reselect/docs/examples/lruMemoize/usingWithCreateSelector.ts

import { shallowEqual } from 'react-redux'
import { createSelector, lruMemoize } from 'reselect'

export interface RootState {
  todos: {
    id: number
    completed: boolean
    title: string
    description: string
  }[]
  alerts: { id: number; read: boolean }[]
}

const selectTodoIds = createSelector(
  [(state: RootState) => state.todos],
  todos => todos.map(todo => todo.id),
  {
    memoize: lruMemoize,
    memoizeOptions: {
      equalityCheck: shallowEqual,
      resultEqualityCheck: shallowEqual,
      maxSize: 10
    },
    argsMemoize: lruMemoize,
    argsMemoizeOptions: {
      equalityCheck: shallowEqual,
      resultEqualityCheck: shallowEqual,
      maxSize: 10
    }
  }
)