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@types/react-dom 18.3.7: Portal rendering into external DOM nodes and event bubbling with React 18 createPortal

検証済みサンプル — npm @types/react-dom 18.3.7: Portal rendering into external DOM nodes and event bubbling with React 18 createPortal. node 22 · linux alpine/x64 …

sha256:7cbbf70331234b453cefa0c06a2e9812827e0f9269deeb8e497511cb6671cd0f

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
2
ビルドした署名鍵
1
宣言された環境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

検証実行環境

環境 コントラクト ステージ 実行日
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-26
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-07

ケース

HOW
ゴール
Portal rendering into external DOM nodes and event bubbling with React 18 createPortal
パッケージ
シンボル
  • createPortal
環境
node 22.23.2
作成日
2026-08-26T14:40:59Z

コントラクト

  1. createPortal is exported as a function from react-dom
  2. createPortal throws descriptive error when container is null or invalid
  3. renderPortal renders React element into specified external DOM container
  4. portal events bubble up through React component tree to ancestor handlers
  5. updating parent component re-renders portal children in target container
  6. unmounting parent component removes portal children from external DOM container

ファイル

  • NOTES.md
  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

ソースアーティファクトをダウンロード (tar.gz)

ソース

NOTES.md
# React DOM portal rendering and React component tree event bubbling

## Prior CSX search

`search_known_solution` was queried for `pkg:npm/%40types/react-dom@18.3.7`, `pkg:npm/react-dom@18.3.1`, and `pkg:npm/react@18.3.1` covering `createPortal`. No verified sample existed, returning `NO_SAFE_MATCH`.

## The tempting wrong model

Callers commonly assume:
1. `createPortal` must be imported from `react-dom/client` alongside `createRoot`.
2. Events dispatched inside a portal only bubble through the physical DOM destination hierarchy and cannot be caught by parent React handlers.
3. `createPortal` silently ignores null or non-element target containers.
4. Portals require a separate `createRoot` instance or manual cleanup in unmount effects.
5. Updating state in the parent host component cannot trigger re-renders or pass new props to portal children.

## Observable failure

1. In React 18, `createPortal` is exported directly from `react-dom`; `react-dom/client` does not export `createPortal`.
2. React synthetic events originating inside a portal bubble up through the React component hierarchy to ancestor component handlers regardless of where the portal DOM node is attached.
3. Passing null or an invalid node to `createPortal` throws `Target container is not a DOM element.`
4. Unmounting the parent React root automatically unmounts and removes the portal DOM subtree from the external container.
5. Updates to parent props or state re-render the portal subtree in place within the target container.
PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: Portal rendering into external DOM nodes and event bubbling with React 18 createPortal
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40types/react-dom@18.3.7
  - pkg:npm/react-dom@18.3.1
  - pkg:npm/react@18.3.1
Demonstrate these symbols/APIs:
  - createPortal
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:53302c3176e5279b7715197e7185ad2353cb10ddd01ba2ea10f8e856887f75c6","constraints":{"executionContext":"node"},"contract":["createPortal is exported as a function from react-dom","createPortal throws descriptive error when container is null or invalid","renderPortal renders React element into specified external DOM container","portal events bubble up through React component tree to ancestor handlers","updating parent component re-renders portal children in target container","unmounting parent component removes portal children from external DOM container"],"goal":"Portal rendering into external DOM nodes and event bubbling with React 18 createPortal","kind":"HOW","packages":["pkg:npm/%40types/react-dom@18.3.7","pkg:npm/react-dom@18.3.1","pkg:npm/react@18.3.1"],"schemaVersion":1,"symbols":["createPortal"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40types/react-dom@18.3.7","pkg:npm/react-dom@18.3.1","pkg:npm/react@18.3.1"],"schemaVersion":1,"symbols":["createPortal"],"verifierAdapter":"node-typescript@1"}
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package.json
{
  "name": "csx-sample-react-dom-create-portal",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "react": "18.3.1",
    "react-dom": "18.3.1"
  },
  "devDependencies": {
    "@types/react": "18.3.18",
    "@types/react-dom": "18.3.7",
    "jsdom": "24.1.3"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "Portal rendering into external DOM nodes and event bubbling with React 18 createPortal",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40types/react-dom@18.3.7",
    "pkg:npm/react-dom@18.3.1",
    "pkg:npm/react@18.3.1"
  ],
  "symbols": [
    "createPortal"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.mjs
import { createPortal, flushSync } from 'react-dom';
import { createRoot } from 'react-dom/client';

