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style: format all files with prettier
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Seth Hobson
@@ -31,11 +31,13 @@ Transform debugging from frustrating guesswork into systematic problem-solving w
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### 2. Debugging Mindset
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**Don't Assume:**
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- "It can't be X" - Yes it can
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- "I didn't change Y" - Check anyway
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- "It works on my machine" - Find out why
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**Do:**
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- Reproduce consistently
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- Isolate the problem
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- Keep detailed notes
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@@ -153,58 +155,60 @@ Based on gathered info, ask:
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```typescript
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// Chrome DevTools Debugger
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function processOrder(order: Order) {
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debugger; // Execution pauses here
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debugger; // Execution pauses here
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const total = calculateTotal(order);
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console.log('Total:', total);
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const total = calculateTotal(order);
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console.log("Total:", total);
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// Conditional breakpoint
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if (order.items.length > 10) {
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debugger; // Only breaks if condition true
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}
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// Conditional breakpoint
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if (order.items.length > 10) {
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debugger; // Only breaks if condition true
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}
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return total;
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return total;
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}
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// Console debugging techniques
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console.log('Value:', value); // Basic
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console.table(arrayOfObjects); // Table format
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console.time('operation'); /* code */ console.timeEnd('operation'); // Timing
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console.trace(); // Stack trace
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console.assert(value > 0, 'Value must be positive'); // Assertion
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console.log("Value:", value); // Basic
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console.table(arrayOfObjects); // Table format
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console.time("operation");
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/* code */ console.timeEnd("operation"); // Timing
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console.trace(); // Stack trace
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console.assert(value > 0, "Value must be positive"); // Assertion
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// Performance profiling
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performance.mark('start-operation');
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performance.mark("start-operation");
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// ... operation code
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performance.mark('end-operation');
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performance.measure('operation', 'start-operation', 'end-operation');
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console.log(performance.getEntriesByType('measure'));
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performance.mark("end-operation");
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performance.measure("operation", "start-operation", "end-operation");
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console.log(performance.getEntriesByType("measure"));
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```
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**VS Code Debugger Configuration:**
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```json
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// .vscode/launch.json
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{
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"version": "0.2.0",
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"configurations": [
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{
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"type": "node",
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"request": "launch",
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"name": "Debug Program",
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"program": "${workspaceFolder}/src/index.ts",
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"preLaunchTask": "tsc: build - tsconfig.json",
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"outFiles": ["${workspaceFolder}/dist/**/*.js"],
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"skipFiles": ["<node_internals>/**"]
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},
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{
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"type": "node",
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"request": "launch",
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"name": "Debug Tests",
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"program": "${workspaceFolder}/node_modules/jest/bin/jest",
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"args": ["--runInBand", "--no-cache"],
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"console": "integratedTerminal"
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}
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]
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"version": "0.2.0",
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"configurations": [
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{
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"type": "node",
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"request": "launch",
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"name": "Debug Program",
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"program": "${workspaceFolder}/src/index.ts",
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"preLaunchTask": "tsc: build - tsconfig.json",
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"outFiles": ["${workspaceFolder}/dist/**/*.js"],
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"skipFiles": ["<node_internals>/**"]
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},
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{
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"type": "node",
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"request": "launch",
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"name": "Debug Tests",
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"program": "${workspaceFolder}/node_modules/jest/bin/jest",
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"args": ["--runInBand", "--no-cache"],
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"console": "integratedTerminal"
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}
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]
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}
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```
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@@ -332,14 +336,14 @@ Compare working vs broken:
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```markdown
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## What's Different?
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| Aspect | Working | Broken |
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|--------------|-----------------|-----------------|
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| Environment | Development | Production |
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| Node version | 18.16.0 | 18.15.0 |
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| Data | Empty DB | 1M records |
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| User | Admin | Regular user |
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| Browser | Chrome | Safari |
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| Time | During day | After midnight |
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| Aspect | Working | Broken |
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| ------------ | ----------- | -------------- |
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| Environment | Development | Production |
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| Node version | 18.16.0 | 18.15.0 |
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| Data | Empty DB | 1M records |
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| User | Admin | Regular user |
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| Browser | Chrome | Safari |
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| Time | During day | After midnight |
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Hypothesis: Time-based issue? Check timezone handling.
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```
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@@ -348,24 +352,28 @@ Hypothesis: Time-based issue? Check timezone handling.
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```typescript
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// Function call tracing
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function trace(target: any, propertyKey: string, descriptor: PropertyDescriptor) {
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const originalMethod = descriptor.value;
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function trace(
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target: any,
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propertyKey: string,
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descriptor: PropertyDescriptor,
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) {
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const originalMethod = descriptor.value;
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descriptor.value = function(...args: any[]) {
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console.log(`Calling ${propertyKey} with args:`, args);
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const result = originalMethod.apply(this, args);
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console.log(`${propertyKey} returned:`, result);
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return result;
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};
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descriptor.value = function (...args: any[]) {
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console.log(`Calling ${propertyKey} with args:`, args);
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const result = originalMethod.apply(this, args);
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console.log(`${propertyKey} returned:`, result);
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return result;
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};
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return descriptor;
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return descriptor;
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}
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class OrderService {
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@trace
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calculateTotal(items: Item[]): number {
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return items.reduce((sum, item) => sum + item.price, 0);
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}
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@trace
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calculateTotal(items: Item[]): number {
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return items.reduce((sum, item) => sum + item.price, 0);
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}
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}
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```
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@@ -380,26 +388,27 @@ class OrderService {
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// Node.js memory debugging
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if (process.memoryUsage().heapUsed > 500 * 1024 * 1024) {
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console.warn('High memory usage:', process.memoryUsage());
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console.warn("High memory usage:", process.memoryUsage());
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// Generate heap dump
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require('v8').writeHeapSnapshot();
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// Generate heap dump
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require("v8").writeHeapSnapshot();
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}
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// Find memory leaks in tests
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let beforeMemory: number;
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beforeEach(() => {
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beforeMemory = process.memoryUsage().heapUsed;
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beforeMemory = process.memoryUsage().heapUsed;
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});
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afterEach(() => {
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const afterMemory = process.memoryUsage().heapUsed;
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const diff = afterMemory - beforeMemory;
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const afterMemory = process.memoryUsage().heapUsed;
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const diff = afterMemory - beforeMemory;
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if (diff > 10 * 1024 * 1024) { // 10MB threshold
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console.warn(`Possible memory leak: ${diff / 1024 / 1024}MB`);
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}
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if (diff > 10 * 1024 * 1024) {
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// 10MB threshold
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console.warn(`Possible memory leak: ${diff / 1024 / 1024}MB`);
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}
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});
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```
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