Public record
Software health reportschema 0.31.0 · metrics 2.10.0 · 2026-08-12 21:16 UTC

gvergnaud / ts-pattern

🎨 The exhaustive Pattern Matching library for TypeScript, with smart type inference.

TypeScriptMIT★ 15,122 stars⑂ 171 forkssince May 2020View on GitHub ↗

gvergnaud/ts-pattern holds a health index of 67 out of 100, placing it in the Good band. It scores highest on Community & Adoption (77/100) and lowest on Engineering Quality (48/100). It was last updated 1 day ago. A single contributor accounts for most of its recent work.

67
overall / 100
Good

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

67
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 61 is calibrated to 67 on the published index scale (record calibration 2026-08-02).

Ownership

Gabriel VergnaudPersonal account
1,194 followers55 public repossince Oct 2014

This repository is owned by a personal account. A single-owner project carries more continuity risk than an organization-backed one.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
npmts-pattern5.9.025,287,207159290 days agopatternmatchingpattern-matchingtypescriptmatch-withmatchswitchadt

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

67Good · 21% of overall
How it's scored
36/36Push recencylast push 1 days ago
11.1/36Commit cadence16/52 weeks with commits
13.6/18Commit volume32 commits in the last year
4/10OpenSSF Scorecard: Maintained5 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 4
Inputs used
commits_last_year32
human_commit_share0.89
days_since_last_push1
active_weeks_last_year16
How it's scored
27/27Ships releases62 releases published
16.2/36Release recencylatest release 290 days ago
19.8/27Release cadencea release every ~49 days
0/10OpenSSF Scorecard: Signed-Releasesno data
Inputs used
releases_count62
latest_release_tagv5.9.0
releases_from_tagsno
days_since_latest_release290
mean_days_between_releases49
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

77Good · 17% of overall
How it's scored
60/60Stars15,122 stars
18.6/25Forks171 forks
8/15Watchers29 watchers
Inputs used
forks171
stars15,122
watchers29
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history
How it's scored
22.5/22.5README
22.5/22.5Licenserecognized license (MIT)
0/18CONTRIBUTING guide
0/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges3
has_contributingno
has_issue_templateno
has_code_of_conductno
readme_badge_servicesshields.io
has_pull_request_templateno
How it's scored
80/80Monthly downloads25,287,207 downloads/month across npm
0/20Registry dependentsnot reported by this ecosystem
Inputs used
packagests-pattern
dependents
ecosystemsnpm
total_downloads
monthly_downloads25,287,207
unverified_packages_excluded
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

63Moderate · 23% of overall
How it's scored
9/54Bus factor1 contributor(s) cover half of all commits
1.1/22.5Commit distributiontop contributor authored 95% of commits
13.5/13.5Contributor breadth25 contributors
10/10OpenSSF Scorecard: Contributorsproject has 6 contributing companies or organizations
Inputs used
bus_factor1
contributors_sampled25
top_contributor_share0.951
How it's scored
30.4/42Issue resolution72% of issues closed
23.1/30PR acceptance91/118 decided PRs merged
0/13Newcomer PR acceptanceno first-time contributor's PR decided in 30d
6/15OpenSSF Scorecard: Code-ReviewFound 2/5 approved changesets -- score normalized to 4
Inputs used
merged_prs91
open_issues53
closed_issues138
prs_merged_7d0
prs_decided_7d0
prs_merged_30d0
prs_decided_30d0
issue_closed_ratio0.723
closed_unmerged_prs27
first_time_authors_30d0
first_time_prs_merged_30d0
first_time_prs_decided_30d0
Excluded from scoring (no data or not applicable): Newcomer PR acceptance. Remaining weights renormalized.
How it's scored
10/30Ownership backingpersonal (user) account
0/20Verified domainnot applicable to user accounts
22.1/25Owner reach1,194 followers of gvergnaud
24.7/25Track record55 public repos, account ~11 yr old
Inputs used
followers1,194
owner_typeUser
is_verified
owner_logingvergnaud
public_repos55
account_age_days4,318
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.
How it's scored
25/25Published & resolvable1 package(s) on npm
26/35Publish recencylatest publish 290 days ago
20/20Version history159 published versions
20/20Not deprecatedactive, not deprecated or yanked
Inputs used
packagests-pattern
ecosystemsnpm
any_deprecatedno
min_days_since_publish290

Engineering Quality

Are baseline engineering and documentation practices in place?

