Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-15 06:18 UTC

MattiasBuelens / web-streams-polyfill

Web Streams, based on the WHATWG spec reference implementation

TypeScript · JavaScriptMIT★ 336 stars⑂ 30 forkssince Dec 2017View on GitHub ↗
KindLibraryhow this is determined
#stream#streams#streams-standard#javascript#polyfill#ponyfill

MattiasBuelens/web-streams-polyfill holds a health index of 77 out of 100, placing it in the Good band. It scores highest on Engineering Quality (74/100) and lowest on AI Readiness (53/100). It was last updated 8 days ago. A single contributor accounts for most of its recent work.

77
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.

77
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 66 is calibrated to 77 on the published index scale (record calibration 2026-08-02).

Ownership

Mattias BuelensPersonal account
139 followers128 public repossince Mar 2011@THEOplayer @DolbyLaboratories

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
npmweb-streams-polyfill4.3.0268,819,19938122 days agostreamswhatwgpolyfill

Metrics by category

Vitality

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

66Good · 21% of overall

Development activity

61Moderate
How it's scored
28.8/36Push recency — last push 8 days ago
11.1/36Commit cadence — 16/52 weeks with commits
17.1/18Commit volume — 80 commits in the last year
4/10OpenSSF Scorecard: Maintained — 5 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 4
Inputs used
commits_last_year80
human_commit_share0.79
days_since_last_push8
active_weeks_last_year16

Release discipline

74Good
How it's scored
27/27Ships releases — 34 releases published
27/36Release recency — latest release 122 days ago
12.6/27Release cadence — a release every ~166.1 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count34
latest_release_tagv4.3.0
releases_from_tagsno
days_since_latest_release122
mean_days_between_releases166.1
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?

73Good · 17% of overall

Popularity & adoption

58Moderate
How it's scored
41/60Stars — 336 stars
12.2/25Forks — 30 forks
4.3/15Watchers — 7 watchers
Inputs used
forks30
stars336
watchers7
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

70Good
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (MIT)
18/18CONTRIBUTING guide
0/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges3
has_contributingyes
has_issue_templateno
has_code_of_conductno
readme_badge_servicesshields.io, travis-ci.com
has_pull_request_templateno

Ecosystem adoption (downloads)

100Exceptional
How it's scored
80/80Monthly downloads — 268,819,199 downloads/month across npm
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagesweb-streams-polyfill
dependents—
ecosystemsnpm
total_downloads—
monthly_downloads268,819,199
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?

62Moderate · 23% of overall

Maintainer resilience (bus factor)

27At Risk
How it's scored
9/54Bus factor — 1 contributor(s) cover half of all commits
1.2/22.5Commit distribution — top contributor authored 95% of commits
6.8/13.5Contributor breadth — 5 contributors
10/10OpenSSF Scorecard: Contributors — project has 6 contributing companies or organizations
Inputs used
bus_factor1
contributors_sampled5
top_contributor_share0.947

Issue & PR responsiveness

71Good
How it's scored
36.2/42Issue resolution — 86% of issues closed
25.2/30PR acceptance — 132/157 decided PRs merged
0/13Newcomer PR acceptance — no first-time contributor's PR decided in 30d
0/15OpenSSF Scorecard: Code-Review — Found 0/5 approved changesets -- score normalized to 0
Inputs used
merged_prs132
open_issues7
closed_issues44
prs_merged_7d0
prs_decided_7d0
prs_merged_30d0
prs_decided_30d0
issue_closed_ratio0.863
closed_unmerged_prs25
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.

Ownership & stewardship

63Moderate
How it's scored
10/30Ownership backing — personal (user) account
0/20Verified domain — not applicable to user accounts
15.4/25Owner reach — 139 followers of MattiasBuelens
25/25Track record — 128 public repos, account ~15 yr old
Inputs used
followers139
owner_typeUser
is_verified—
owner_loginMattiasBuelens
public_repos128
account_age_days5,674
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 1 package(s) on npm
35/35Publish recency — latest publish 122 days ago
20/20Version history — 38 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagesweb-streams-polyfill
ecosystemsnpm
any_deprecatedno
min_days_since_publish122

Engineering Quality

Are baseline engineering and documentation practices in place?

74Good · 19% of overall

Engineering practices

84Excellent
How it's scored
24/24CI workflows — 3 workflow(s)
24/24Tests present
16/16Linter config — eslint.config.mjs
0/9.6Pre-commit hooks
0/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests — 11 out of 11 merged PRs checked by a CI test -- score normalized to 10
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configyes
has_precommit_configno

Documentation

60Moderate
How it's scored
30/30README
0/25Documentation directory
0/15Documentation / homepage site
10/10Repository description
10/10Topics — 6 topics
10/10Wiki
Inputs used
topicsstream, streams, streams-standard, javascript, polyfill, ponyfill
has_wikiyes
homepage—
docs_site—
has_readmeyes
has_docs_dirno
has_descriptionyes

