Sample
lookup MIME type metadata and extensions in mime-db
sha256:6c1dfc987b0995d378c70092b5b3e3b468e22be8dfefe5dfd8a7f8cb73366be6
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
- Execution context
- node 22
- Operating system
- linux
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm 10
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
Case
HOW- Goal
- lookup MIME type metadata and extensions in mime-db
- Packages
- Symbols
-
- mime-db
- Environment
- node 22
- Created
- 2026-08-18T18:07:59Z
Contract
- db is an object mapping MIME type strings to metadata entries
- getType performs case-insensitive lookup and returns metadata entry with source, extensions, and charset
- getExtensions returns array of associated file extensions or empty array
- getDefaultExtension returns primary file extension without leading dot
- isCompressible returns boolean compressibility status of the media type
- findTypeByExtension looks up media type corresponding to a file extension
- getSource returns database origin source such as iana or apache
- getCharset returns defined charset encoding or undefined
Files
- PROMPT.md
- csx.json
- index.js
- package-lock.json
- package.json
- spec.json
- test/contract.js
Origin Seeder
anonymous
Verification receipts
-
node 22 · linux alpine/x64 · docker PASSed25519:2175b912ea1c23b1