'Randomizing elements in an array in Typescript giving error: TypeError: 0 is read-only

I have an array of objects, and I'd like to randomize the order of the elements.

So I have the following:

const animals  = data?.fetchAllAnimals;
let randomizeAnimals = animals.sort(()=> Math.random() -0.5 )

But I keep getting this error in firefox: TypeError: 0 is read-only

and a different error in chrome: TypeError: Cannot assign to read only property '0' of object '[object Array]'

What am I doing wrong here?

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