Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-10-21 18:18 UTC

tc39 / ecma402

Status, process, and documents for ECMA 402

HTMLCustom license★ 609 stars⑂ 119 forkssince Feb 2015View on GitHub ↗

tc39/ecma402 holds a health index of 83 out of 100, placing it in the Excellent band. It scores highest on Sustainability & Governance (86/100) and lowest on AI Readiness (24/100). It was last updated 9 days ago. 3 contributors account for most of its recent work.

overall / 100

Excellent

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 70 is calibrated to 83 on the published index scale (record calibration 2026-08-02).

Ownership

Ecma TC39Organization · verified domain

10,040 followers338 public repossince May 2012

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	@tc39/ecma402-biblio	2.1.1260	2,002	150	9 days ago	ecmascript

Metrics by category

Vitality

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

60Moderate · 21% of overall

Development activity

73Good

How it's scored

28.8/36	Push recency — last push 9 days ago
18/36	Commit cadence — 26/52 weeks with commits
16.1/18	Commit volume — 61 commits in the last year
10/10	OpenSSF Scorecard: Maintained — 13 commit(s) and 9 issue activity found in the last 90 days -- score normalized to 10

Inputs used

commits_last_year	61
human_commit_share	1
days_since_last_push	9
active_weeks_last_year	26

Release discipline

40Weak

How it's scored

27/27	Ships releases — 5 releases published
7.2/36	Release recency — latest release 568 days ago
5.4/27	Release cadence — a release every ~858.7 days
0/10	OpenSSF Scorecard: Signed-Releases — Project has not signed or included provenance with any releases.

Inputs used

releases_count	5
latest_release_tag	es2025-candidate-2025-04-01
releases_from_tags	no
days_since_latest_release	568
mean_days_between_releases	858.7

Community & Adoption

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

73Good · 17% of overall

Popularity & adoption

74Good

How it's scored

45.2/60	Stars — 609 stars
17.3/25	Forks — 119 forks
11.9/15	Watchers — 137 watchers

Inputs used

forks	119
stars	609
watchers	137
growth_state	unverified
growth_factor_pct	100
growth_unverified_reason	no_history

Community health

86Excellent

How it's scored

22.5/22.5	README
16.9/22.5	License — license file present, not a recognized license
18/18	CONTRIBUTING guide
13.5/13.5	Code of conduct
0/7.2	Issue template
6.3/6.3	PR template

Inputs used

has_readme	yes
has_license	yes
readme_badges	0
has_contributing	yes
has_issue_template	no
has_code_of_conduct	yes
readme_badge_services	—
has_pull_request_template	yes

Ecosystem adoption (downloads)

55Moderate

How it's scored

44/80	Monthly downloads — 2,002 downloads/month across npm
0/20	Registry dependents — not reported by this ecosystem

Inputs used

packages	@tc39/ecma402-biblio
dependents	—
ecosystems	npm
total_downloads	—
monthly_downloads	2,002
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?

86Excellent · 23% of overall

Maintainer resilience (bus factor)

77Good

How it's scored

36/54	Bus factor — 3 contributor(s) cover half of all commits
17.9/22.5	Commit distribution — top contributor authored 20% of commits
13.5/13.5	Contributor breadth — 44 contributors
10/10	OpenSSF Scorecard: Contributors — project has 42 contributing companies or organizations

Inputs used

bus_factor	3
contributors_sampled	44
top_contributor_share	0.204

Issue & PR responsiveness

72Good

How it's scored

27.5/42	Issue resolution — 65% of issues closed
26.1/30	PR acceptance — 487/560 decided PRs merged
0/13	Newcomer PR acceptance — no first-time contributor's PR decided in 30d
9/15	OpenSSF Scorecard: Code-Review — Found 17/27 approved changesets -- score normalized to 6

Inputs used

merged_prs	487
open_issues	173
closed_issues	327
prs_merged_7d	0
prs_decided_7d	0
prs_merged_30d	7
prs_decided_30d	7
issue_closed_ratio	0.654
closed_unmerged_prs	73
first_time_authors_30d	0
first_time_prs_merged_30d	0
first_time_prs_decided_30d	0

Excluded from scoring (no data or not applicable): Newcomer PR acceptance. Remaining weights renormalized.

