Should I use a class with constructor validation or a type with a validation function in Node?

When dealing with validation in Node.js (TypeScript), which is the better pattern in general and why?:

1. Class with validation in the constructor:
   Validation happens when the object is created, ensuring it's always valid.

   class DateRange {  constructor(public startDate: Date, public endDate: Date) {    if (startDate >= endDate) {      throw new Error("startDate must be before endDate");    }  }}

2. Type with a separate validation function:
   Decouples validation from object creation but requires explicit validation.

   type DateRange = { startDate: Date; endDate: Date };function validateDateRange(range: DateRange): boolean {  return range.startDate < range.endDate;}