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import { createSelector } from 'reselect'
interface RootState {
todos: { id: number; completed: boolean }[]
alerts: { id: number; read: boolean }[]
}
// Create a selector that double-checks the results of input selectors every time it runs.
const selectCompletedTodosLength = createSelector(
[
// ❌ Incorrect Use Case: This input selector will not be
// memoized properly since it always returns a new reference.
(state: RootState) =>
state.todos.filter(({ completed }) => completed === true)
],
completedTodos => completedTodos.length,
// Will override the global setting.
{ devModeChecks: { inputStabilityCheck: 'always' } }
)
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