Ownership & stewardship

100Exceptional

How it's scored

30/30	Ownership backing — organization-owned
20/20	Verified domain
25/25	Owner reach — 10,040 followers of tc39
25/25	Track record — 338 public repos, account ~14 yr old

Inputs used

followers	10,040
owner_type	Organization
is_verified	yes
owner_login	tc39
public_repos	338
account_age_days	5,277

Package maintenance

100Exceptional

How it's scored

25/25	Published & resolvable — 1 package(s) on npm
35/35	Publish recency — latest publish 9 days ago
20/20	Version history — 150 published versions
20/20	Not deprecated — active, not deprecated or yanked

Inputs used

packages	@tc39/ecma402-biblio
ecosystems	npm
any_deprecated	no
min_days_since_publish	9

Engineering Quality

Are baseline engineering and documentation practices in place?

80Excellent · 19% of overall

Engineering practices

74Good

How it's scored

24/24	CI workflows — 4 workflow(s)
24/24	Tests present
0/16	Linter config
0/9.6	Pre-commit hooks
6.4/6.4	.editorconfig
20/20	OpenSSF Scorecard: CI-Tests — 21 out of 21 merged PRs checked by a CI test -- score normalized to 10

Inputs used

has_ci	yes
has_tests	yes
has_editorconfig	yes
has_linter_config	no
has_precommit_config	no

Documentation

90Excellent

How it's scored

30/30	README
25/25	Documentation directory
15/15	Documentation / homepage site — https://tc39.es/ecma402/
10/10	Repository description
0/10	Topics
10/10	Wiki

Inputs used

topics	—
has_wiki	yes
homepage	https://tc39.es/ecma402/
docs_site	https://tc39.es/ecma402/
has_readme	yes
has_docs_dir	yes
has_description	yes

Security

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

57Moderate · 16% of overall

Security posture

46Weak

How it's scored

7.5/7.5	Binary-Artifacts — no binaries found in the repo
0/7.5	Branch-Protection — no data
2.5/2.5	CI-Tests — 21 out of 21 merged PRs checked by a CI test -- score normalized to 10
0/2.5	CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
4.5/7.5	Code-Review — Found 17/27 approved changesets -- score normalized to 6
2.5/2.5	Contributors — project has 42 contributing companies or organizations
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
2.2/2.5	License — license file detected
7.5/7.5	Maintained — 13 commit(s) and 9 issue activity found in the last 90 days -- score normalized to 10
0/5	Packaging — no data
0.5/5	Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 1
0/5	SAST — SAST tool is not run on all commits -- score normalized to 0
5/5	Security-Policy — security policy file detected
0/7.5	Signed-Releases — Project has not signed or included provenance with any releases.
0/7.5	Token-Permissions — detected GitHub workflow tokens with excessive permissions
0/7.5	Vulnerabilities — 19 existing vulnerabilities detected

Inputs used

source	openssf_scorecard
checks_evaluated	16
scorecard_version	v5.5.0
checks_inconclusive	2
scorecard_aggregate	4.6

Excluded from scoring (no data or not applicable): Branch-Protection, Packaging. 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	19
affected_packages	9
assessed_packages	168
unassessed_packages	0
affected_by_severity	high 7, moderate 2
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 168 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.

24At Risk · 4% of overall

Agent context & guidance

23At Risk

How it's scored

0/45	Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15	Machine-readable docs (llms.txt)
22.9/40	Legible commit history — 43 of 100 human commits state their intent (structured subject or explanatory body)

Inputs used

has_llms_txt	no
llms_txt_url	—
legible_history_share	0.43
agent_instruction_files	—
agent_instruction_max_bytes	—

Verify loop (build / test / typecheck)

33At Risk

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 100
0/8	Automated maintenance — no automated dependency updates observed
1/10	OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 1

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

1Critical

How it's scored

0/45	Type-checkable code — HTML without a type-check config
0/55	Manageable file sizes — no source files detected

Inputs used

primary_language	HTML
largest_source_bytes	—
source_files_sampled	0
oversized_source_files	0

Excluded from scoring (no data or not applicable): Manageable file sizes. Remaining weights renormalized.