48Weak · 19% of overall
How it's scored
0/24CI workflows
24/24Tests present
0/16Linter config
0/9.6Pre-commit hooks
0/6.4.editorconfig
0/20OpenSSF Scorecard: CI-Tests0 out of 12 merged PRs checked by a CI test -- score normalized to 0
Inputs used
has_cino
has_testsyes
has_editorconfigno
has_linter_configno
has_precommit_configno

Documentation

85Excellent
How it's scored
30/30README
25/25Documentation directory
0/15Documentation / homepage site
10/10Repository description
10/10Topics11 topics
10/10Wiki
Inputs used
topicspattern-matching, typescript, ts, pattern, matching, inference, type-inference, exhaustive, conditions, branching, javascript
has_wikiyes
homepage
docs_site
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

50Moderate · 16% of overall
How it's scored
7.5/7.5Binary-Artifactsno binaries found in the repo
0/7.5Branch-Protectionbranch protection not enabled on development/release branches
0/2.5CI-Tests0 out of 12 merged PRs checked by a CI test -- score normalized to 0
0/2.5CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
3/7.5Code-ReviewFound 2/5 approved changesets -- score normalized to 4
2.5/2.5Contributorsproject has 6 contributing companies or organizations
0/10Dangerous-Workflowno data
7.5/7.5Dependency-Update-Toolupdate tool detected
0/5Fuzzingproject is not fuzzed
2.5/2.5Licenselicense file detected
3/7.5Maintained5 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 4
0/5Packagingno data
0/5Pinned-Dependenciesno data
0/5SASTSAST tool is not run on all commits -- score normalized to 0
0/5Security-Policysecurity policy file not detected
0/7.5Signed-Releasesno data
0/7.5Token-Permissionsno data
0/7.5Vulnerabilities19 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated13
scorecard_versionv5.5.0
checks_inconclusive5
scorecard_aggregate3.7
Excluded from scoring (no data or not applicable): Dangerous-Workflow, Packaging, Pinned-Dependencies, Signed-Releases, Token-Permissions. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisoriesno direct dependency carries a known advisory
0/25Indirect dependencies free of known advisoriestransitive set not separable from development and test dependencies in this scope
0/40No advisories left outstandingno advisory carries a publication date
Inputs used
sourceosv
advisories24
affected_packages12
assessed_packages677
unassessed_packages9
affected_by_severityhigh 10, moderate 1, low 1
direct_affected_packages0
Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories, No advisories left outstanding. Remaining weights renormalized. Matched 677 resolved dependencies against OSV. 9 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list. This repository publishes no package the index resolves, so the repository dependency graph was assessed instead. That graph mixes development and test pins with shipped dependencies, so only the declared runtime dependencies are scored; transitive findings are reported as context and excluded from the score. Reachability is not analyzed.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

