Immutable arrays after upgrading angular to 11

Question

I just upgraded Angular from 6 to 11 and also typescript to 4.1.5. I have problems with changing properties of any object from an array. It results with an error

core.js:6150 ERROR TypeError: Cannot assign to read only property 'active' of object '[object Object]'

The object I'm trying to change is:

  export interface Agreement {
    active: boolean;
    ...
}

Also when I try to add something to any list, I get this error:

ERROR TypeError: Cannot add property 4, object is not extensible
at Array.push (<anonymous>)

Am I missing any global config property?

Mariusz W · Accepted Answer · 2021-04-15 08:23:27Z

0

I simply created a copy of given field like this:

field = JSON.parse(JSON.stringify(field))

answered Apr 15, 2021 at 8:23

Mariusz W

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