TypeError: Cannot assign to read only property

Co powoduje ten błąd

The object was frozen with Object.freeze(), sealed with Object.seal(), or the property was defined with writable: false via Object.defineProperty(). In strict mode, these assignments throw instead of silently failing.

Jak to naprawić

Create a new object with the modified property using spread syntax: { ...obj, prop: newValue }. If you need a mutable object, do not freeze it. Use Object.assign() to create a mutable copy.

'use strict'; const obj = Object.freeze({a:1}); obj.a = 2;