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Maintain clean code organization by moving implementation details to appropriate locations, extracting reusable functionality, and keeping related code together. This improves maintainability and prevents bugs from poor encapsulation.

Key practices:

• Move implementation details to dedicated modules (e.g., move esbuild utilities to bundle/esbuild.rs)
• Extract repeated patterns into reusable functions instead of duplicating code
• Keep struct definitions close to their implementations for better cohesion
• Use named struct fields instead of tuples for public APIs to improve clarity
• Maintain proper encapsulation by keeping internal details private
• Avoid code duplication by centralizing common utilities (e.g., export shared macros from deno_core)

Example of good organization:

// Instead of inline implementation details
pub async fn bundle() -> Result<(), AnyError> {
  // ... lots of esbuild setup code ...
}

// Extract to dedicated module
// bundle/esbuild.rs
pub async fn ensure_esbuild(...) -> Result<PathBuf, AnyError> {
  // esbuild-specific logic here
}

// bundle/mod.rs  
pub async fn bundle() -> Result<(), AnyError> {
  let esbuild_path = esbuild::ensure_esbuild(...).await?;
  // ... main bundling logic ...
}

This approach makes code easier to test, maintain, and understand by grouping related functionality and separating concerns.