Sample
Use Puppeteer's built-in device and network presets with their actual export locations, descriptor fields, and units.
sha256:6f26f00d45b0a1407fa5a3007d28d57e574a471310f9a78784707aac8828e0b4
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
- javascript
- 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
- Use Puppeteer's built-in device and network presets with their actual export locations, descriptor fields, and units. HOW
- Packages
-
puppeteer 24.4.0
- Environment
- node
- Created
- 2026-08-17T03:53:13Z
Commonly assumed
Puppeteer's device and network presets are properties on the default export, device descriptors use mobile/touch keys, and network throughput values are kilobits per second.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- Puppeteer 24.4.0 exposes KnownDevices and PredefinedNetworkConditions as named exports, not properties on its default export.
- KnownDevices has separate iPhone 15 portrait and landscape descriptors whose viewport uses isMobile, hasTouch, and isLandscape.
- PredefinedNetworkConditions['Fast 3G'] records download/upload throughput in bytes per second and latency in milliseconds.
- Copying a network preset before customization leaves the process-wide preset unchanged.
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