Exemplo
jsdom 26.1.0: Control script execution scope and capture uncaught script exceptions using JSDOM runScripts modes and VirtualConsole event routing
Amostra verificada para npm jsdom 26.1.0: Control script execution scope and capture uncaught script exceptions using JSDOM runScripts modes and…
sha256:25b9a38825174ba5a14d0ac2113dc8725a5d805f5e75e487a2d3e0f235436362
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MIT-0
Evidência de execução
O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.
- Base da evidência
- Contrato assinado aprovado
- Recibos de verificação
- 2
- Chaves de assinatura que o compilaram
- 2
Ambiente declarado
node linux x64 node node npm
Ambientes das execuções de verificação
| Ambiente | Contrato | Etapas | Execução |
|---|---|---|---|
| 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 |
Caso
HOW- Objetivo
- Control script execution scope and capture uncaught script exceptions using JSDOM runScripts modes and VirtualConsole event routing
- Pacotes
- Símbolos
-
- JSDOM
- VirtualConsole
- Ambiente
- node
- Criado
- 2026-08-17T17:23:31Z
Contrato
- 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.
- 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.
- Configuring runScripts to dangerously executes inline script tags and event handler attributes within the JSDOM window context.
- 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.
- VirtualConsole sendTo forwards console logging methods while supporting omitJSDOMErrors to filter out uncaught script exceptions.
Arquivos
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
Código-fonte
# 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.
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}
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"version": "5.1.1",
"resolved": "https://registry.npmjs.org/tr46/-/tr46-5.1.1.tgz",
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"license": "MIT",
"dependencies": {
"punycode": "^2.3.1"
},
"engines": {
"node": ">=18"
}
},
"node_modules/w3c-xmlserializer": {
"version": "5.0.0",
"resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
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"license": "MIT",
"dependencies": {
"xml-name-validator": "^5.0.0"
},
"engines": {
"node": ">=18"
}
},
"node_modules/webidl-conversions": {
"version": "7.0.0",
"resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
"integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==",
"license": "BSD-2-Clause",
"engines": {
"node": ">=12"
}
},
"node_modules/whatwg-encoding": {
"version": "3.1.1",
"resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
"integrity": "sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==",
"deprecated": "Use @exodus/bytes instead for a more spec-conformant and faster implementation",
"license": "MIT",
"dependencies": {
"iconv-lite": "0.6.3"
},
"engines": {
"node": ">=18"
}
},
"node_modules/whatwg-mimetype": {
"version": "4.0.0",
"resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
"integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
"license": "MIT",
"engines": {
"node": ">=18"
}
},
"node_modules/whatwg-url": {
"version": "14.2.0",
"resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-14.2.0.tgz",
"integrity": "sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==",
"license": "MIT",
"dependencies": {
"tr46": "^5.1.0",
"webidl-conversions": "^7.0.0"
},
"engines": {
"node": ">=18"
}
},
"node_modules/ws": {
"version": "8.21.3",
"resolved": "https://registry.npmjs.org/ws/-/ws-8.21.3.tgz",
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"license": "MIT",
"engines": {
"node": ">=10.0.0"
},
"peerDependencies": {
"bufferutil": "^4.0.1",
"utf-8-validate": ">=5.0.2"
},
"peerDependenciesMeta": {
"bufferutil": {
"optional": true
},
"utf-8-validate": {
"optional": true
}
}
},
"node_modules/xml-name-validator": {
"version": "5.0.0",
"resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
"integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
"license": "Apache-2.0",
"engines": {
"node": ">=18"
}
},
"node_modules/xmlchars": {
"version": "2.2.0",
"resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
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"license": "MIT"
}
}
}
{
"name": "npm-jsdom-api",
"version": "1.0.0",
"private": true,
"type": "module",
"dependencies": {
"jsdom": "26.1.0"
}
}
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'] });
}