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Maintain clear code organization by placing code in appropriate files, directories, and modules. Respect module boundaries and create logical directory structures that reflect the code’s purpose and domain.

Key principles:

• Place types in dedicated type files (e.g., move StagehandInitResult to types/evals.ts)
• Create domain-specific directories for related functionality (e.g., lib/a11y for accessibility utilities)
• Respect module boundaries (evals should reference dist, not lib)
• Group related functions in appropriately named files (prompts and prompt building functions belong in prompts.ts)

Example of proper organization:

// Before: accessibility functions mixed in handlers
// lib/handlers/observeHandler.ts
type AccessibilityNode = { ... }
function formatSimplifiedTree() { ... }

// After: dedicated accessibility module  
// lib/a11y/utils.ts
type AccessibilityNode = { ... }
function formatSimplifiedTree() { ... }

This approach improves code discoverability, reduces coupling between modules, and makes the codebase easier to navigate and maintain.