Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-16 10:17 UTC

ungap / structured-clone

A structuredClone polyfill

JavaScriptISC★ 324 stars⑂ 19 forkssince Oct 2021View on GitHub ↗

ungap/structured-clone holds a health index of 60 out of 100, placing it in the Moderate band. It scores highest on Community & Adoption (64/100) and lowest on AI Readiness (30/100). It was last updated 20 days ago. A single contributor accounts for most of its recent work.

overall / 100

Moderate

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.

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)

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 57 is calibrated to 60 on the published index scale (record calibration 2026-08-02).

Ownership

ungapOrganization

56 followers65 public repossince Nov 2018

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

Registry	Package	Version	Downloads / mo	Versions	Last publish	Tags
npm	@ungap/structured-clone	1.4.0	315,838,886	27	20 days ago	recursion structured clone algorithm

Metrics by category

Vitality

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

61Moderate · 21% of overall

Development activity

53Moderate

How it's scored

28.8/36	Push recency — last push 20 days ago
2.8/36	Commit cadence — 4/52 weeks with commits
11.1/18	Commit volume — 16 commits in the last year
10/10	OpenSSF Scorecard: Maintained — 13 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10

Inputs used

commits_last_year	16
human_commit_share	1
days_since_last_push	20
active_weeks_last_year	4

Release discipline

72Good

How it's scored

16.2/27	Ships releases — 26 version tags (no GitHub releases)
36/36	Release recency — latest release 20 days ago
12.6/27	Release cadence — a release every ~134.6 days
0/10	OpenSSF Scorecard: Signed-Releases — no data

Inputs used

releases_count	26
latest_release_tag	v1.4.0
releases_from_tags	yes
days_since_latest_release	20
mean_days_between_releases	134.6

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?

64Moderate · 17% of overall

Popularity & adoption

53Moderate

How it's scored

40.7/60	Stars — 324 stars
10.5/25	Forks — 19 forks
1.7/15	Watchers — 3 watchers

Inputs used

forks	19
stars	324
watchers	3
growth_state	unverified
growth_factor_pct	100
growth_unverified_reason	no_history

Community health

50Moderate

How it's scored

22.5/22.5	README
22.5/22.5	License — recognized license (ISC)
0/18	CONTRIBUTING guide
0/13.5	Code of conduct
0/7.2	Issue template
0/6.3	PR template

Inputs used

has_readme	yes
has_license	yes
readme_badges	3
has_contributing	no
has_issue_template	no
has_code_of_conduct	no
readme_badge_services	coveralls.io, github.com, shields.io
has_pull_request_template	no

Ecosystem adoption (downloads)

100Exceptional

How it's scored

80/80	Monthly downloads — 315,838,886 downloads/month across npm
0/20	Registry dependents — not reported by this ecosystem

Inputs used

packages	@ungap/structured-clone
dependents	—
ecosystems	npm
total_downloads	—
monthly_downloads	315,838,886
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?

60Moderate · 23% of overall

Maintainer resilience (bus factor)

26At Risk

How it's scored

9/54	Bus factor — 1 contributor(s) cover half of all commits
1.8/22.5	Commit distribution — top contributor authored 92% of commits
5.4/13.5	Contributor breadth — 4 contributors
10/10	OpenSSF Scorecard: Contributors — project has 3 contributing companies or organizations -- score normalized to 10

Inputs used

bus_factor	1
contributors_sampled	4
top_contributor_share	0.921

Issue & PR responsiveness

62Moderate

How it's scored

42/42	Issue resolution — 100% of issues closed
18.5/30	PR acceptance — 8/13 decided PRs merged
0/13	Newcomer PR acceptance — 0/1 first-time contributors' PRs merged in 30d
1.5/15	OpenSSF Scorecard: Code-Review — Found 4/24 approved changesets -- score normalized to 1

Inputs used

merged_prs	8
open_issues	0
closed_issues	14
prs_merged_7d	0
prs_decided_7d	0
prs_merged_30d	1
prs_decided_30d	2
issue_closed_ratio	1
closed_unmerged_prs	5
first_time_authors_30d	1
first_time_prs_merged_30d	0
first_time_prs_decided_30d	1