/**
 * Creates a React portal that renders children into an external DOM container.
 *
 * @param {import('react').ReactNode} children - React elements or primitives to render
 * @param {Element | DocumentFragment} container - Destination DOM node
 * @param {string | null} [key] - Optional key for React list reconciliation
 * @returns {import('react').ReactPortal} React portal object
 */
export function createPortalNode(children, container, key = null) {
  return createPortal(children, container, key);
}

/**
 * Mounts a React application containing a host subtree and a portal subtree,
 * synchronously flushing the initial render.
 *
 * @param {Element} hostContainer - DOM container for the primary component tree
 * @param {Element} portalContainer - External DOM container for the portal subtree
 * @param {Function} componentFactory - Function receiving ({ portalContainer, ...props }) and returning React element
 * @param {object} [initialProps] - Initial props passed to componentFactory
 * @returns {{ root: import('react-dom/client').Root, update: Function, unmount: Function }} Controller object
 */
export function mountPortalApp(hostContainer, portalContainer, componentFactory, initialProps = {}) {
  const root = createRoot(hostContainer);

  function render(props) {
    flushSync(() => {
      root.render(componentFactory({ portalContainer, ...props }));
    });
  }

  render(initialProps);

  return {
    root,
    update: (nextProps) => render(nextProps),
    unmount: () => {
      flushSync(() => {
        root.unmount();
      });
    },
  };
}
test/contract.mjs
import assert from 'node:assert/strict';
import { JSDOM } from 'jsdom';

const dom = new JSDOM('<!doctype html><html><body></body></html>', {
  url: 'https://example.test/',
});

for (const key of ['window', 'document', 'navigator', 'Node', 'Element', 'HTMLElement', 'HTMLButtonElement', 'MouseEvent']) {
  if (dom.window[key] !== undefined) {
    Object.defineProperty(globalThis, key, {
      configurable: true,
      writable: true,
      value: dom.window[key],
    });
  }
}

try {
  const React = await import('react');
  const { createElement: h } = React.default || React;
  const ReactDOM = await import('react-dom');
  const { createPortal } = ReactDOM.default || ReactDOM;
  const { createPortalNode, mountPortalApp } = await import('../src/index.mjs');

  // Contract 1: createPortal is exported as a function from react-dom
  assert.equal(typeof createPortal, 'function', 'createPortal should be exported as a function from react-dom');
  assert.equal(typeof createPortalNode, 'function', 'createPortalNode helper should be exported as a function');

  // Contract 2: createPortal throws descriptive error when container is null or invalid
  assert.throws(
    () => {
      createPortal(h('div', null, 'content'), null);
    },
    {
      message: /Target container is not a DOM element/i,
    },
    'createPortal should throw descriptive error when given null container',
  );

  // Contract 3: renderPortal renders React element into specified external DOM container
  const hostContainer = document.createElement('div');
  hostContainer.id = 'host-root';
  const portalContainer = document.createElement('div');
  portalContainer.id = 'modal-root';
  document.body.appendChild(hostContainer);
  document.body.appendChild(portalContainer);

  function ModalApp({ portalContainer, title, message }) {
    return h('div', { id: 'host-view' }, [
      h('h1', { key: 'h1', id: 'host-heading' }, 'Host Document'),
      createPortalNode(
        h('div', { key: 'modal', id: 'portal-dialog', 'data-testid': 'portal-modal' }, [
          h('h2', { key: 'h2', id: 'modal-title' }, title),
          h('p', { key: 'p', id: 'modal-message' }, message),
        ]),
        portalContainer,
      ),
    ]);
  }

  const app = mountPortalApp(hostContainer, portalContainer, ModalApp, {
    title: 'Dialog Title',
    message: 'Rendered in external DOM node',
  });

