Sealed

Seals a class, preventing it from being extended.

Error is thrown when attempting to instantiate a derived class.

import { sealed } from 'aspectra/utils'
 
@sealed
class Base {}
 
class Derived extends Base {}
 
try {
  new Derived()
} catch (error) {
  console.table(error)
}

[auto-generated] output:

┌─────────┬─────────────────────────────────────────────────────┐
│ (index) │ Values                                              │
├─────────┼─────────────────────────────────────────────────────┤
│ name    │ 'SealedClassExtentionError'                         │
│ message │ 'Class [Base] is sealed but extended by [Derived].' │
└─────────┴─────────────────────────────────────────────────────┘