@wordpress/data/build-module/resolvers-cache-middleware.js

Data module for WordPress.

/** @typedef {import('./registry').WPDataRegistry} WPDataRegistry */

/**
 * Creates a middleware handling resolvers cache invalidation.
 *
 * @param {WPDataRegistry} registry  Registry for which to create the middleware.
 * @param {string}         storeName Name of the store for which to create the middleware.
 *
 * @return {Function} Middleware function.
 */
const createResolversCacheMiddleware = (registry, storeName) => () => next => action => {
  const resolvers = registry.select(storeName).getCachedResolvers();
  const resolverEntries = Object.entries(resolvers);
  resolverEntries.forEach(([selectorName, resolversByArgs]) => {
    const resolver = registry.stores[storeName]?.resolvers?.[selectorName];
    if (!resolver || !resolver.shouldInvalidate) {
      return;
    }
    resolversByArgs.forEach((value, args) => {
      // Works around a bug in `EquivalentKeyMap` where `map.delete` merely sets an entry value
      // to `undefined` and `map.forEach` then iterates also over these orphaned entries.
      if (value === undefined) {
        return;
      }

      // resolversByArgs is the map Map([ args ] => boolean) storing the cache resolution status for a given selector.
      // If the value is "finished" or "error" it means this resolver has finished its resolution which means we need
      // to invalidate it, if it's true it means it's inflight and the invalidation is not necessary.
      if (value.status !== 'finished' && value.status !== 'error') {
        return;
      }
      if (!resolver.shouldInvalidate(action, ...args)) {
        return;
      }

      // Trigger cache invalidation
      registry.dispatch(storeName).invalidateResolution(selectorName, args);
    });
  });
  return next(action);
};
export default createResolversCacheMiddleware;
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