Summary

• Implemented edge-compatible logger with environment-aware log levels
• Created comprehensive error handling utilities with HTTP status mapping
• Built validation utilities for input sanitization and security
• Added ID generation using nanoid with various formats
• Created centralized environment detection for edge runtime

Implementation Details

Logger (lib/logger.ts)

• Environment-aware logging (debug/info only in development)
• Child logger support for context-specific logging
• Structured log format with timestamps
• Edge runtime compatible (no Node.js dependencies)

Error Handling (lib/errors.ts)

• Custom error classes for all application error types
• HTTP status code mapping
• Error response formatting for API routes
• Async handler wrapper with automatic error catching

Validation (lib/validation.ts)

• Input sanitization for strings and HTML
• Filename validation with security checks
• PIN validation (alphanumeric with special chars)
• Size and count validation for files/gists
• ISO date validation and expiry checking
• URL and content type validation

ID Generation (lib/id.ts)

• Multiple ID formats (standard, readable, short, prefixed)
• Timestamp-based IDs for sorting
• Version IDs for gist versions
• Collision-resistant unique ID generation

Environment Detection (lib/environment.ts)

• Build-time environment detection (replaced at build)
• Runtime environment detection for Cloudflare Workers
• Centralized logic used across all utilities

Test Coverage

All utilities have comprehensive test coverage:

• ✅ Logger: 12 tests
• ✅ Errors: 23 tests
• ✅ Validation: 40 tests
• ✅ ID Generation: 21 tests
• ✅ Environment: 8 tests

Total: 104 tests, all passing

Breaking Changes

None - this is new functionality

Checklist

• All tests pass
• ESLint and TypeScript checks pass
• Documentation added (JSDoc comments)
• Edge runtime compatible
• No Node.js dependencies

Closes #28

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