Ownership & stewardship

68Good

How it's scored

30/30	Ownership backing — organization-owned
0/20	Verified domain
12.6/25	Owner reach — 56 followers of ungap
25/25	Track record — 65 public repos, account ~7 yr old

Inputs used

followers	56
owner_type	Organization
is_verified	no
owner_login	ungap
public_repos	65
account_age_days	2,855

Package maintenance

100Exceptional

How it's scored

25/25	Published & resolvable — 1 package(s) on npm
35/35	Publish recency — latest publish 20 days ago
20/20	Version history — 27 published versions
20/20	Not deprecated — active, not deprecated or yanked

Inputs used

packages	@ungap/structured-clone
ecosystems	npm
any_deprecated	no
min_days_since_publish	20

Engineering Quality

Are baseline engineering and documentation practices in place?

56Moderate · 19% of overall

Engineering practices

60Moderate

How it's scored

24/24	CI workflows — 1 workflow(s)
24/24	Tests present
0/16	Linter config
0/9.6	Pre-commit hooks
0/6.4	.editorconfig
12/20	OpenSSF Scorecard: CI-Tests — 3 out of 5 merged PRs checked by a CI test -- score normalized to 6

Inputs used

has_ci	yes
has_tests	yes
has_editorconfig	no
has_linter_config	no
has_precommit_config	no

Documentation

50Moderate

How it's scored

30/30	README
0/25	Documentation directory
0/15	Documentation / homepage site
10/10	Repository description
0/10	Topics
10/10	Wiki

Inputs used

topics	—
has_wiki	yes
homepage	—
docs_site	—
has_readme	yes
has_docs_dir	no
has_description	yes

Security

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

50Moderate · 16% of overall

Security posture

37Weak

How it's scored

7.5/7.5	Binary-Artifacts — no binaries found in the repo
0/7.5	Branch-Protection — branch protection not enabled on development/release branches
1.5/2.5	CI-Tests — 3 out of 5 merged PRs checked by a CI test -- score normalized to 6
0/2.5	CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
0.8/7.5	Code-Review — Found 4/24 approved changesets -- score normalized to 1
2.5/2.5	Contributors — project has 3 contributing companies or organizations -- score normalized to 10
10/10	Dangerous-Workflow — no dangerous workflow patterns detected
0/7.5	Dependency-Update-Tool — no update tool detected
0/5	Fuzzing — project is not fuzzed
2.5/2.5	License — license file detected
7.5/7.5	Maintained — 13 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
0/5	Packaging — no data
2/5	Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 4
0/5	SAST — SAST tool is not run on all commits -- score normalized to 0
0/5	Security-Policy — security policy file not detected
0/7.5	Signed-Releases — no data
0/7.5	Token-Permissions — detected GitHub workflow tokens with excessive permissions
0/7.5	Vulnerabilities — 11 existing vulnerabilities detected

Inputs used

source	openssf_scorecard
checks_evaluated	16
scorecard_version	v5.5.0
checks_inconclusive	2
scorecard_aggregate	3.7

Excluded from scoring (no data or not applicable): Packaging, Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional

How it's scored

35/35	Direct dependencies free of known advisories — no direct dependency carries a known advisory
0/25	Indirect dependencies free of known advisories — transitive set not separable from development and test dependencies in this scope
0/40	No advisories left outstanding — no advisory carries a publication date

Inputs used

source	osv
advisories	11
affected_packages	7
assessed_packages	166
unassessed_packages	0
affected_by_severity	high 4, moderate 3
direct_affected_packages	0

Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories, No advisories left outstanding. Remaining weights renormalized. Matched 166 resolved dependencies against OSV. 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.

30At Risk · 4% of overall

Agent context & guidance

9Critical

How it's scored

0/45	Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15	Machine-readable docs (llms.txt)
9.3/40	Legible commit history — 11 of 63 human commits state their intent (structured subject or explanatory body)

Inputs used

has_llms_txt	no
llms_txt_url	—
legible_history_share	0.175
agent_instruction_files	—
agent_instruction_max_bytes	—

Verify loop (build / test / typecheck)

36Weak

How it's scored

0/18	One-command bootstrap
22/22	Automated tests
0/11	Lint / format config
0/11	Static type checking
10/10	Reproducible environment — lockfile
0/10	Demonstrated agent practice — no agent-authored commits among the last 63
0/8	Automated maintenance — no automated dependency updates observed
4/10	OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 4

