createSelectorCreator

createSelectorCreator is a factory function provided by the Reselect library for JavaScript and TypeScript that produces customized selector-creation functions. It lets developers substitute the default memoization strategy used by reselect selectors with an alternative memoizer or custom equality logic. The returned function has the same general API as createSelector: it accepts input selector functions and a result function, and returns a memoized selector that derives computed data from state.

Typical use cases include replacing the default last-call cache with a deep-equality check (for outputs that are structurally equal but not referentially identical), using an LRU or multi-argument cache implementation, or integrating specialized memoizers that better match an application's data patterns (for example, memoizers designed for immutable or large nested structures). To customize behavior, createSelectorCreator is called with a memoize function (one that accepts a function and returns a memoized version) and optional memoizer-specific options.

While customization can improve correctness or cache hit rates in some scenarios, it can also introduce overhead: deep comparisons or more complex caches may be slower than simple identity checks. For that reason createSelectorCreator is considered an advanced feature, appropriate when the default memoization does not meet application requirements. It is exported by Reselect and commonly used with utilities such as lodash/isEqual, memoizee, or other memoization libraries.