All files / lib/tasks patch-node.js

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import patch from '../node/patch';
import Transaction from '../transaction';
import { CreateNodeHookCache, VTree } from '../util/types';
import globalThis from '../util/global';
 
/**
 * Processes a set of patches onto a tracked DOM Node.
 *
 * @param {Transaction} transaction
 * @return {void}
 */
export default function patchNode(transaction) {
  const { mount, state, patches } = transaction;
  const { mutationObserver, measure, scriptsToExecute } = state;
 
  measure('patch node');
 
  const { ownerDocument } = /** @type {HTMLElement} */ (mount);
  const promises = transaction.promises || [];
 
  state.ownerDocument = ownerDocument || globalThis.document;
 
  // Always disconnect a MutationObserver before patching.
  if (mutationObserver) {
    mutationObserver.disconnect();
  }
 
  // Hook into the Node creation process to find all script tags, and mark them
  // for execution.
  const collectScripts = (/** @type {VTree} */vTree) => {
    if (vTree.nodeName === 'script') {
      scriptsToExecute.set(vTree, vTree.attributes.type);
    }
  };
 
  CreateNodeHookCache.add(collectScripts);
 
  // Skip patching completely if we aren't in a DOM environment.
  if (state.ownerDocument) {
    promises.push(...patch(patches, state));
  }
 
  CreateNodeHookCache.delete(collectScripts);
 
  transaction.promises = promises;
  measure('patch node');
}