64Moderate · 4% of overall
How it's scored
0/45Agent instructionsno CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
38.4/40Legible commit history64 of 89 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url
legible_history_share0.719
agent_instruction_files
agent_instruction_max_bytes
How it's scored
0/18One-command bootstrap
22/22Automated tests
0/11Lint / format config
11/11Static type checkingexamples/gif-fetcher/tsconfig.json, examples/one-file-demo/tsconfig.json, tests/tsconfig.json, tsconfig.json
10/10Reproducible environmentlockfile
0/10Demonstrated agent practiceno agent-authored commits among the last 100
8/8Automated maintenance11 of the last 100 commits are automated dependency updates
0/10OpenSSF Scorecard: Pinned-Dependenciesno data
Inputs used
has_nixno
has_testsyes
lockfilespackage-lock.json
has_dockerfileno
typed_languageyes
bootstrap_files
has_devcontainerno
has_linter_configno
typecheck_configsexamples/gif-fetcher/tsconfig.json, examples/one-file-demo/tsconfig.json, tests/tsconfig.json, tsconfig.json
agent_commit_share0
toolchain_manifests
dependency_bot_commit_share0.11
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Pinned-Dependencies. Remaining weights renormalized.
How it's scored
45/45Type-checkable codeTypeScript (statically typed)
55/55Manageable file sizes0/77 source files over 60KB
Inputs used
primary_languageTypeScript
largest_source_bytes40,115
source_files_sampled77
oversized_source_files0
How it's scored
0/40API schema (OpenAPI/GraphQL/proto)not applicable to this kind of software
0/20MCP servernot applicable to this kind of software
40/40Runnable examplesexamples
Inputs used
example_dirsexamples
has_mcp_signalno
api_schema_files
interfaces_expected_of
Excluded from scoring (no data or not applicable): API schema (OpenAPI/GraphQL/proto), MCP server. Remaining weights renormalized.

Key facts

15,122GitHub stars
25contributors
32commits, last 12 months
1days since last push
62releases
1bus factor
53open issues
npmpackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token

More detail

Star and fork history 0 ★ / 171 ⇿
0Stars
171Forks
62Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

0408012016020017052020-062023-072026-07
Major 2Minor 13Patch 44

Each point covers 6 days.

OpenSSF Scorecard 3.7 / 10
3.7aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-08-12 21:15 UTC

10Binary-Artifactsno binaries found in the repo
0Branch-Protectionbranch protection not enabled on development/release branches
0CI-Tests0 out of 12 merged PRs checked by a CI test -- score normalized to 0
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
4Code-ReviewFound 2/5 approved changesets -- score normalized to 4
10Contributorsproject has 6 contributing companies or organizations
n/aDangerous-Workflowno workflows found
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
4Maintained5 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 4
n/aPackagingpackaging workflow not detected
n/aPinned-Dependenciesno dependencies found
0SASTSAST tool is not run on all commits -- score normalized to 0
0Security-Policysecurity policy file not detected
n/aSigned-Releasesno releases found
n/aToken-PermissionsNo tokens found
0Vulnerabilities19 existing vulnerabilities detected
All dependencies 686

