@wordpress/interactivity/build-module/init.js

Package that provides a standard and simple way to handle the frontend interactivity of Gutenberg blocks.

/**
 * External dependencies
 */
import { hydrate } from 'preact';
/**
 * Internal dependencies
 */
import { toVdom, hydratedIslands } from './vdom';
import { createRootFragment, splitTask } from './utils';
import { directivePrefix } from './constants';

// Keep the same root fragment for each interactive region node.
const regionRootFragments = new WeakMap();
export const getRegionRootFragment = region => {
  if (!region.parentElement) {
    throw Error('The passed region should be an element with a parent.');
  }
  if (!regionRootFragments.has(region)) {
    regionRootFragments.set(region, createRootFragment(region.parentElement, region));
  }
  return regionRootFragments.get(region);
};

// Initial vDOM regions associated with its DOM element.
export const initialVdom = new WeakMap();

// Initialize the router with the initial DOM.
export const init = async () => {
  const nodes = document.querySelectorAll(`[data-${directivePrefix}-interactive]`);

  /*
   * This `await` with setTimeout is required to apparently ensure that the interactive blocks have their stores
   * fully initialized prior to hydrating the blocks. If this is not present, then an error occurs, for example:
   * > view.js:46 Uncaught (in promise) ReferenceError: Cannot access 'state' before initialization
   * This occurs when splitTask() is implemented with scheduler.yield() as opposed to setTimeout(), as with the former
   * split tasks are added to the front of the task queue whereas with the latter they are added to the end of the queue.
   */
  await new Promise(resolve => {
    setTimeout(resolve, 0);
  });
  for (const node of nodes) {
    if (!hydratedIslands.has(node)) {
      await splitTask();
      const fragment = getRegionRootFragment(node);
      const vdom = toVdom(node);
      initialVdom.set(node, vdom);
      await splitTask();
      hydrate(vdom, fragment);
    }
  }
};
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