Inputs used

has_nix	no
has_tests	yes
lockfiles	package-lock.json
has_dockerfile	no
typed_language	no
bootstrap_files	—
has_devcontainer	no
has_linter_config	no
typecheck_configs	—
agent_commit_share	0
toolchain_manifests	—
dependency_bot_commit_share	0

Code legibility for models

55Moderate

How it's scored

0/45	Type-checkable code — JavaScript without a type-check config
55/55	Manageable file sizes — 0/14 source files over 60KB

Inputs used

primary_language	JavaScript
largest_source_bytes	7,122
source_files_sampled	14
oversized_source_files	0

Key facts

324GitHub stars

4contributors

16commits, last 12 months

20days since last push

26releases

1bus factor

0open 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 ★ / 19 ⇿

0Stars

19Forks

11Releases

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.

Major 1Minor 3Patch 7

Each point covers 5 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 · 2026-09-16 10:17 UTC

10	Binary-Artifacts	no binaries found in the repo
0	Branch-Protection	branch protection not enabled on development/release branches
6	CI-Tests	3 out of 5 merged PRs checked by a CI test -- score normalized to 6
0	CII-Best-Practices	no effort to earn an OpenSSF best practices badge detected
1	Code-Review	Found 4/24 approved changesets -- score normalized to 1
10	Contributors	project has 3 contributing companies or organizations -- score normalized to 10
10	Dangerous-Workflow	no dangerous workflow patterns detected
0	Dependency-Update-Tool	no update tool detected
0	Fuzzing	project is not fuzzed
10	License	license file detected
10	Maintained	13 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
n/a	Packaging	packaging workflow not detected
4	Pinned-Dependencies	dependency not pinned by hash detected -- score normalized to 4
0	SAST	SAST tool is not run on all commits -- score normalized to 0
0	Security-Policy	security policy file not detected
n/a	Signed-Releases	no releases found
0	Token-Permissions	detected GitHub workflow tokens with excessive permissions
0	Vulnerabilities	11 existing vulnerabilities detected

All dependencies 166

Full resolved dependency set from the GitHub dependency graph: 0 direct and 166 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

