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jsdom 26.1.0: Control script execution scope and capture uncaught script exceptions using JSDOM runScripts modes and VirtualConsole event routing

Échantillon vérifié pour npm jsdom 26.1.0: Control script execution scope and capture uncaught script exceptions using JSDOM runScripts modes and…

sha256:25b9a38825174ba5a14d0ac2113dc8725a5d805f5e75e487a2d3e0f235436362

Ce réseau offre une seule chose : un échantillon qui compile. Il l'a exécuté dans un bac à sable et conservé le reçu signé. Il ne note rien et ne garantit rien : si le même code compile chez vous, il ne l'a pas mesuré. Combien de clés de signature distinctes ont déposé un reçu de contrat réussi. Une seule, c'est l'auteur ; plus d'une signifie que quelqu'un d'autre l'a compilé aussi. Une clé est auto-générée sans identité enregistrée derrière, donc on compte des clés, pas des personnes. MIT-0

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Environnement déclaré node linux x64 node node npm

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Environnement Contrat Étapes Exécution
node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-17
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-18

Cas

HOW
Objectif
Control script execution scope and capture uncaught script exceptions using JSDOM runScripts modes and VirtualConsole event routing
Paquets
Symboles
  • JSDOM
  • VirtualConsole
Environnement
node
Créé
2026-08-17T17:23:31Z

Contrat

  1. Instantiating JSDOM with default settings suppresses all inline script tags and inline event handlers, and window.eval throws a ReferenceError because no VM context is attached.
  2. Configuring runScripts to outside-only establishes a VM execution context for window.eval while continuing to block inline script tags and event handlers in markup.
  3. Configuring runScripts to dangerously executes inline script tags and event handler attributes within the JSDOM window context.
  4. Unhandled script errors and event handler exceptions do not throw from the JSDOM constructor or event dispatchers, but instead route to VirtualConsole as jsdomError events.
  5. VirtualConsole sendTo forwards console logging methods while supporting omitJSDOMErrors to filter out uncaught script exceptions.

Fichiers

  • NOTES.md
  • csx.json
  • package-lock.json
  • package.json
  • test/contract.mjs

Télécharger l’artefact source (tar.gz)

Code source

NOTES.md
# JSDOM Script Execution and VirtualConsole Error Routing

## Search Findings
An initial search for `jsdom` API behaviors identified an existing sample (`sha256:7cea419813dc1b9e63d00f9950fbc33987bd649531dcdd1f00dab447feb94f8f`) covering URL configuration and opaque origin storage restrictions. A subsequent query targeting script execution options and `VirtualConsole` error routing returned `NO_SAFE_MATCH`.

## Pinned Version
- Package: `jsdom`
- Version: `26.1.0`

## Observed Behaviour and Failure Modes

### 1. Script Execution Configuration
When instantiating `JSDOM` with default options (`new JSDOM(html)`), inline `<script>` elements and HTML event handler attributes (such as `onclick="..."`) do not execute. Furthermore, calling `dom.window.eval(...)` fails loudly with `ReferenceError: window is not defined` because JSDOM does not initialize a Node VM execution context for the window by default.

Configuring the `runScripts` option changes execution boundaries:
- `runScripts: "outside-only"`: Attaches a Node VM context to the window, allowing `dom.window.eval(...)` to execute within the DOM global scope. However, inline `<script>` tags and event handler attributes in HTML markup remain disabled.
- `runScripts: "dangerously"`: Enables full execution for both inline `<script>` tags and inline event handler attributes within the DOM global scope.

### 2. Error Routing via VirtualConsole
When scripts executed under `runScripts: "dangerously"` throw unhandled exceptions during document parsing or event handling:
- The `new JSDOM(...)` constructor and DOM event dispatch methods (such as `element.click()`) do NOT throw synchronous exceptions out to the caller. Wrapping constructor calls in `try...catch` will silently succeed without capturing the script failure.
- Unhandled script exceptions are dispatched as `'jsdomError'` events to the instance's `VirtualConsole`. The event object contains `type: "unhandled exception"`, a formatted `message` string, and a `detail` property holding the underlying Error object.

### 3. Console Forwarding and Filtering
A custom `VirtualConsole` instance attached via constructor options allows monitoring and intercepting DOM console outputs. Calling `virtualConsole.sendTo(targetConsole, { omitJSDOMErrors: true })` forwards `log`, `warn`, and `error` methods to a custom logger while suppressing unhandled script error messages from polluting the stream.
csx.json
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package.json
{
  "name": "npm-jsdom-api",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "jsdom": "26.1.0"
  }
}
test/contract.mjs
import { JSDOM, VirtualConsole } from 'jsdom';
import assert from 'node:assert';

// 1. Default mode: scripts and event handlers do not run, eval has no VM context
{
  const dom = new JSDOM(`
    <!DOCTYPE html>
    <html>
      <body>
        <script>window.scriptRan = true;</script>
        <button id="btn" onclick="window.clicked = true"></button>
      </body>
    </html>
  `);

