Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-17 23:16 UTC

EventSource / eventsource

EventSource client for Node.js, browsers and other JavaScript runtimes

TypeScriptMIT★ 1,157 stars⑂ 265 forkssince Feb 2012View on GitHub ↗
KindLibraryhow this is determined
#eventsource#sse#server-sent-events

EventSource/eventsource holds a health index of 81 out of 100, placing it in the Excellent band. It scores highest on Community & Adoption (86/100) and lowest on AI Readiness (56/100). It was last updated 9 days ago. 2 contributors account for most of its recent work.

81
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.

81
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 69 is calibrated to 81 on the published index scale (record calibration 2026-08-02).

Ownership

EventSourceOrganization
13 followers2 public repossince Jan 2017

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

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
npmeventsource5.1.1206,203,1045128 days agoeventsourceserver-sent-eventssse

Metrics by category

Vitality

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

69Good · 21% of overall

Development activity

60Moderate
How it's scored
28.8/36Push recency — last push 9 days ago
6.2/36Commit cadence — 9/52 weeks with commits
15.1/18Commit volume — 47 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year47
human_commit_share0.96
days_since_last_push9
active_weeks_last_year9

Release discipline

83Excellent
How it's scored
27/27Ships releases — 14 releases published
36/36Release recency — latest release 28 days ago
19.8/27Release cadence — a release every ~63.3 days
0/10OpenSSF Scorecard: Signed-Releases — Project has not signed or included provenance with any releases.
Inputs used
releases_count14
latest_release_tagv5.1.1
releases_from_tagsno
days_since_latest_release28
mean_days_between_releases63.3

Community & Adoption

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

86Excellent · 17% of overall

Popularity & adoption

78Good
How it's scored
49.7/60Stars — 1,157 stars
20.2/25Forks — 265 forks
8.1/15Watchers — 30 watchers
Inputs used
forks265
stars1,157
watchers30
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

85Excellent
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (MIT)
18/18CONTRIBUTING guide
13.5/13.5Code 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_conductyes
readme_badge_servicesshields.io
has_pull_request_templateno

Ecosystem adoption (downloads)

100Exceptional
How it's scored
80/80Monthly downloads — 206,203,104 downloads/month across npm
0/20Registry dependents — not reported by this ecosystem
Inputs used
packageseventsource
dependents—
ecosystemsnpm
total_downloads—
monthly_downloads206,203,104
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?

68Good · 23% of overall

Maintainer resilience (bus factor)

63Moderate
How it's scored
25.2/54Bus factor — 2 contributor(s) cover half of all commits
14.4/22.5Commit distribution — top contributor authored 36% of commits
13.5/13.5Contributor breadth — 46 contributors
10/10OpenSSF Scorecard: Contributors — project has 40 contributing companies or organizations
Inputs used
bus_factor2
contributors_sampled46
top_contributor_share0.36

Issue & PR responsiveness

64Moderate
How it's scored
41.6/42Issue resolution — 99% of issues closed
9.1/30PR acceptance — 76/251 decided PRs merged
13/13Newcomer PR acceptance — 1/1 first-time contributors' PRs merged in 30d
0/15OpenSSF Scorecard: Code-Review — Found 1/14 approved changesets -- score normalized to 0
Inputs used
merged_prs76
open_issues1
closed_issues106
prs_merged_7d0
prs_decided_7d0
prs_merged_30d3
prs_decided_30d3
issue_closed_ratio0.991
closed_unmerged_prs175
first_time_authors_30d1
first_time_prs_merged_30d1
first_time_prs_decided_30d1

Ownership & stewardship

54Moderate
How it's scored
30/30Ownership backing — organization-owned
0/20Verified domain
8.2/25Owner reach — 13 followers of EventSource
15.5/25Track record — 2 public repos, account ~9 yr old
Inputs used
followers13
owner_typeOrganization
is_verifiedno
owner_loginEventSource
public_repos2
account_age_days3,531

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 1 package(s) on npm
35/35Publish recency — latest publish 28 days ago
20/20Version history — 51 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packageseventsource
ecosystemsnpm
any_deprecatedno
min_days_since_publish28

Engineering Quality

Are baseline engineering and documentation practices in place?

64Moderate · 19% of overall

Engineering practices

74Good
How it's scored
24/24CI workflows — 3 workflow(s)
24/24Tests present
0/16Linter config
0/9.6Pre-commit hooks
6.4/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests — 10 out of 10 merged PRs checked by a CI test -- score normalized to 10
Inputs used
has_ciyes
has_testsyes
has_editorconfigyes
has_linter_configno
has_precommit_configno

Documentation

50Moderate
How it's scored
30/30README
0/25Documentation directory
0/15Documentation / homepage site
10/10Repository description
10/10Topics — 3 topics
0/10Wiki
Inputs used
topicseventsource, sse, server-sent-events
has_wikino
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?

