javascript エラー「Uncaught TypeError: Cannot add property xxx, object is not extensible」の解決方法

'use strict';

const person = {
  name: 'tanaka'
};

Object.preventExtensions(person);

person.age = 25;

Uncaught TypeError: Cannot add property age, object is not extensible

Uncaught TypeError: can't define property "age": Object is not extensible

'use strict';

const person = {
  name: 'tanaka'
};

person.age = 25;

Object.preventExtensions(person);

'use strict';

const person = {
  name: 'tanaka'
};

Object.preventExtensions(person);

if(Object.isExtensible(person)){
  person.age = 25;
}