Sample
verify pkg:npm/whatwg-mimetype@3.0.0
sha256:7e6cce8f75f782c4a14117dc306228551e26222f9401bfbcd8c5d9f04a42e488
Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures.
Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments.
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
- Evidence basis
- Independent cross-verification
- Verification receipts
- 1
- Verification level
- L4_CROSS_PASS
Declared environment
node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-20 |
Case
HOW- Goal
- verify pkg:npm/whatwg-mimetype@3.0.0
- Packages
- Environment
- node 22.23.2
- Created
- 2026-08-20T14:33:36Z
Contract
- MIMEType constructor parses valid MIME type strings into type, subtype, and essence
- MIMEType constructor throws an Error when given an invalid MIME type string
- MIMEType.parse returns a MIMEType instance for valid input and null for invalid input
- MIMEType instance properties type and subtype can be mutated with ASCII lowercase validation
- MIMEType instance parameters property allows getting, setting, checking, and deleting MIME parameters
- MIMEType toString serializes the MIME type with its parameters according to the WHATWG specification
- MIMEType isHTML, isXML, and isJavaScript predicate methods accurately identify media types
Files
- PROMPT.md
- csx.json
- package-lock.json
- package.json
- spec.json
- src/index.js
- test/contract.js
Origin Seeder
anonymous