63Moderate · 16% of overall

Security posture

54Moderate
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
0/7.5Branch-Protection — branch protection not enabled on development/release branches
2.5/2.5CI-Tests — 10 out of 10 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 1/14 approved changesets -- score normalized to 0
2.5/2.5Contributors — project has 40 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
7.5/7.5Maintained — 30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
0/5Packaging — no data
2.5/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 5
0/5SAST — SAST tool is not run on all commits -- score normalized to 0
5/5Security-Policy — security policy file detected
0/7.5Signed-Releases — Project has not signed or included provenance with any releases.
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
6/7.5Vulnerabilities — 2 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated17
scorecard_versionv5.5.0
checks_inconclusive1
scorecard_aggregate5.3
Excluded from scoring (no data or not applicable): Packaging. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisories — no direct dependency carries a known advisory
25/25Indirect dependencies free of known advisories — no indirect dependency carries a known advisory
0/40No advisories left outstanding — no advisory carries a publication date
Inputs used
sourceosv
advisories0
affected_packages0
assessed_packages1
unassessed_packages0
affected_by_severitynone
direct_affected_packages0
Excluded from scoring (no data or not applicable): No advisories left outstanding. Remaining weights renormalized. Matched the npm:eventsource@5.1.1 runtime dependency closure — what installing the published package pulls in — 1 packages. 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.

56Moderate · 4% of overall

Agent context & guidance

40Weak
How it's scored
0/45Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
40/40Legible commit history — 94 of 96 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share0.979
agent_instruction_files—
agent_instruction_max_bytes—

Verify loop (build / test / typecheck)

52Moderate
How it's scored
0/18One-command bootstrap
22/22Automated tests
0/11Lint / format config
11/11Static type checking — tsconfig.json
10/10Reproducible environment — lockfile
4/10Demonstrated agent practice — 2 of the last 100 commits agent-authored or agent-credited
0/8Automated maintenance — no automated dependency updates observed
5/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 5
Inputs used
has_nixno
has_testsyes
lockfilespackage-lock.json
has_dockerfileno
typed_languageyes
bootstrap_files—
has_devcontainerno
has_linter_configno
typecheck_configstsconfig.json
agent_commit_share0.02
toolchain_manifests—
dependency_bot_commit_share0

Code legibility for models

100Exceptional
How it's scored
45/45Type-checkable code — TypeScript (statically typed)
55/55Manageable file sizes — 0/21 source files over 60KB
Inputs used
primary_languageTypeScript
largest_source_bytes34,681
source_files_sampled21
oversized_source_files0

Key facts

1,157GitHub stars
46contributors
47commits, last 12 months
9days since last push
14releases
2bus factor
1open 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 ★ / 265 ⇿
0Stars
265Forks
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.

0408012016020024023952012-022019-052026-08
Major 2Minor 1Patch 8

Each point covers 14 days.

OpenSSF Scorecard 5.3 / 10
5.3aggregate

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 · 2026-09-17 23:15 UTC

10Binary-Artifactsno binaries found in the repo
0Branch-Protectionbranch protection not enabled on development/release branches
10CI-Tests10 out of 10 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 1/14 approved changesets -- score normalized to 0
10Contributorsproject has 40 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
n/aPackagingpackaging workflow not detected
5Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 5
0SASTSAST tool is not run on all commits -- score normalized to 0
10Security-Policysecurity policy file detected
0Signed-ReleasesProject has not signed or included provenance with any releases.
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
8Vulnerabilities2 existing vulnerabilities detected
Direct dependencies 1
RegistryPackageVersion constraintManifest
npmeventsource-parser^4.1.0package.json
All dependencies 280

