Sample
mime 4.1.0: Define custom MIME types and override mappings using Mime instance in mime v4
Verified sample for npm mime 4.1.0: Define custom MIME types and override mappings using Mime instance in mime v4. The contract ran on node 22 · linux…
sha256:4bee1294ea2016465962d0cec020436b9816db1314ca6c68af54a0a9e6697805
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.
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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 node 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
- Define custom MIME types and override mappings using Mime instance in mime v4
- Packages
- Symbols
-
- Mime
- Mime.define
- Mime.getAllExtensions
- Mime.getType
- Mime.getExtension
- Environment
- node
- Created
- 2026-08-16T07:07:36Z
Contract
- assert default mime object throws on mime.define because it is frozen in v4
- create a custom Mime instance with standardTypes to allow custom definitions
- assert defining a conflicting extension throws unless force=true is supplied
- assert starred extensions define reverse lookup without hijacking getType
- assert getAllExtensions returns a Set rather than an Array and returns null for unknown types
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- src/index.mjs
- test/contract.mjs