe('Performance Monitoring', () => {
 
     it('should handle concurrent mark operations', () => {
       const promises = [];
-      
+
       for (let i = 0; i < 10; i++) {
         promises.push(
           new Promise(resolve => {
@@ -225,11 +225,11 @@ describe('Performance Monitoring', () => {
           })
         );
       }
-      
+
       return Promise.all(promises).then(() => {
         const metrics = monitor.getMetrics();
         expect(Object.keys(metrics)).toHaveLength(10);
       });
     });
   });
-});
+});