Registry	Package	Version	Relation
npm	@babel/helper-string-parser	`7.29.7`	indirect
npm	@babel/helper-validator-identifier	`7.29.7`	indirect
npm	@babel/parser	`7.29.7`	indirect
npm	@babel/types	`7.29.7`	indirect
npm	@bcoe/v8-coverage	`1.0.2`	indirect
npm	@istanbuljs/schema	`0.1.6`	indirect
npm	@jridgewell/gen-mapping	`0.3.13`	indirect
npm	@jridgewell/resolve-uri	`3.1.2`	indirect
npm	@jridgewell/source-map	`0.3.11`	indirect
npm	@jridgewell/sourcemap-codec	`1.5.5`	indirect
npm	@jridgewell/trace-mapping	`0.3.31`	indirect
npm	@rollup/plugin-node-resolve	`16.0.3`	indirect
npm	@rollup/plugin-terser	`1.0.0`	indirect
npm	@rollup/pluginutils	`5.4.0`	indirect
npm	@rollup/rollup-android-arm-eabi	`4.62.2`	indirect
npm	@rollup/rollup-android-arm64	`4.62.2`	indirect
npm	@rollup/rollup-darwin-arm64	`4.62.2`	indirect
npm	@rollup/rollup-darwin-x64	`4.62.2`	indirect
npm	@rollup/rollup-freebsd-arm64	`4.62.2`	indirect
npm	@rollup/rollup-freebsd-x64	`4.62.2`	indirect
npm	@rollup/rollup-linux-arm-gnueabihf	`4.62.2`	indirect
npm	@rollup/rollup-linux-arm-musleabihf	`4.62.2`	indirect
npm	@rollup/rollup-linux-arm64-gnu	`4.62.2`	indirect
npm	@rollup/rollup-linux-arm64-musl	`4.62.2`	indirect
npm	@rollup/rollup-linux-loong64-gnu	`4.62.2`	indirect
npm	@rollup/rollup-linux-loong64-musl	`4.62.2`	indirect
npm	@rollup/rollup-linux-ppc64-gnu	`4.62.2`	indirect
npm	@rollup/rollup-linux-ppc64-musl	`4.62.2`	indirect
npm	@rollup/rollup-linux-riscv64-gnu	`4.62.2`	indirect
npm	@rollup/rollup-linux-riscv64-musl	`4.62.2`	indirect
npm	@rollup/rollup-linux-s390x-gnu	`4.62.2`	indirect
npm	@rollup/rollup-linux-x64-gnu	`4.62.2`	indirect
npm	@rollup/rollup-linux-x64-musl	`4.62.2`	indirect
npm	@rollup/rollup-openbsd-x64	`4.62.2`	indirect
npm	@rollup/rollup-openharmony-arm64	`4.62.2`	indirect
npm	@rollup/rollup-win32-arm64-msvc	`4.62.2`	indirect
npm	@rollup/rollup-win32-ia32-msvc	`4.62.2`	indirect
npm	@rollup/rollup-win32-x64-gnu	`4.62.2`	indirect
npm	@rollup/rollup-win32-x64-msvc	`4.62.2`	indirect
npm	@types/estree	`1.0.9`	indirect
npm	@types/istanbul-lib-coverage	`2.0.6`	indirect
npm	@types/resolve	`1.20.2`	indirect
npm	acorn	`8.17.0`	indirect
npm	ajv	`6.15.0`	indirect
npm	ansi-regex	`6.2.2`	indirect
npm	ansi-styles	`6.2.3`	indirect
npm	argparse	`1.0.10`	indirect
npm	ascjs	`6.0.3`	indirect
npm	asn1	`0.2.6`	indirect
npm	assert-plus	`1.0.0`	indirect
npm	asynckit	`0.4.0`	indirect
npm	aws-sign2	`0.7.0`	indirect
npm	aws4	`1.13.2`	indirect
npm	balanced-match	`4.0.4`	indirect
npm	bcrypt-pbkdf	`1.0.2`	indirect
npm	brace-expansion	`5.0.7`	indirect
npm	buffer-from	`1.1.2`	indirect
npm	c8	`11.0.0`	indirect
npm	caseless	`0.12.0`	indirect
npm	cliui	`9.0.1`	indirect
npm	combined-stream	`1.0.8`	indirect
npm	commander	`2.20.3`	indirect
npm	convert-source-map	`2.0.0`	indirect
npm	core-util-is	`1.0.2`	indirect
npm	coveralls	`3.1.1`	indirect
npm	cross-spawn	`7.0.6`	indirect
npm	dashdash	`1.14.1`	indirect
npm	deepmerge	`4.3.1`	indirect
npm	delayed-stream	`1.0.0`	indirect
npm	ecc-jsbn	`0.1.2`	indirect
npm	emoji-regex	`10.6.0`	indirect
npm	es-errors	`1.3.0`	indirect
npm	escalade	`3.2.0`	indirect
npm	esprima	`4.0.1`	indirect
npm	estree-walker	`2.0.2`	indirect
npm	extend	`3.0.2`	indirect
npm	extsprintf	`1.3.0`	indirect
npm	fast-deep-equal	`3.1.3`	indirect
npm	fast-json-stable-stringify	`2.1.0`	indirect
npm	find-up	`5.0.0`	indirect
npm	foreground-child	`3.3.1`	indirect
npm	forever-agent	`0.6.1`	indirect
npm	form-data	`2.3.3`	indirect
npm	fsevents	`2.3.3`	indirect
npm	function-bind	`1.1.2`	indirect
npm	get-caller-file	`2.0.5`	indirect
npm	get-east-asian-width	`1.6.0`	indirect