Security

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

59Moderate · 16% of overall

Security posture

49Weak
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
0/7.5Branch-Protection — no data
2.5/2.5CI-Tests — 11 out of 11 merged PRs checked by a CI test -- score normalized to 10
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
0/7.5Code-Review — Found 0/5 approved changesets -- score normalized to 0
2.5/2.5Contributors — project has 6 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
7.5/7.5Dependency-Update-Tool — update tool detected
0/5Fuzzing — project is not fuzzed
2.5/2.5License — license file detected
3/7.5Maintained — 5 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 4
5/5Packaging — packaging workflow detected
4/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 8
0/5SAST — SAST tool is not run on all commits -- score normalized to 0
0/5Security-Policy — security policy file not detected
0/7.5Signed-Releases — no data
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
0/7.5Vulnerabilities — 20 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated16
scorecard_versionv5.5.0
checks_inconclusive2
scorecard_aggregate4.9
Excluded from scoring (no data or not applicable): Branch-Protection, Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisories — no direct dependency carries a known advisory
0/25Indirect dependencies free of known advisories — transitive set not separable from development and test dependencies in this scope
0/40No advisories left outstanding — no advisory carries a publication date
Inputs used
sourceosv
advisories19
affected_packages7
assessed_packages350
unassessed_packages7
affected_by_severityhigh 6, moderate 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 350 resolved dependencies against OSV. 7 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.

53Moderate · 4% of overall

Agent context & guidance

7Critical
How it's scored
0/45Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
7.4/40Legible commit history — 11 of 79 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share0.139
agent_instruction_files—
agent_instruction_max_bytes—

Verify loop (build / test / typecheck)

70Good
How it's scored
0/18One-command bootstrap
22/22Automated tests
11/11Lint / format config — eslint.config.mjs
11/11Static type checking — test/types/tsconfig.json, tsconfig.json
10/10Reproducible environment — lockfile
0/10Demonstrated agent practice — no agent-authored commits among the last 100
8/8Automated maintenance — 21 of the last 100 commits are automated dependency updates
8/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 8
Inputs used
has_nixno
has_testsyes
lockfilespackage-lock.json
has_dockerfileno
typed_languageyes
bootstrap_files—
has_devcontainerno
has_linter_configyes
typecheck_configstest/types/tsconfig.json, tsconfig.json
agent_commit_share0
toolchain_manifests—
dependency_bot_commit_share0.21

Code legibility for models

100Exceptional
How it's scored
45/45Type-checkable code — TypeScript (statically typed)
55/55Manageable file sizes — 0/84 source files over 60KB
Inputs used
primary_languageTypeScript
largest_source_bytes49,335
source_files_sampled84
oversized_source_files0

Key facts

336GitHub stars
5contributors
80commits, last 12 months
8days since last push
34releases
1bus factor
7open 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 ★ / 30 ⇿
0Stars
30Forks
34Releases

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.

0510152025302722018-032022-062026-09
Major 3Minor 10Patch 18

Each point covers 8 days.

OpenSSF Scorecard 4.9 / 10
4.9aggregate

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 · 2026-09-15 06:18 UTC

10Binary-Artifactsno binaries found in the repo
n/aBranch-Protectioninternal 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
10CI-Tests11 out of 11 merged PRs checked by a CI test -- score normalized to 10
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
0Code-ReviewFound 0/5 approved changesets -- score normalized to 0
10Contributorsproject has 6 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
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
10Packagingpackaging workflow detected
8Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 8
0SASTSAST tool is not run on all commits -- score normalized to 0
0Security-Policysecurity policy file not detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
0Vulnerabilities20 existing vulnerabilities detected
All dependencies 357

Full resolved dependency set from the GitHub dependency graph: 0 direct and 357 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

