Maintain API types

Ensure API type definitions accurately reflect current implementations. When maintaining TypeScript definitions for APIs, regularly audit them against the actual source code to prevent developers from using non-existent or deprecated features.

For API type definitions:

1. Remove outdated type declarations that no longer exist in the implementation
2. Add clear comments for deprecated features or known limitations
3. Document version changes that affect API types

Example:

// INCORRECT: Keeping outdated type definitions
/**
 * This function no longer exists in Express 5.0+
 */
export function query(options: qs.IParseOptions): Handler;

// CORRECT: Properly documenting API changes
/**
 * @deprecated Removed in Express 5.0 (2014-11-06)
 * @see https://github.com/expressjs/express/blob/master/History.md#500-alpha1--2014-11-06
 */
// export function query(options: qs.IParseOptions): Handler;

Accurate type definitions prevent confusion, reduce runtime errors, and improve developer experience when working with your API.