ESLint Must use destructuring state assignment

That’s called:

Enforce consistent usage of destructuring assignment of props, state,
and context (react/destructuring-assignment)

More details are available here: destructuring-assignment

In order to make that warning/error disappear, you could do like this:

      ...
      const { items }= this.state;
      ...
      {
        items.map(item => (
          <div key={item}>
            {
            item.links.map(thing => (
              <NavLink
                key={thing.link.id}
                exact
                to={thing.link.url}
              >
                {thing.link.text}
              </NavLink>
            ))
            }
          </div>
        ))
      }