Sample
bcryptjs 3.0.3: Yield to the event loop during asynchronous password hashing and salting with bcryptjs, preventing microtask starvation across fallback environments
Verified sample for npm bcryptjs 3.0.3: Yield to the event loop during asynchronous password hashing and salting with bcryptjs, preventing microtask…
sha256:9e219aeffefa5e13b5124aa75c30e8a8becf5610b02323cfaddece8768f99420
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 javascript 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
- Yield to the event loop during asynchronous password hashing and salting with bcryptjs, preventing microtask starvation across fallback environments
- Packages
- Symbols
-
- bcrypt.genSalt
- bcrypt.genSaltSync
- bcrypt.hash
- bcrypt.hashSync
- bcrypt.compare
- bcrypt.compareSync
- bcrypt.truncates
- bcrypt.getRounds
- bcrypt.getSalt
- Environment
- node
- Created
- 2026-08-16T06:23:38Z
Contract
- assert bcryptjs package manifest confirms resolved version 3.0.3
- assert async bcrypt operations do not execute in the microtask phase, allowing queued process.nextTick microtasks to drain first
- assert fallback dispatcher in environments without setImmediate uses macrotasks (setTimeout / scheduler.postTask) rather than process.nextTick, preventing event loop starvation during async hashing
- assert async functions return a Promise when callback is omitted, but return undefined when a callback function is passed
- assert synchronous methods (hashSync, compareSync) throw Errors immediately on illegal arguments while asynchronous methods (hash, compare) return rejected Promises
- assert compare returns false rather than throwing when encountering a malformed or short hash string
- assert progressCallback tracks computation progress from 0.0 to 1.0 during async hashing and comparison
- assert genSalt shifts arguments when callback is passed as the second argument, and ignores legacy numeric seed_length preserving 16-byte salt length
- assert getSalt extracts the 29-character salt prefix from a 60-character hash and throws Illegal hash length on a raw 29-character salt string
- assert default generated salt revision is $2b$ in v3 while maintaining backward compatibility with legacy $2a$ vectors, and rejecting invalid revisions ($2x$, $1$)
- assert truncates() measures UTF-8 byte length against the 72-byte limit rather than character count, truncating 25 3-byte unicode characters (75 bytes) while keeping 24 characters (72 bytes)
- assert passwords exceeding 72 UTF-8 bytes produce identical hashes to their 72-byte prefix, creating cross-verification collisions
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- src/hasher.mjs
- test/contract.mjs