Key facts

609GitHub stars

44contributors

61commits, last 12 months

9days since last push

5releases

3bus factor

173open 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 ★ / 119 ⇿

0Stars

119Forks

5Releases

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 0Minor 0Patch 0

Each point covers 11 days.

OpenSSF Scorecard 4.6 / 10

4.6aggregate

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 · 2026-10-21 18:18 UTC

10	Binary-Artifacts	no binaries found in the repo
n/a	Branch-Protection	internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md
10	CI-Tests	21 out of 21 merged PRs checked by a CI test -- score normalized to 10
0	CII-Best-Practices	no effort to earn an OpenSSF best practices badge detected
6	Code-Review	Found 17/27 approved changesets -- score normalized to 6
10	Contributors	project has 42 contributing companies or organizations
10	Dangerous-Workflow	no dangerous workflow patterns detected
0	Dependency-Update-Tool	no update tool detected
0	Fuzzing	project is not fuzzed
9	License	license file detected
10	Maintained	13 commit(s) and 9 issue activity found in the last 90 days -- score normalized to 10
n/a	Packaging	packaging workflow not detected
1	Pinned-Dependencies	dependency not pinned by hash detected -- score normalized to 1
0	SAST	SAST tool is not run on all commits -- score normalized to 0
10	Security-Policy	security policy file detected
0	Signed-Releases	Project has not signed or included provenance with any releases.
0	Token-Permissions	detected GitHub workflow tokens with excessive permissions
0	Vulnerabilities	19 existing vulnerabilities detected

Direct dependencies 2

Registry	Package	Version constraint	Manifest
npm	ecmarkup	`^24.2.1`	package.json
npm	@tc39/ecma262-biblio	`=2.1.3018`	package.json

All dependencies 168

Full resolved dependency set from the GitHub dependency graph: 2 direct and 166 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

