Handles the conversion of HTML nodes to Markdown format.

This module is responsible for transforming parsed HTML nodes into their Markdown equivalents. It uses an efficient IOList-based approach for building the output string.

Implementation Details

The converter uses pattern matching to handle different HTML elements:

• Headers (h1-h6) → Markdown headers with appropriate # prefixes
• Text formatting (strong, em, del) → Markdown emphasis markers
• Lists (ul, ol) → Markdown list syntax with proper nesting
• Tables → Delegated to Html2Markdown.TableConverter
• Links and images → Markdown link syntax
• Code blocks → Fenced code blocks with language detection

Performance Optimizations

• Uses IOList building instead of string concatenation
• Processes nodes in a single pass
• Preserves whitespace in code blocks while normalizing elsewhere