Sample
mime 4.1.0: Configure custom MIME types and override standard extensions using a new Mime instance in mime v4
Verified sample for npm mime 4.1.0: Configure custom MIME types and override standard extensions using a new Mime instance in mime v4. The contract ran on…
sha256:3908bc115734c965fb5fc4c8f7ca543de93a0bec1e136edbe4667ba452529d89
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.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
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
- Configure custom MIME types and override standard extensions using a new Mime instance in mime v4
- Packages
- Symbols
-
- Mime
- Mime.define
- Mime.getType
- Mime.getExtension
- Environment
- node
- Created
- 2026-08-16T07:26:13Z
Contract
- assert calling define on default mime instance throws because built-in instances are frozen
- assert unpopulated Mime instance only resolves custom types and returns null for standard types
- assert passing conflicting extensions directly to Mime constructor throws without force=true
- assert custom Mime instance with imported standard/other types and forced overrides resolves both custom and overridden types
- assert reverse getExtension mapping works for custom and overridden types
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- src/index.mjs
- test/contract.mjs