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Showing content from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cant_delete_private_fields below:

SyntaxError: private fields can't be deleted - JavaScript

SyntaxError: private fields can't be deleted

The JavaScript exception "SyntaxError: private fields can't be deleted" occurs when delete is used on a private element of a class or an object.

Message

SyntaxError: Private fields can not be deleted (V8-based)
SyntaxError: private fields can't be deleted (Firefox)
SyntaxError: Cannot delete private field X (Safari)

Error type What went wrong?

There's code trying to delete a private element (field or method) of an object or a class. This is forbidden by JavaScriptâprivate elements cannot be added or removed on the fly.

Examples

class MyClass {
  #myPrivateField;
  deleteIt() {
    delete this.#myPrivateField; // SyntaxError: private fields can't be deleted
  }
}

class MyClass {
  #myPrivateMethod() {
  }
  #deleteIt() {
    delete this.#myPrivateMethod; // SyntaxError: private fields can't be deleted
  }
}