Registry	Package	Version	Relation
npm	@tc39/ecma262-biblio	`2.1.3018`	direct
npm	ecmarkup	`24.2.1`	direct
npm	@asamuzakjp/css-color	`3.1.1`	indirect
npm	@babel/code-frame	`7.12.11`	indirect
npm	@babel/helper-validator-identifier	`7.18.6`	indirect
npm	@babel/highlight	`7.18.6`	indirect
npm	@csstools/color-helpers	`5.0.2`	indirect
npm	@csstools/css-calc	`2.1.2`	indirect
npm	@csstools/css-color-parser	`3.0.8`	indirect
npm	@csstools/css-parser-algorithms	`3.0.4`	indirect
npm	@csstools/css-tokenizer	`3.0.3`	indirect
npm	@esfx/async-canceltoken	`1.0.0`	indirect
npm	@esfx/cancelable	`1.0.0`	indirect
npm	@esfx/canceltoken	`1.0.0`	indirect
npm	@esfx/disposable	`1.0.0`	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	@nodelib/fs.scandir	`2.1.5`	indirect
npm	@nodelib/fs.stat	`2.0.5`	indirect
npm	@nodelib/fs.walk	`1.2.8`	indirect
npm	acorn	`8.17.0`	indirect
npm	agent-base	`7.1.3`	indirect
npm	ansi-styles	`3.2.1`	indirect
npm	ansi-styles	`4.3.0`	indirect
npm	argparse	`1.0.10`	indirect
npm	array-back	`3.1.0`	indirect
npm	array-back	`4.0.2`	indirect
npm	asynckit	`0.4.0`	indirect
npm	boolbase	`1.0.0`	indirect
npm	braces	`3.0.2`	indirect
npm	buffer-from	`1.1.2`	indirect
npm	call-bind-apply-helpers	`1.0.2`	indirect
npm	camel-case	`4.1.2`	indirect
npm	chalk	`2.4.2`	indirect
npm	chalk	`4.1.2`	indirect
npm	clean-css	`5.3.3`	indirect
npm	color-convert	`1.9.3`	indirect
npm	color-convert	`2.0.1`	indirect
npm	color-name	`1.1.3`	indirect
npm	color-name	`1.1.4`	indirect
npm	combined-stream	`1.0.8`	indirect
npm	command-line-args	`5.2.1`	indirect
npm	command-line-usage	`6.1.3`	indirect
npm	commander	`10.0.1`	indirect
npm	commander	`11.1.0`	indirect
npm	commander	`2.20.3`	indirect
npm	css-select	`5.2.2`	indirect
npm	css-tree	`2.2.1`	indirect
npm	css-tree	`3.2.1`	indirect
npm	css-what	`6.2.2`	indirect
npm	csso	`5.0.5`	indirect
npm	cssstyle	`4.3.0`	indirect
npm	data-urls	`5.0.0`	indirect
npm	debug	`4.4.0`	indirect
npm	decimal.js	`10.5.0`	indirect
npm	dedent-js	`1.0.1`	indirect
npm	deep-extend	`0.6.0`	indirect
npm	delayed-stream	`1.0.0`	indirect
npm	dom-serializer	`2.0.0`	indirect
npm	domelementtype	`2.3.0`	indirect
npm	domhandler	`5.0.3`	indirect
npm	domutils	`3.2.2`	indirect
npm	dot-case	`3.0.4`	indirect
npm	dunder-proto	`1.0.1`	indirect
npm	ecmarkdown	`8.1.0`	indirect
npm	entities	`4.5.0`	indirect
npm	es-define-property	`1.0.1`	indirect
npm	es-errors	`1.3.0`	indirect
npm	es-object-atoms	`1.1.1`	indirect
npm	es-set-tostringtag	`2.1.0`	indirect
npm	escape-html	`1.0.3`	indirect
npm	escape-string-regexp	`1.0.5`	indirect
npm	eslint-formatter-codeframe	`7.32.1`	indirect
npm	esprima	`4.0.1`	indirect
npm	fast-glob	`3.2.11`	indirect
npm	fastq	`1.13.0`	indirect
npm	fill-range	`7.0.1`	indirect
npm	find-replace	`3.0.0`	indirect
npm	form-data	`4.0.2`	indirect
npm	function-bind	`1.1.2`	indirect
npm	get-intrinsic	`1.3.0`	indirect
npm	get-proto	`1.0.1`	indirect
npm	glob-parent	`5.1.2`	indirect
npm	gopd	`1.2.0`	indirect
npm	grammarkdown	`3.3.2`	indirect
npm	has-flag	`3.0.0`	indirect
npm	has-flag	`4.0.0`	indirect
npm	has-symbols	`1.1.0`	indirect
npm	has-tostringtag	`1.0.2`	indirect
npm	hasown	`2.0.2`	indirect
npm	highlight.js	`11.0.1`	indirect