Full resolved dependency set from the GitHub dependency graph: 0 direct and 686 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
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npm@unrs/resolver-binding-wasm32-wasi1.11.1indirect
npm@unrs/resolver-binding-win32-arm64-msvc1.11.1indirect
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npmjs-tokens4.0.0indirect
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npmminimatch3.1.5indirect
npmminimatch5.1.9indirect
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npmminimist1.2.8indirect
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npmmri1.2.0indirect
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npmnanoid3.3.11indirect
npmnapi-postinstall0.3.3indirect
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npmneo-async2.6.2indirect
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npmnormalize-path3.0.0indirect
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npmnpm-run-path4.0.1indirect
npmnth-check2.1.1indirect
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npmobject-assign4.1.1indirect
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npmobject-keys1.1.1indirect
npmobject.assign4.1.4indirect
npmonce1.4.0indirect
npmonetime5.1.2indirect
npmopen8.4.2indirect
npmp-finally1.0.0indirect
npmp-limit2.3.0indirect
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npmp-locate4.1.0indirect
npmp-queue6.6.2indirect
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npmpackage-json-from-dist1.0.1indirect
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npmparse-json5.2.0indirect
npmpath-exists4.0.0indirect
npmpath-is-absolute1.0.1indirect
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npmpath-scurry1.11.1indirect
npmpath-type4.0.0indirect
npmpicocolors1.1.1indirect
npmpicomatch2.3.2indirect
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npmpify5.0.0indirect
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npmpkg-dir4.2.0indirect
npmplatform1.3.6indirect
npmpostcss8.5.10indirect
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npmpostcss-discard-duplicates5.1.0indirect
npmpostcss-discard-empty5.1.1indirect
npmpostcss-discard-overridden5.1.0indirect
npmpostcss-load-config3.1.4indirect
npmpostcss-merge-longhand5.1.7indirect
npmpostcss-merge-rules5.1.4indirect
npmpostcss-minify-font-values5.1.0indirect
npmpostcss-minify-gradients5.1.1indirect
npmpostcss-minify-params5.1.4indirect
npmpostcss-minify-selectors5.2.1indirect
npmpostcss-modules4.3.1indirect
npmpostcss-modules-extract-imports3.0.0indirect
npmpostcss-modules-local-by-default4.0.0indirect
npmpostcss-modules-scope3.0.0indirect
npmpostcss-modules-values4.0.0indirect
npmpostcss-normalize-charset5.1.0indirect
npmpostcss-normalize-display-values5.1.0indirect
npmpostcss-normalize-positions5.1.1indirect
npmpostcss-normalize-repeat-style5.1.1indirect
npmpostcss-normalize-string5.1.0indirect
npmpostcss-normalize-timing-functions5.1.0indirect
npmpostcss-normalize-unicode5.1.1indirect
npmpostcss-normalize-url5.1.0indirect
npmpostcss-normalize-whitespace5.1.1indirect
npmpostcss-ordered-values5.1.3indirect
npmpostcss-reduce-initial5.1.2indirect
npmpostcss-reduce-transforms5.1.0indirect
npmpostcss-selector-parser6.0.12indirect
npmpostcss-svgo5.1.0indirect
npmpostcss-unique-selectors5.1.1indirect
npmpostcss-value-parser4.2.0indirect
npmprettier2.8.8indirect
npmpretty-bytes3.0.1indirect
npmpretty-bytes5.6.0indirect
npmpretty-format30.0.5indirect
npmpromise.series0.2.0indirect
npmpure-rand7.0.1indirect
npmrandombytes2.1.0indirect
npmreact^18.2.0indirect
npmreact-dom^18.2.0indirect
npmreact-is18.3.1indirect
npmreact-scripts^5.0.1indirect
npmregenerate1.4.2indirect
npmregenerate-unicode-properties10.1.0indirect
npmregenerator-transform0.15.1indirect
npmregexp.prototype.flags1.5.0indirect
npmregexpu-core5.3.2indirect
npmregjsparser0.9.1indirect
npmrequire-directory2.1.1indirect
npmresolve1.20.0indirect
npmresolve-cwd3.0.0indirect
npmresolve-from4.0.0indirect
npmresolve-from5.0.0indirect
npmrestore-cursor3.1.0indirect
npmrimraf5.0.1indirect
npmrollup2.80.0indirect
