Sample
Control script execution scope and capture uncaught script exceptions using JSDOM runScripts modes and VirtualConsole event routing
sha256:25b9a38825174ba5a14d0ac2113dc8725a5d805f5e75e487a2d3e0f235436362
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- node
- Operating system
- linux
- Architecture
- x64
- Runtime
- node
- Language
- node
- Package manager
- npm
Verification-run environments
- Execution context
- node 22
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17
Case
- Goal
- Control script execution scope and capture uncaught script exceptions using JSDOM runScripts modes and VirtualConsole event routing HOW
- Packages
-
jsdom 26.1.0
- Environment
- node
- Created
- 2026-08-17T17:23:31Z
Commonly assumed
HTML script tags and inline event handlers execute automatically in JSDOM, and any unhandled script exceptions throw synchronous runtime errors from the JSDOM constructor.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- 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.
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9