Instruction: Discuss strategies for writing exception handling code in TypeScript that maintains type safety.
Context: This question tests the candidate's ability to implement robust error handling mechanisms in TypeScript, ensuring exceptions are managed in a type-safe manner.
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First, leveraging TypeScript's strong typing system to define custom error classes is a foundational step. By extending the native Error class, you can create specific error types for different parts of your application. This approach not only makes the code more readable but also ensures that errors can be caught and handled specifically according to their type. For instance, defining a DatabaseError class for errors related to database operations, and a ValidationError class for errors occurring from data validation. This method allows for fine-grained control over error handling, ensuring that each error type can be caught and processed accordingly.
typescript class DatabaseError extends Error { constructor(message: string) { super(message); this.name = "DatabaseError"; } }...