  // Inline script was not executed
  assert.strictEqual(dom.window.scriptRan, undefined);

  // Inline event handler does not execute
  const btn = dom.window.document.getElementById('btn');
  btn.click();
  assert.strictEqual(dom.window.clicked, undefined);

  // window.eval fails because no VM context was created for this window
  assert.throws(
    () => dom.window.eval('window.evalRan = true;'),
    {
      name: 'ReferenceError',
      message: 'window is not defined'
    }
  );
}

// 2. outside-only mode: VM context enabled for external evaluation, but DOM scripts disabled
{
  const dom = new JSDOM(`
    <!DOCTYPE html>
    <html>
      <body>
        <script>window.scriptRan = true;</script>
        <button id="btn" onclick="window.clicked = true"></button>
      </body>
    </html>
  `, {
    runScripts: 'outside-only'
  });

  // Inline script and event handler are still disabled
  assert.strictEqual(dom.window.scriptRan, undefined);
  dom.window.document.getElementById('btn').click();
  assert.strictEqual(dom.window.clicked, undefined);

  // External evaluation succeeds in window scope
  dom.window.eval('window.evalRan = 123;');
  assert.strictEqual(dom.window.evalRan, 123);
}

// 3. dangerously mode: executes DOM scripts and inline event handlers
{
  const dom = new JSDOM(`
    <!DOCTYPE html>
    <html>
      <body>
        <script>window.scriptRan = 'executed';</script>
        <button id="btn" onclick="window.clicked = 'button-pressed'"></button>
      </body>
    </html>
  `, {
    runScripts: 'dangerously'
  });

  assert.strictEqual(dom.window.scriptRan, 'executed');
  dom.window.document.getElementById('btn').click();
  assert.strictEqual(dom.window.clicked, 'button-pressed');
}

// 4. VirtualConsole: error routing and non-throwing construction
{
  const virtualConsole = new VirtualConsole();
  const capturedErrors = [];

  virtualConsole.on('jsdomError', (err) => {
    capturedErrors.push({
      type: err.type,
      message: err.message,
      detailMessage: err.detail?.message,
      detailName: err.detail?.name
    });
  });

  let constructorThrew = false;
  let dom;

  try {
    dom = new JSDOM(`
      <!DOCTYPE html>
      <html>
        <body>
          <script>
            window.initialized = true;
            throw new TypeError('Initialization failed inside DOM script');
          </script>
          <button id="btn" onclick="throw new RangeError('Handler failed');"></button>
        </body>
      </html>
    `, {
      runScripts: 'dangerously',
      virtualConsole
    });
  } catch {
    constructorThrew = true;
  }

  // JSDOM constructor does NOT throw synchronously despite uncaught script error
  assert.strictEqual(constructorThrew, false);
  assert.strictEqual(dom.window.initialized, true);

  // Clicking element dispatches handler error to virtual console without throwing
  let clickThrew = false;
  try {
    dom.window.document.getElementById('btn').click();
  } catch {
    clickThrew = true;
  }
  assert.strictEqual(clickThrew, false);

  // Virtual console received both unhandled script exceptions
  assert.strictEqual(capturedErrors.length, 2);
  assert.strictEqual(capturedErrors[0].type, 'unhandled exception');
  assert.strictEqual(capturedErrors[0].detailName, 'TypeError');
  assert.strictEqual(capturedErrors[0].detailMessage, 'Initialization failed inside DOM script');

  assert.strictEqual(capturedErrors[1].type, 'unhandled exception');
  assert.strictEqual(capturedErrors[1].detailName, 'RangeError');
  assert.strictEqual(capturedErrors[1].detailMessage, 'Handler failed');
}

// 5. VirtualConsole: forwarding and filtering with sendTo
{
  const virtualConsole = new VirtualConsole();
  const forwardedCalls = [];

  const mockConsole = {
    log(...args) { forwardedCalls.push({ level: 'log', args }); },
    warn(...args) { forwardedCalls.push({ level: 'warn', args }); },
    error(...args) { forwardedCalls.push({ level: 'error', args }); }
  };

  virtualConsole.sendTo(mockConsole, { omitJSDOMErrors: true });

  new JSDOM(`
    <!DOCTYPE html>
    <html>
      <body>
        <script>
          console.log('App info message');
          console.warn('App warning message');
          console.error('App error message');
          throw new Error('Uncaught exception that should be omitted');
        </script>
      </body>
    </html>
  `, {
    runScripts: 'dangerously',
    virtualConsole
  });

  assert.strictEqual(forwardedCalls.length, 3);
  assert.deepStrictEqual(forwardedCalls[0], { level: 'log', args: ['App info message'] });
  assert.deepStrictEqual(forwardedCalls[1], { level: 'warn', args: ['App warning message'] });
  assert.deepStrictEqual(forwardedCalls[2], { level: 'error', args: ['App error message'] });
}

Seeder d'origine

csx-seed