agentsqripts/lib/static-bugs/detectors/null-safety/detectNullSafetyPatterns.js

Comprehensive static code analysis toolkit for identifying technical debt, security vulnerabilities, performance issues, and code quality problems

/**
 * @file Orchestrate null safety detection across multiple analyzers
 * @description Single responsibility: Coordinate comprehensive null safety analysis
 * 
 * This orchestrator module coordinates multiple specialized null safety detectors
 * to provide comprehensive analysis of potential runtime errors. It ensures consistent
 * application of all null safety checks while maintaining separation of concerns
 * between different types of null-related bugs.
 * 
 * Design rationale:
 * - Orchestrator pattern enables adding new detectors without modifying existing code
 * - Separate detectors maintain focused responsibilities for different bug patterns
 * - Spread operator aggregation preserves individual detector results
 * - Consistent interface simplifies integration with main analysis pipeline
 */

const detectNullAccess = require('./detect/detectNullAccess');
const detectUseBeforeInit = require('./detect/detectUseBeforeInit');
const detectTypeCoercion = require('./detect/detectTypeCoercion');

/**
 * Execute comprehensive null safety analysis using multiple specialized detectors
 * 
 * Technical function: Coordinates execution of all null safety detectors and aggregates results
 * 
 * Implementation rationale:
 * - Spread operator efficiently merges arrays from multiple detectors
 * - Sequential execution ensures all detectors run regardless of individual failures
 * - Common interface (ast, filePath) enables consistent detector implementation
 * - Array flattening provides unified result set for downstream processing
 * 
 * Detector coordination strategy:
 * - Each detector focuses on specific null safety patterns for maintainability
 * - Independent execution prevents detector failures from affecting others
 * - Results aggregation preserves all findings for comprehensive reporting
 * - Consistent parameter passing enables shared utility function usage
 * 
 * Null safety coverage areas:
 * - detectNullAccess: Direct null/undefined property access and method calls
 * - detectUseBeforeInit: Variables used before declaration or initialization
 * - detectTypeCoercion: Implicit type conversions that may hide null issues
 * 
 * Performance considerations:
 * - Single AST traversal per detector optimizes parsing overhead
 * - Independent detectors can be parallelized in future optimizations
 * - Result aggregation is O(n) where n is total number of issues found
 * - Memory usage scales linearly with number of detected issues
 * 
 * Error handling strategy:
 * - Detector failures contained within individual functions
 * - Orchestrator continues execution if individual detectors throw exceptions
 * - Empty arrays returned from failed detectors don't break aggregation
 * - Consistent error propagation enables upstream error handling
 * 
 * Extensibility design:
 * - Adding new detectors requires only one line addition to aggregation
 * - Detector interface standardization enables consistent implementation
 * - Result format consistency maintained across all detectors
 * - Module structure supports dependency injection for testing
 * 
 * Alternative approaches considered:
 * - Single monolithic detector: Rejected for maintainability and testing complexity
 * - Event-based aggregation: Rejected as overkill for synchronous analysis
 * - Configurable detector selection: Rejected to maintain consistent analysis coverage
 * 
 * @param {Object} ast - Parsed AST tree for comprehensive static analysis
 * @param {string} filePath - File path for issue location reporting and context
 * @returns {Array<Object>} Aggregated array of all null safety issues found by all detectors
 * @example
 *   // Returns combined results from all detectors:
 *   [
 *     { type: 'null_access', location: 'file.js:10', ... },
 *     { type: 'use_before_init', location: 'file.js:5', ... },
 *     { type: 'type_coercion', location: 'file.js:20', ... }
 *   ]
 */
function detectNullSafetyPatterns(ast, filePath) {
  return [
    ...detectNullAccess(ast, filePath),
    ...detectUseBeforeInit(ast, filePath),
    ...detectTypeCoercion(ast, filePath)
  ];
}

module.exports = detectNullSafetyPatterns;