@mui/x-charts/esm/internals/plugins/utils/selectors.js

The community edition of MUI X Charts components.

import { lruMemoize, createSelectorCreator } from 'reselect';
const reselectCreateSelector = createSelectorCreator({
  memoize: lruMemoize,
  memoizeOptions: {
    maxSize: 1,
    equalityCheck: Object.is
  }
});
const cache = new WeakMap();
/**
 * Method wrapping reselect's createSelector to provide caching for chart instances.
 *
 */
export const createSelector = (...createSelectorArgs) => {
  const selector = (state, ...selectorArgs) => {
    const cacheKey = state.cacheKey;

    // If there is no cache for the current chart instance, create one.
    let cacheForCurrentChartInstance = cache.get(cacheKey);
    if (!cacheForCurrentChartInstance) {
      cacheForCurrentChartInstance = new Map();
      cache.set(cacheKey, cacheForCurrentChartInstance);
    }

    // If there is a cached selector, execute it.
    const cachedSelector = cacheForCurrentChartInstance.get(createSelectorArgs);
    if (cachedSelector) {
      return cachedSelector(state, ...selectorArgs);
    }

    // Otherwise, create a new selector and cache it and execute it.
    const fn = reselectCreateSelector(...createSelectorArgs);
    cacheForCurrentChartInstance.set(createSelectorArgs, fn);
    return fn(state, ...selectorArgs);
  };
  return selector;
};