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npmis-core-module2.16.1indirect
npmis-extglob2.1.1indirect
npmis-glob4.0.3indirect
npmis-module1.0.0indirect
npmis-number7.0.0indirect
npmis-plain-object2.0.4indirect
npmis-potential-custom-element-name1.0.1indirect
npmisexe2.0.0indirect
npmisobject3.0.1indirect
npmjest-worker27.5.1indirect
npmjju1.4.0indirect
npmjsdom29.0.1indirect
npmjson-buffer3.0.1indirect
npmjson-schema-traverse0.4.1indirect
npmjson-schema-traverse1.0.0indirect
npmjson-stable-stringify-without-jsonify1.0.1indirect
npmjsonfile6.2.1indirect
npmkeyv4.5.4indirect
npmkind-of6.0.3indirect
npmlevn0.4.1indirect
npmloader-runner4.3.2indirect
npmlocate-path5.0.0indirect
npmlocate-path6.0.0indirect
npmlru-cache11.2.7indirect
npmmagic-string0.30.17indirect
npmmdn-data2.27.1indirect
npmmerge-stream2.0.0indirect
npmmicromatch4.0.8indirect
npmmime3.0.0indirect
npmmime-db1.54.0indirect
npmminimatch10.2.3indirect
npmminimatch10.2.4indirect
npmminimatch10.2.5indirect
npmminimist1.2.8indirect
npmms2.1.3indirect
npmnatural-compare1.4.0indirect
npmnegotiator1.0.0indirect
npmneo-async2.6.2indirect
npmnode-releases2.0.27indirect
npmoptionator0.9.4indirect
npmp-limit2.3.0indirect
npmp-limit3.1.0indirect
npmp-locate4.1.0indirect
npmp-locate5.0.0indirect
npmp-try2.2.0indirect
npmparse58.0.0indirect
npmpath-exists4.0.0indirect
npmpath-key3.1.1indirect
npmpath-parse1.0.7indirect
npmpicocolors1.1.1indirect
npmpicomatch2.3.2indirect
npmpicomatch4.0.4indirect
npmpiscina4.9.2indirect
npmpkg-dir4.2.0indirect
npmplaywright1.60.0indirect
npmplaywright-core1.60.0indirect
npmprelude-ls1.2.1indirect
npmprocess0.11.10indirect
npmpunycode2.3.1indirect
npmreadable-stream4.7.0indirect
npmrechoir0.8.0indirect
npmrequire-from-string2.0.2indirect
npmresolve1.22.10indirect
npmresolve-cwd3.0.0indirect
npmresolve-from5.0.0indirect
npmrollup4.61.1indirect
npmrollup^4.60.0indirect
npmsafe-buffer5.2.1indirect
npmsaxes6.0.0indirect
npmschema-utils4.3.3indirect
npmsemver7.7.4indirect
npmserialize-javascript7.0.5indirect
npmshallow-clone3.0.1indirect
npmshebang-command2.0.0indirect
npmshebang-regex3.0.0indirect
npmsmob1.5.0indirect
npmsource-map0.6.1indirect
npmsource-map-js1.2.1indirect
npmsource-map-support0.5.21indirect
npmsprintf-js1.0.3indirect
npmst3.0.3indirect
npmstring-argv0.3.2indirect
npmstring-width7.2.0indirect
npmstring_decoder1.3.0indirect
npmstrip-ansi7.2.0indirect
npmsupports-color8.1.1indirect
npmsupports-preserve-symlinks-flag1.0.0indirect
npmsymbol-tree3.2.4indirect
npmtapable2.3.3indirect
npmterser5.43.1indirect
npmterser-webpack-plugin5.6.1indirect
npmtest/benchmark-test0.0.0indirect
npmtest/rollup-test0.0.1indirect
npmtest/webpack-test0.0.1indirect
npmtinyglobby0.2.17indirect
npmtldts7.0.27indirect
npmtldts-core7.0.27indirect
npmto-regex-range5.0.1indirect
npmtough-cookie6.0.1indirect
npmtr466.0.0indirect
npmts-api-utils2.5.0indirect
npmtslib2.8.1indirect
npmtype-check0.4.0indirect
npmtypescript5.9.3indirect
npmtypescript6.0.3indirect
npmtypescript-eslint8.61.0indirect
npmundici7.28.0indirect
npmundici-types7.24.6indirect
npmuniversalify2.0.1indirect
npmupdate-browserslist-db1.2.3indirect
npmuri-js4.4.1indirect
npmw3c-xmlserializer5.0.0indirect
npmwatchpack2.5.1indirect
npmweb-streams-polyfill*indirect
npmweb-streams-polyfill4.2.0indirect
npmweb-streams-polyfill^4.2.0indirect
npmwebidl-conversions8.0.1indirect
npmwebpack5.107.2indirect
npmwebpack^5.107.2indirect
npmwebpack-cli7.0.3indirect
npmwebpack-cli^7.0.3indirect
npmwebpack-merge6.0.1indirect
npmwebpack-sources3.5.0indirect
npmwhatwg-mimetype5.0.0indirect
npmwhatwg-url16.0.1indirect
npmwhich2.0.2indirect
npmwildcard2.0.1indirect
npmword-wrap1.2.5indirect
npmwpt-runner7.0.0indirect
npmwrap-ansi9.0.2indirect
npmxml-name-validator5.0.0indirect
npmxmlchars2.2.0indirect
npmy18n5.0.8indirect
npmyargs18.0.0indirect
npmyargs-parser22.0.0indirect
npmyocto-queue0.1.0indirect
Dependency advisories 7

This repository publishes no package the index resolves, so its own dependency graph was assessed — 350 packages, which also include development and test pins that never ship: 7 carry known advisories, of which 0 are direct. 7 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list.

PackageVersionRelationSeverityAdvisoriesFixed in
baseline-browser-mapping2.10.0indirecthigh12.11.0
brace-expansion5.0.6indirecthigh35.0.9
browserslist4.28.1indirecthigh24.28.7
fast-uri3.1.2indirecthigh64.1.3
piscina4.9.2indirecthigh16.0.0-rc.2
undici7.28.0indirecthigh58.9.0
@humanfs/node0.16.6indirectmoderate10.16.8

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

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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.