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TypeScript 5.5 adds support for new Set methods: union, intersection, difference, and symmetricDifference. These make it easier to combine, compare, and filter sets of unique values in your code.

React stores Hooks as a singly linked list attached to each functional component, ensuring state and effects are managed in a consistent order during every render. This design allows React to efficiently track and update state, but requires that Hooks are always called in the same order and never conditionally. As a result, functional components remain predictable and stable.