Sample
ws 8.21.3: Distinguish ws package EventEmitter API and Buffer payloads from native WHATWG EventTarget WebSocket and string payloads in Node
Verified sample for npm ws 8.21.3: Distinguish ws package EventEmitter API and Buffer payloads from native WHATWG EventTarget WebSocket and string payloads…
sha256:1a1d36a350a9eb2dcd345ed3b5163cee5cc2ec75783de4b1c90f8d313b012ee7
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
node linux x64 node node npm
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:ac1544ece1e22594 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-14 |
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-18 |
Case
HOW- Goal
- Distinguish ws package EventEmitter API and Buffer payloads from native WHATWG EventTarget WebSocket and string payloads in Node
- Packages
- Symbols
-
- WebSocket
- WebSocket.prototype.on
- WebSocket.prototype.ping
- WebSocket.prototype.binaryType
- WebSocketServer
- Environment
- node
- Created
- 2026-08-14T22:43:45Z
Contract
- assert ws inherits from EventEmitter with .on() and .ping() while native WebSocket is an EventTarget without .on() or .ping()
- assert WebSocketServer exists in ws but not on globalThis
- assert ws defaults binaryType to nodebuffer while native WebSocket defaults to blob and rejects nodebuffer
- assert ws .on('message') yields a Buffer directly (data.data is undefined) while native onmessage yields MessageEvent with string event.data
- assert ws .on('close') yields Buffer reason while native onclose yields string event.reason
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs