@wordpress/hooks/build-module/createHasHook.js

WordPress hooks library.

/**
 * Internal dependencies
 */

/**
 *
 * Returns whether any handlers are attached for the given hookName and optional namespace.
 */

/**
 * Returns a function which, when invoked, will return whether any handlers are
 * attached to a particular hook.
 *
 * @param hooks    Hooks instance.
 * @param storeKey
 *
 * @return  Function that returns whether any handlers are
 *                   attached to a particular hook and optional namespace.
 */
function createHasHook(hooks, storeKey) {
  return function hasHook(hookName, namespace) {
    const hooksStore = hooks[storeKey];

    // Use the namespace if provided.
    if ('undefined' !== typeof namespace) {
      return hookName in hooksStore && hooksStore[hookName].handlers.some(hook => hook.namespace === namespace);
    }
    return hookName in hooksStore;
  };
}
export default createHasHook;
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