npm	html-encoding-sniffer	`4.0.0`	indirect
npm	html-escape	`1.0.2`	indirect
npm	html-minifier-terser	`7.2.0`	indirect
npm	http-proxy-agent	`7.0.2`	indirect
npm	https-proxy-agent	`7.0.6`	indirect
npm	iconv-lite	`0.6.3`	indirect
npm	is-extglob	`2.1.1`	indirect
npm	is-glob	`4.0.3`	indirect
npm	is-number	`7.0.0`	indirect
npm	is-potential-custom-element-name	`1.0.1`	indirect
npm	js-tokens	`4.0.0`	indirect
npm	js-yaml	`3.14.1`	indirect
npm	jsdom	`25.0.1`	indirect
npm	lodash.camelcase	`4.3.0`	indirect
npm	lower-case	`2.0.2`	indirect
npm	lru-cache	`10.4.3`	indirect
npm	math-intrinsics	`1.1.0`	indirect
npm	mdn-data	`2.0.28`	indirect
npm	mdn-data	`2.27.1`	indirect
npm	merge2	`1.4.1`	indirect
npm	micromatch	`4.0.5`	indirect
npm	mime-db	`1.52.0`	indirect
npm	mime-types	`2.1.35`	indirect
npm	ms	`2.1.3`	indirect
npm	no-case	`3.0.4`	indirect
npm	nth-check	`2.1.1`	indirect
npm	nwsapi	`2.2.0`	indirect
npm	nwsapi	`2.2.20`	indirect
npm	param-case	`3.0.4`	indirect
npm	parse5	`6.0.1`	indirect
npm	parse5	`7.2.1`	indirect
npm	pascal-case	`3.1.2`	indirect
npm	picocolors	`1.1.1`	indirect
npm	picomatch	`2.3.1`	indirect
npm	prex	`0.4.7`	indirect
npm	promise-debounce	`1.0.1`	indirect
npm	punycode	`2.3.1`	indirect
npm	queue-microtask	`1.2.3`	indirect
npm	reduce-flatten	`2.0.0`	indirect
npm	relateurl	`0.2.7`	indirect
npm	reusify	`1.0.4`	indirect
npm	rrweb-cssom	`0.7.1`	indirect
npm	rrweb-cssom	`0.8.0`	indirect
npm	run-parallel	`1.2.0`	indirect
npm	safer-buffer	`2.1.2`	indirect
npm	sax	`1.6.0`	indirect
npm	saxes	`6.0.0`	indirect
npm	source-map	`0.6.1`	indirect
npm	source-map-js	`1.2.1`	indirect
npm	source-map-support	`0.5.21`	indirect
npm	sprintf-js	`1.0.3`	indirect
npm	supports-color	`5.5.0`	indirect
npm	supports-color	`7.2.0`	indirect
npm	svgo	`4.0.1`	indirect
npm	symbol-tree	`3.2.4`	indirect
npm	table-layout	`1.0.2`	indirect
npm	terser	`5.48.0`	indirect
npm	tldts	`6.1.85`	indirect
npm	tldts-core	`6.1.85`	indirect
npm	to-regex-range	`5.0.1`	indirect
npm	tough-cookie	`5.1.2`	indirect
npm	tr46	`5.1.0`	indirect
npm	tslib	`2.6.3`	indirect
npm	typical	`4.0.0`	indirect
npm	typical	`5.2.0`	indirect
npm	w3c-xmlserializer	`5.0.0`	indirect
npm	webidl-conversions	`7.0.0`	indirect
npm	whatwg-encoding	`3.1.1`	indirect
npm	whatwg-mimetype	`4.0.0`	indirect
npm	whatwg-url	`14.2.0`	indirect
npm	wordwrapjs	`4.0.1`	indirect
npm	ws	`8.18.1`	indirect
npm	xml-name-validator	`5.0.0`	indirect
npm	xmlchars	`2.2.0`	indirect

Dependency advisories 9

This repository publishes no package the index resolves, so its own dependency graph was assessed — 168 packages, which also include development and test pins that never ship: 9 carry known advisories, of which 0 are direct.

Package	Version	Relation	Severity	Advisories	Fixed in
braces	`3.0.2`	indirect	high	2	`3.0.3`
form-data	`4.0.2`	indirect	high	2	`4.0.6`
js-yaml	`3.14.1`	indirect	high	5	`4.3.2`
picomatch	`2.3.1`	indirect	high	2	`4.0.4`
source-map-js	`1.2.1`	indirect	high	1	`1.2.2`
svgo	`4.0.1`	indirect	high	3	`4.1.0`
ws	`8.18.1`	indirect	high	2	`8.21.0`
micromatch	`4.0.5`	indirect	moderate	1	`4.0.8`
sprintf-js	`1.0.3`	indirect	moderate	1	—

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

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