  // Verify host DOM contains host content and NOT the portal children
  assert.ok(hostContainer.querySelector('#host-heading'), 'Host container should contain host heading');
  assert.equal(hostContainer.querySelector('#portal-dialog'), null, 'Portal dialog should not be inside host DOM');

  // Verify portal DOM contains portal children
  const modalEl = portalContainer.querySelector('#portal-dialog');
  assert.ok(modalEl, 'Portal container should contain portal dialog');
  assert.equal(portalContainer.querySelector('#modal-title').textContent, 'Dialog Title');
  assert.equal(portalContainer.querySelector('#modal-message').textContent, 'Rendered in external DOM node');

  // Contract 4: portal events bubble up through React component tree to ancestor handlers
  let ancestorClickReceived = false;
  let portalButtonClickReceived = false;

  function InteractiveApp({ portalContainer, onClickAncestor }) {
    return h(
      'div',
      {
        id: 'ancestor-wrapper',
        onClick: (e) => {
          ancestorClickReceived = true;
          if (onClickAncestor) onClickAncestor(e);
        },
      },
      [
        h('span', { key: 'label' }, 'Parent Wrapper'),
        createPortalNode(
          h(
            'button',
            {
              key: 'btn',
              id: 'portal-action-btn',
              onClick: () => {
                portalButtonClickReceived = true;
              },
            },
            'Action',
          ),
          portalContainer,
          'interactive-portal',
        ),
      ],
    );
  }

  const interactiveHost = document.createElement('div');
  interactiveHost.id = 'interactive-host';
  const interactivePortal = document.createElement('div');
  interactivePortal.id = 'interactive-portal-target';
  document.body.appendChild(interactiveHost);
  document.body.appendChild(interactivePortal);

  const interactiveApp = mountPortalApp(interactiveHost, interactivePortal, InteractiveApp);

  const actionBtn = interactivePortal.querySelector('#portal-action-btn');
  assert.ok(actionBtn, 'Portal action button should be in portal container');

  // Dispatch click on portal button
  actionBtn.dispatchEvent(new dom.window.MouseEvent('click', { bubbles: true }));

  assert.equal(portalButtonClickReceived, true, 'Portal button onClick handler should be called');
  assert.equal(ancestorClickReceived, true, 'Portal event should bubble up to React tree ancestor');

  // Contract 5: updating parent component re-renders portal children in target container
  app.update({
    title: 'Updated Title',
    message: 'Updated message in portal',
  });

  assert.equal(portalContainer.querySelector('#modal-title').textContent, 'Updated Title');
  assert.equal(portalContainer.querySelector('#modal-message').textContent, 'Updated message in portal');

  // Contract 6: unmounting parent component removes portal children from external DOM container
  app.unmount();
  assert.equal(hostContainer.innerHTML, '', 'Host container should be empty after unmount');
  assert.equal(portalContainer.innerHTML, '', 'Portal container should be empty after unmount');

  interactiveApp.unmount();
  assert.equal(interactiveHost.innerHTML, '', 'Interactive host should be empty after unmount');
  assert.equal(interactivePortal.innerHTML, '', 'Interactive portal target should be empty after unmount');

  hostContainer.remove();
  portalContainer.remove();
  interactiveHost.remove();
  interactivePortal.remove();

  console.log('All contracts passed successfully.');
} catch (err) {
  console.error('Contract verification failed:', err);
  process.exit(1);
}

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