Avoid array element extraction by index to avoid typecheck verification

Some parts of the code might have:
```ts
const elem = array[index];
console.log(elem.field);
```

Which is dangerous because `array[index]` assumes `elem` is not null.

doing:

```ts
const elem = array[index] ?? null;
console.log(elem.field);
```

is also wrong because typescript won't assign "null" to `elem`'s type