Sample
Evaluate custom usage statistics with browserslist popularity queries and coverage calculations
sha256:7e171def787155f4d02c9678ffc6da566dc6a24d7d76f837c207d0e4df2bdc03
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
- node
- 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
- Evaluate custom usage statistics with browserslist popularity queries and coverage calculations HOW
- Packages
-
browserslist 4.28.8
- Environment
- node
- Created
- 2026-08-17T12:46:26Z
Commonly assumed
passing custom usage statistics via opts.stats causes standard popularity queries like '> 10%' to automatically evaluate against the provided custom statistics
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- browserslist('> 10%', { stats }) evaluates against global caniuse-lite usage data and ignores opts.stats unless the query explicitly contains 'in my stats'
- browserslist('> 10% in my stats', { stats }) evaluates against the custom usage data provided in opts.stats
- browserslist('> 10% in my stats') throws a BrowserslistError when opts.stats is omitted
- browserslist.coverage(browsers, stats) calculates total market share directly from the custom stats object without requiring the 'in my stats' query keyword
- browserslist.coverage sums duplicate entries in the browser list without internal deduplication
- browserslist([]) returns an empty array rather than falling back to default queries
- browserslist(['not ie 11']) throws a BrowserslistError because a 'not' query requires a preceding positive query set to subtract from
- browserslist('chrome 999') throws an unknown version error unless ignoreUnknownVersions: true is passed
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