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analyze_javascript Tool Design Document (Issue #182)

Problem Statement

The current analyze_javascript tool returns a placeholder "not_implemented" response instead of providing comprehensive JavaScript-specific code analysis. This tool needs to analyze JavaScript/TypeScript files for ES version compatibility, async patterns, framework usage, callback complexity, and JavaScript-specific performance patterns to provide actionable insights for JavaScript developers.

Proposed Solution

High-Level Approach

Implement a specialized JavaScript analysis tool that combines multiple JavaScript-specific analysis techniques:

  • ES version detection and compatibility analysis
  • Async pattern analysis (promises vs callbacks, async/await usage)
  • Framework detection (React, Node.js, Express, Vue, Angular)
  • Callback depth analysis and complexity metrics
  • JavaScript performance patterns and optimization opportunities
  • Modern JavaScript best practices validation

Component Architecture

JavaScript Analyzer
├── ES Version Detector
│   ├── Syntax analysis (arrow functions, destructuring, etc.)
│   ├── Feature detection (async/await, optional chaining)
│   └── Compatibility scoring
├── Async Pattern Analyzer  
│   ├── Promise vs callback detection
│   ├── Async/await usage patterns
│   ├── Callback depth measurement
│   └── Event handling patterns
├── Framework Detector
│   ├── React patterns (JSX, hooks, components)
│   ├── Node.js patterns (require, exports, built-ins)
│   ├── Express patterns (app.get, middleware)
│   └── Library usage detection
├── Performance Analyzer
│   ├── DOM manipulation patterns
│   ├── Memory leak indicators
│   ├── Bundle size considerations
│   └── Optimization opportunities
└── Best Practices Validator
    ├── Naming conventions
    ├── Error handling patterns
    ├── Security considerations
    └── Code organization

API Design

Parameters Structure

#[derive(Debug, Clone, Deserialize, schemars::JsonSchema)]
pub struct AnalyzeJavaScriptParams {
    pub target: String,
    pub analysis_types: Option<Vec<String>>, // ["es-version", "async-patterns", "frameworks", "performance", "best-practices"]
    pub es_target: Option<String>, // "ES5", "ES6", "ES2020", "latest"
    pub framework_hints: Option<Vec<String>>, // ["react", "node", "express", "vue"]
    pub include_recommendations: Option<bool>,
    pub detailed_analysis: Option<bool>,
}

Implementation Plan

Phase 1: Core JavaScript Parser Integration

  1. File Detection: Identify JavaScript/TypeScript files (.js, .ts, .jsx, .tsx)
  2. Basic Parsing: Integrate with existing CodePrism parsing infrastructure
  3. AST Analysis: Extract JavaScript-specific syntax trees
  4. Parameter Handling: Implement comprehensive parameter structure

Phase 2: ES Version Analysis

  1. Feature Detection: Map JavaScript features to ES versions
  2. Compatibility Analysis: Check target ES version compatibility
  3. Usage Statistics: Count modern JavaScript feature usage
  4. Recommendation Engine: Suggest upgrades/downgrades based on target

Phase 3: Async Pattern Analysis

  1. Promise Detection: Identify promise usage patterns
  2. Callback Analysis: Measure callback depth and complexity
  3. Async/Await Detection: Find async function patterns
  4. Event Handler Analysis: Analyze event-driven patterns

Phase 4: Framework Detection

  1. React Patterns: JSX, hooks, component patterns
  2. Node.js Patterns: CommonJS, ES modules, built-in usage
  3. Express Patterns: Route handlers, middleware, app configuration
  4. Library Detection: Popular JavaScript library usage

Success Criteria

Functional Requirements

  • ✅ Real Analysis: No "not_implemented" status in responses
  • ✅ ES Version Detection: Accurate ES version and compatibility analysis
  • ✅ Async Patterns: Comprehensive promise vs callback analysis
  • ✅ Framework Detection: React, Node.js, Express pattern recognition
  • ✅ Performance Analysis: JavaScript-specific performance issue detection
  • ✅ Best Practices: Modern JavaScript recommendations

Quality Requirements

  • Accuracy: >85% framework detection confidence
  • Performance: <5s analysis time for typical JavaScript files
  • Coverage: Support for modern JavaScript (ES6+) and TypeScript
  • Usability: Clear, actionable recommendations with examples