npmrollup-plugin-bundle-size1.0.3indirect
npmrollup-plugin-postcss4.0.2indirect
npmrollup-plugin-terser7.0.2indirect
npmrollup-plugin-typescript20.32.1indirect
npmrollup-plugin-visualizer5.9.0indirect
npmrollup-pluginutils2.8.2indirect
npmsade1.8.1indirect
npmsafe-buffer5.1.2indirect
npmsafe-identifier0.4.2indirect
npmsafe-regex-test1.0.0indirect
npmsax1.5.0indirect
npmsemver6.3.1indirect
npmsemver7.7.2indirect
npmserialize-javascript4.0.0indirect
npmshebang-command2.0.0indirect
npmshebang-regex3.0.0indirect
npmside-channel1.0.4indirect
npmsignal-exit3.0.7indirect
npmsignal-exit4.0.2indirect
npmsignal-exit4.1.0indirect
npmslash3.0.0indirect
npmslice-ansi4.0.0indirect
npmsource-map0.6.1indirect
npmsource-map0.7.4indirect
npmsource-map-js1.2.1indirect
npmsource-map-support0.5.13indirect
npmsource-map-support0.5.21indirect
npmsourcemap-codec1.4.8indirect
npmsprintf-js1.0.3indirect
npmstable0.1.8indirect
npmstack-utils2.0.6indirect
npmstring-hash1.1.3indirect
npmstring-length4.0.2indirect
npmstring-width4.2.3indirect
npmstring-width5.1.2indirect
npmstring.prototype.matchall4.0.8indirect
npmstring.prototype.trim1.2.7indirect
npmstring.prototype.trimend1.0.6indirect
npmstring.prototype.trimstart1.0.6indirect
npmstrip-ansi3.0.1indirect
npmstrip-ansi6.0.1indirect
npmstrip-ansi7.1.0indirect
npmstrip-bom4.0.0indirect
npmstrip-final-newline2.0.0indirect
npmstrip-json-comments3.1.1indirect
npmstyle-inject0.3.0indirect
npmstylehacks5.1.1indirect
npmsupports-color2.0.0indirect
npmsupports-color7.2.0indirect
npmsupports-color8.1.1indirect
npmsvgo2.8.2indirect
npmsynckit0.11.11indirect
npmterser5.17.1indirect
npmtest-exclude6.0.0indirect
npmtiny-glob0.2.9indirect
npmtmpl1.0.5indirect
npmto-regex-range5.0.1indirect
npmts-jest29.4.1indirect
npmts-pattern5.0.5indirect
npmts-pattern^5.5.0indirect
npmtslib2.5.0indirect
npmtype-detect4.0.8indirect
npmtype-fest0.21.3indirect
npmtype-fest4.41.0indirect
npmtyped-array-length1.0.4indirect
npmtypescript4.9.5indirect
npmtypescript5.9.2indirect
npmtypescript^5.4.4indirect
npmuglify-js3.19.3indirect
npmunbox-primitive1.0.2indirect
npmunicode-canonical-property-names-ecmascript2.0.0indirect
npmunicode-match-property-ecmascript2.0.0indirect
npmunicode-match-property-value-ecmascript2.1.0indirect
npmunicode-property-aliases-ecmascript2.1.0indirect
npmuniversalify2.0.0indirect
npmunrs-resolver1.11.1indirect
npmupdate-browserslist-db1.1.3indirect
npmutil-deprecate1.0.2indirect
npmv8-to-istanbul9.3.0indirect
npmwalker1.0.8indirect
npmwhich2.0.2indirect
npmwhich-boxed-primitive1.0.2indirect
npmwhich-typed-array1.1.9indirect
npmwordwrap1.0.0indirect
npmwrap-ansi6.2.0indirect
npmwrap-ansi7.0.0indirect
npmwrap-ansi8.1.0indirect
npmwrappy1.0.2indirect
npmwrite-file-atomic5.0.1indirect
npmy18n5.0.8indirect
npmyallist3.1.1indirect
npmyaml1.10.2indirect
npmyargs17.7.2indirect
npmyargs-parser21.1.1indirect
npmyocto-queue0.1.0indirect
Dependency advisories 12

This repository publishes no package the index resolves, so its own dependency graph was assessed — 677 packages, which also include development and test pins that never ship: 12 carry known advisories, of which 0 are direct. 9 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list.

PackageVersionRelationSeverityAdvisoriesFixed in
brace-expansion1.1.12indirecthigh45.0.9
brace-expansion2.0.2indirecthigh45.0.9
bun1.1.30indirecthigh1
glob10.2.6indirecthigh111.1.0
glob10.4.5indirecthigh111.1.0
js-yaml3.14.1indirecthigh44.3.1
nanoid3.3.11indirecthigh25.1.16
postcss8.5.10indirecthigh38.5.23
serialize-javascript4.0.0indirecthigh17.0.3
svgo2.8.2indirecthigh14.0.2
yaml1.10.2indirectmoderate12.8.3
@babel/core7.28.4indirectlow18.0.0-rc.6

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

Raw JSON report machine-readable

Feedback

Spotted something off in this report, or have thoughts to share? Wrong measurements, missed tooling, ideas, questions — anything is welcome. Every message is read and gets a response.

The message is kept through sign-in.

Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.31.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statisticsnpm.