feat(diff): detect license changes between SBOMs - #33
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The tool is positioned for supply-chain and compliance auditing, yet diff() ignored the license field entirely — a dependency silently switching from a permissive license (MIT) to a copyleft one (GPL-3.0) produced no signal at all, even though the reader already parses per-component licenses. Add license-change detection: - New LicenseChange type and ChangeReport.licenseChanges / summary.totalLicenseChanges - diff() flags components present in both SBOMs whose declared license differs. Only fires when both sides declare a license, so newly-added or dropped license metadata is not mistaken for a relicense. Independent of version, so an in-place relicense is caught even without a version bump. - Text and Markdown reports render a License Changes section; JSON gains the field automatically - Tests for detection, the version-unchanged case, the metadata-only case, and the no-change case; README documents the new report field Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012JxAhzwjGGfRAJrv1FCC6c
dmchaledev
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Aug 7, 2026
The license-change feature (#33) added totalLicenseChanges to the ChangeReport summary and licenseChanges to the report, but the gateFailures test fixture in cli.test.ts was never updated, so tsc --noEmit fails on main and every dependabot PR. Restore green CI by completing the fixture. Co-authored-by: Hermes Agent <agent@hermes.ai>
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What & why
sbom-diffis positioned for supply-chain and compliance auditing (the README's audience is "supply-chain risk analysts who need to … produce auditable SBOM diff reports for compliance evidence"). Butdiff()ignored thelicensefield entirely: a dependency silently switching from a permissive license (MIT) to a copyleft one (GPL-3.0) produced no signal at all — even though the parser already extracts a per-component license from both CycloneDX and SPDX inputs.For a compliance tool, an in-place relicense is exactly the kind of event a diff should surface, so this adds license-change detection alongside the existing added / removed / upgraded / CVE tracking.
Changes
LicenseChangetype;ChangeReport.licenseChangesandsummary.totalLicenseChanges(exported from the package entry point).Verification
npm run typecheck,npm run lint, andnpm testall pass. Verified end-to-end by building and running the CLI on two CycloneDX fixtures where one component switches MIT → GPL-3.0:The unchanged component in the same fixture produces no entry.
Backwards compatibility
Purely additive to the public API — existing report fields are unchanged. The one caveat is that
ChangeReportnow has a requiredlicenseChangesfield, so any code that hand-builds aChangeReportliteral (rather than getting one fromdiff()) will need to add it; all reports produced by this package include it.🤖 Generated with Claude Code
https://claude.ai/code/session_012JxAhzwjGGfRAJrv1FCC6c
Generated by Claude Code