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Showing content from https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Errors/Cant_assign_to_property below:

TypeError: can't assign to property "x" on "y": not an object - JavaScript

Ошибка строгого режима JavaScript "can't assign to property" ("невозможно присвоить свойство") происходит в тот момент, когда вы пытаетесь создать свойство примитивного типа данных (такого как символ, строка, число или булевое значение). Примитивные типы данных не могут содержать никаких свойств.

TypeError: can't assign to property "x" on {y}: not an object> (Firefox)
TypeError: Cannot create property 'x' on {y} (Chrome)

TypeError.

In Strict_mode, a TypeError is raised when attempting to create a property on primitive value such as a symbol, a string, a number or a boolean. Primitive values cannot hold any property.

The problem might be that an unexpected value is flowing at an unexpected place, or that an object variant of a String or a Number is expected.

"use strict";

var foo = "my string";
// The following line does nothing if not in strict mode.
foo.bar = {}; // TypeError: can't assign to property "bar" on "my string": not an object

Either fix the code to prevent the primitive from being used in such places, or fix the issue is to create the object equivalent Object.

"use strict";

var foo = new String("my string");
foo.bar = {};

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