npm	getpass	`0.1.7`	indirect
npm	glob	`13.0.6`	indirect
npm	har-schema	`2.0.0`	indirect
npm	har-validator	`5.1.5`	indirect
npm	has-flag	`4.0.0`	indirect
npm	hasown	`2.0.4`	indirect
npm	html-escaper	`2.0.2`	indirect
npm	http-signature	`1.2.0`	indirect
npm	is-core-module	`2.16.2`	indirect
npm	is-module	`1.0.0`	indirect
npm	is-typedarray	`1.0.0`	indirect
npm	isexe	`2.0.0`	indirect
npm	isstream	`0.1.2`	indirect
npm	istanbul-lib-coverage	`3.2.2`	indirect
npm	istanbul-lib-report	`3.0.1`	indirect
npm	istanbul-reports	`3.2.0`	indirect
npm	js-yaml	`3.15.0`	indirect
npm	jsbn	`0.1.1`	indirect
npm	json-schema	`0.4.0`	indirect
npm	json-schema-traverse	`0.4.1`	indirect
npm	json-stringify-safe	`5.0.1`	indirect
npm	jsprim	`1.4.2`	indirect
npm	lcov-parse	`1.0.0`	indirect
npm	locate-path	`6.0.0`	indirect
npm	log-driver	`1.2.7`	indirect
npm	lru-cache	`11.5.2`	indirect
npm	make-dir	`4.0.0`	indirect
npm	mime-db	`1.52.0`	indirect
npm	mime-types	`2.1.35`	indirect
npm	minimatch	`10.2.5`	indirect
npm	minimist	`1.2.8`	indirect
npm	minipass	`7.1.3`	indirect
npm	oauth-sign	`0.9.0`	indirect
npm	p-limit	`3.1.0`	indirect
npm	p-locate	`5.0.0`	indirect
npm	path-exists	`4.0.0`	indirect
npm	path-key	`3.1.1`	indirect
npm	path-parse	`1.0.7`	indirect
npm	path-scurry	`2.0.2`	indirect
npm	performance-now	`2.1.0`	indirect
npm	picomatch	`4.0.5`	indirect
npm	psl	`1.15.0`	indirect
npm	punycode	`2.3.1`	indirect
npm	qs	`6.5.5`	indirect
npm	request	`2.88.2`	indirect
npm	resolve	`1.22.12`	indirect
npm	rollup	`4.62.2`	indirect
npm	safe-buffer	`5.2.1`	indirect
npm	safer-buffer	`2.1.2`	indirect
npm	semver	`7.8.5`	indirect
npm	serialize-javascript	`7.0.7`	indirect
npm	shebang-command	`2.0.0`	indirect
npm	shebang-regex	`3.0.0`	indirect
npm	signal-exit	`4.1.0`	indirect
npm	smob	`1.6.2`	indirect
npm	source-map	`0.6.1`	indirect
npm	source-map-support	`0.5.21`	indirect
npm	sprintf-js	`1.0.3`	indirect
npm	sshpk	`1.18.0`	indirect
npm	string-width	`7.2.0`	indirect
npm	strip-ansi	`7.2.0`	indirect
npm	supports-color	`7.2.0`	indirect
npm	supports-preserve-symlinks-flag	`1.0.0`	indirect
npm	terser	`5.49.0`	indirect
npm	test-exclude	`8.0.0`	indirect
npm	tough-cookie	`2.5.0`	indirect
npm	tunnel-agent	`0.6.0`	indirect
npm	tweetnacl	`0.14.5`	indirect
npm	uri-js	`4.4.1`	indirect
npm	uuid	`3.4.0`	indirect
npm	v8-to-istanbul	`9.3.0`	indirect
npm	verror	`1.10.0`	indirect
npm	which	`2.0.2`	indirect
npm	wrap-ansi	`9.0.2`	indirect
npm	y18n	`5.0.8`	indirect
npm	yargs	`18.0.0`	indirect
npm	yargs-parser	`21.1.1`	indirect
npm	yargs-parser	`22.0.0`	indirect
npm	yocto-queue	`0.1.0`	indirect

Dependency advisories 7

This repository publishes no package the index resolves, so its own dependency graph was assessed — 166 packages, which also include development and test pins that never ship: 7 carry known advisories, of which 0 are direct.

Package	Version	Relation	Severity	Advisories	Fixed in
brace-expansion	`5.0.7`	indirect	high	2	`5.0.9`
form-data	`2.3.3`	indirect	high	2	`4.0.6`
js-yaml	`3.15.0`	indirect	high	2	`4.3.2`
uuid	`3.4.0`	indirect	high	1	`13.0.1`
qs	`6.5.5`	indirect	moderate	2	`6.16.0`
request	`2.88.2`	indirect	moderate	1	`3.0.0`
tough-cookie	`2.5.0`	indirect	moderate	1	`4.1.3`

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.

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 v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statistics — npm.

Software health index

Score profile

Ownership

Package ecosystems

Metrics by category

Key facts

Data collection warnings

More detail

Feedback

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