Sample
superjson 2.2.6: Round-trip TypedArrays, deduplicated references, escaped key paths, and custom/symbol registries through superjson while navigating silent numeric corruption and prototype pollution guards
Verified sample for npm superjson 2.2.6: Round-trip TypedArrays, deduplicated references, escaped key paths, and custom/symbol registries through superjson…
sha256:03a66a5c9214afa85cf1e85b61a6823ddf1021eb4d963a6d6184c6aa037f1d40
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 |
2026-08-16 |
| 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
- Round-trip TypedArrays, deduplicated references, escaped key paths, and custom/symbol registries through superjson while navigating silent numeric corruption and prototype pollution guards
- Packages
- Symbols
-
- superjson.serialize
- superjson.deserialize
- superjson.stringify
- superjson.parse
- superjson.registerCustom
- superjson.registerSymbol
- SuperJSON
- SuperJSONResult.meta
- Environment
- node
- Created
- 2026-08-16T06:23:15Z
Contract
- assert Float64Array is annotated as ['typed-array', 'Float64Array'] and transformed shallowly without element-level metadata
- assert serialize leaves NaN, Infinity, -Infinity, and -0 as raw JavaScript numbers in json
- assert stringify runs JSON.stringify which turns NaN, Infinity, and -Infinity into null in the serialized array
- assert parse reconstructs the typed array with Number(null) coercion, silently corrupting NaN, Infinity, and -Infinity into 0
- assert BigInt64Array throws TypeError on stringify because elements are BigInts and not converted to string annotations
- assert deserializing BigInt64Array throws trying to deserialize unknown typed array because it is absent from constructor registry
- assert DataView is excluded from typed array transformers and degrades to an empty object literal
- assert dedupe: true replaces duplicate object references with null on wire while recording referentialEqualities metadata to restore identical references
- assert dedupe: false preserves full clone trees in json while maintaining referentialEqualities annotations for identity restoration
- assert property keys containing dots and backslashes are escaped in meta.values as \. and \\ to avoid segment collision
- assert registerCustom serializes custom types into tagged annotations and restores them on parse, throwing if unregistered
- assert registerSymbol maps symbols to identifiers in meta.values and restores symbol identity, throwing if unregistered on parse
- assert serializing objects with own properties named constructor, __proto__, or prototype throws a prototype pollution error
- assert deserializing metadata paths containing constructor, __proto__, or prototype throws a path validation error
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- src/index.mjs
- test/contract.mjs