Sample
lookup mime type and extension using mime-types
sha256:b9b33577bfaae52cf9ea720442bf66b3ba3461d167f8f6c8179279246bb5f206
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 and extension using mime-types
- Packages
- Symbols
-
- mime.contentType
- mime.extension
- mime.lookup
- Environment
- node 22
- Created
- 2026-08-18T18:12:11Z
Contract
- mime.lookup returns the MIME type for file paths or extensions and returns false for unknown extensions
- mime.contentType returns the full Content-Type header with default charset for valid types or extensions and returns false when unknown extension is given
- mime.extension returns the default file extension for a MIME type and returns false for unknown types
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