TypeScript Error Handling

Applies to: *.ts

Comprehensive error handling patterns for TypeScript applications

typescript

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TypeScript Error Handling

Custom Error Classes

typescript

class AppError extends Error {
  constructor(
    message: string,
    public statusCode: number = 500,
    public isOperational: boolean = true
  ) {
    super(message);
    Object.setPrototypeOf(this, AppError.prototype);
  }
}

Try-Catch Best Practices

Always catch errors in async functions
Use specific error types
Log errors with context
Return proper error responses

Result Type Pattern

typescript

type Result<T, E = Error> = 
  | { ok: true; value: T }
  | { ok: false; error: E };

function divide(a: number, b: number): Result<number> {
  if (b === 0) {
    return { ok: false, error: new Error('Division by zero') };
  }
  return { ok: true, value: a / b };
}