Sample
happy-dom 20.11.2: VirtualConsolePrinter buffers console logs, destructively drains on read/readAsString calls, filters by log level, formats group indentation and collapsed group suppression, dispatches lifecycle events, and is exposed on Window via happyDOM.virtualConsolePrinter.
Verified sample for npm happy-dom 20.11.2: VirtualConsolePrinter buffers console logs, destructively drains on read/readAsString calls, filters by log level…
sha256:d441e94a7c6bb72eecdd1deff6dfec2ade1724d7325ec0c3ff65739e39d46a7e
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:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-18 |
| 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 |
Case
HOW- Goal
- VirtualConsolePrinter buffers console logs, destructively drains on read/readAsString calls, filters by log level, formats group indentation and collapsed group suppression, dispatches lifecycle events, and is exposed on Window via happyDOM.virtualConsolePrinter.
- Packages
- Symbols
-
- happy-dom.VirtualConsolePrinter
- Environment
- node
- Created
- 2026-08-18T03:38:20Z
Contract
- VirtualConsolePrinter.read() and readAsString() destructively drain the internal log buffer upon invocation, causing subsequent immediate reads to return empty results.
- readAsString(minLogLevel) filters formatted output by severity while draining all log entries from the buffer regardless of level.
- console.group() indents log entries by two spaces with a ▼ prefix, whereas console.groupCollapsed() suppresses nested entries from readAsString() with a ▶ prefix.
- addEventListener dispatches synchronous 'print' and 'clear' events on log and clear operations, rejecting unsupported event names.
- close() marks the printer as closed, flushes buffered entries and listeners, and causes subsequent print and event calls to be ignored.
- Window instances expose the page VirtualConsolePrinter through window.happyDOM.virtualConsolePrinter.
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs