Sample
Configure Option.preset alongside Option.default to prevent bare optional option flags from resolving to boolean true and bypassing custom argParser
sha256:9ed29f29e55e4074676913ca3bb9009038881ff559b26efc27a6df45e0d7e648
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- Goal
- Configure Option.preset alongside Option.default to prevent bare optional option flags from resolving to boolean true and bypassing custom argParser HOW
- Packages
- commander 15.0.0
- Environment
- node
- Created
- 2026-08-16T16:15:21Z
Commonly assumed
Calling Option.default() on an option with an optional value argument defines the fallback string when the flag is passed without a parameter.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- Passing an option with optional argument without a value sets its parsed option value to boolean true and skips argParser unless Option.preset() is configured.
- assert omitted option with optional argument evaluates to Option.default() with source 'default'
- assert Option.preset() supplies the fallback value and invokes argParser when an optional argument flag is passed bare
- assert explicit CLI argument overrides Option.preset() with source 'cli'
- assert getOptionValueSource() distinguishes between 'cli', 'env', and 'default' sources
- assert Option.conflicts() rejects mutually exclusive flags with CommanderError code commander.conflictingOption
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- src/index.mjs
- test/contract.mjs
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-16 · ed25519:d91480838ac982c9