Summary

This maintenance task addresses multiple SonarCloud code quality findings across the entire codebase by modernizing JavaScript/TypeScript patterns and improving code maintainability. The work involves adopting modern language features, simplifying conditional logic, improving import/export patterns, and fixing logic bugs identified through static analysis. This systematic refactoring will improve code readability, reduce technical debt, and align the codebase with current TypeScript best practices.

Why is this needed?

SonarCloud analysis has identified several categories of code quality issues that impact maintainability and developer experience:

1. Technical Debt: Use of outdated patterns like ternary operators for default values instead of nullish coalescing (??)
2. Code Smells: Redundant conditional logic and unnecessary intermediate variables
3. Maintainability Issues: Inconsistent import/export patterns affecting tree-shaking
4. Logic Bugs: Inverted conditions in console setup logic across Logger and Metrics classes
5. Performance: Inefficient string operations using deprecated methods

Addressing these findings proactively prevents accumulation of technical debt and ensures the codebase remains modern and maintainable as the project scales.

Solution

The solution involves systematic refactoring across multiple categories:

Modern JavaScript/TypeScript Features:

• Replace ternary operators with nullish coalescing (config ?? new Config() instead of config ? config : new Config())
• Use String.raw for regex patterns and replaceAll() instead of global regex replace
• Adopt direct function references (Boolean instead of (value) => Boolean(value))

Code Simplification Examples:

// Before: Redundant ternary
const logLevelValue = logLevelVariable !== '' ? logLevelVariable : logLevelVariableAlias;

// After: Logical OR for falsy values
const logLevelValue = logLevelVariable || logLevelVariableAlias;

// Before: Unnecessary type assertion
item[this.validationKeyAttr] = {
  S: record.payloadHash as string,
};

// After: Direct assignment (type already known)
item[this.validationKeyAttr] = {
  S: record.payloadHash,
};

Import/Export Pattern Improvements:

// Before: Import then re-export
import { logger } from './logger.js';
import { metrics } from './metrics.js';
export { logger, metrics };

// After: Direct re-export for better tree-shaking
export { logger } from './logger.js';
export { metrics } from './metrics.js';

Logic Bug Fixes:

// Before: Inverted condition
if (!isDevMode()) {
  this.console = new Console({...});
} else {
  this.console = console;
}

// After: Correct condition
if (isDevMode()) {
  this.console = console;
} else {
  this.console = new Console({...});
}

Additional Improvements:

• Add NOSONAR comments for intentional code patterns that trigger false positives
• Extract constants to reduce duplication in test factories
• Add proper async/await patterns where needed
• Configure Sonar exclusions for generated proto files

This comprehensive approach addresses current SonarCloud findings while establishing patterns for future development.

Acknowledgment:

• This request meets Powertools for AWS Lambda (TypeScript) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Python, Java, and .NET

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