Full resolved dependency set from the GitHub dependency graph: 1 direct and 279 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
npmeventsource-parser4.1.0direct
npm@blazediff/core1.9.1indirect
npm@changesets/apply-release-plan8.0.0indirect
npm@changesets/assemble-release-plan7.0.0indirect
npm@changesets/changelog-git1.0.0indirect
npm@changesets/changelog-github1.0.0indirect
npm@changesets/cli3.0.0indirect
npm@changesets/config4.0.0indirect
npm@changesets/errors1.0.0indirect
npm@changesets/format0.1.1indirect
npm@changesets/get-dependents-graph3.0.0indirect
npm@changesets/get-github-info1.0.0indirect
npm@changesets/git4.0.0indirect
npm@changesets/parse1.0.0indirect
npm@changesets/pre3.0.0indirect
npm@changesets/read1.0.0indirect
npm@changesets/should-skip-package1.0.0indirect
npm@changesets/types7.0.0indirect
npm@changesets/write1.0.0indirect
npm@clack/core1.4.3indirect
npm@clack/prompts1.7.0indirect
npm@cloudflare/kv-asset-handler0.5.0indirect
npm@cloudflare/unenv-preset2.16.1indirect
npm@cloudflare/vitest-pool-workers0.21.3indirect
npm@cloudflare/workerd-darwin-641.20260811.1indirect
npm@cloudflare/workerd-darwin-arm641.20260811.1indirect
npm@cloudflare/workerd-linux-641.20260811.1indirect
npm@cloudflare/workerd-linux-arm641.20260811.1indirect
npm@cloudflare/workerd-windows-641.20260811.1indirect
npm@cspotcode/source-map-support0.8.1indirect
npm@emnapi/runtime1.11.3indirect
npm@esbuild/aix-ppc640.28.1indirect
npm@esbuild/android-arm0.28.1indirect
npm@esbuild/android-arm640.28.1indirect
npm@esbuild/android-x640.28.1indirect
npm@esbuild/darwin-arm640.28.1indirect
npm@esbuild/darwin-x640.28.1indirect
npm@esbuild/freebsd-arm640.28.1indirect
npm@esbuild/freebsd-x640.28.1indirect
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npm@esbuild/linux-arm640.28.1indirect
npm@esbuild/linux-ia320.28.1indirect
npm@esbuild/linux-loong640.28.1indirect
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npm@esbuild/linux-s390x0.28.1indirect
npm@esbuild/linux-x640.28.1indirect
npm@esbuild/netbsd-arm640.28.1indirect
npm@esbuild/netbsd-x640.28.1indirect
npm@esbuild/openbsd-arm640.28.1indirect
npm@esbuild/openbsd-x640.28.1indirect
npm@esbuild/openharmony-arm640.28.1indirect
npm@esbuild/sunos-x640.28.1indirect
npm@esbuild/win32-arm640.28.1indirect
npm@esbuild/win32-ia320.28.1indirect
npm@esbuild/win32-x640.28.1indirect
npm@img/colour1.1.0indirect
npm@img/sharp-darwin-arm640.35.2indirect
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npm@img/sharp-libvips-darwin-arm641.3.1indirect
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npm@img/sharp-libvips-linux-ppc641.3.1indirect
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npm@img/sharp-libvips-linux-x641.3.1indirect
npm@img/sharp-libvips-linuxmusl-arm641.3.1indirect
npm@img/sharp-libvips-linuxmusl-x641.3.1indirect
npm@img/sharp-linux-arm0.35.2indirect
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npm@oxfmt/binding-darwin-x640.52.0indirect
npm@oxfmt/binding-freebsd-x640.52.0indirect
npm@oxfmt/binding-linux-arm-gnueabihf0.52.0indirect
npm@oxfmt/binding-linux-arm-musleabihf0.52.0indirect
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npm@oxfmt/binding-openharmony-arm640.52.0indirect
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npm@vitest/spy4.1.10indirect
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npmcac7.0.0indirect
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npmcjs-module-lexer1.2.3indirect
npmconvert-source-map2.0.0indirect
npmcookie1.1.1indirect
npmdataloader2.2.3indirect
npmdetect-libc2.1.2indirect
npmentities7.0.1indirect
npmerror-stack-parser-es1.0.5indirect
npmes-module-lexer2.3.1indirect
npmesbuild0.28.1indirect
npmestree-walker3.0.3indirect
npmeventsource-encoder1.0.2indirect
npmexpect-type1.4.0indirect
npmfast-string-truncated-width3.0.3indirect
npmfast-string-width3.0.2indirect
npmfast-wrap-ansi0.2.2indirect
npmfdir6.5.0indirect
npmfsevents2.3.2indirect
npmfsevents2.3.3indirect
npmhappy-dom20.11.2indirect
npmhuman-id4.2.0indirect
npmimport-meta-resolve4.2.0indirect
npmjju1.4.0indirect
npmjsonc-parser3.3.1indirect
npmkleur4.1.5indirect
npmlaunch-editor2.14.1indirect
npmlightningcss1.33.0indirect
npmlightningcss-android-arm641.33.0indirect
npmlightningcss-darwin-arm641.33.0indirect
npmlightningcss-darwin-x641.33.0indirect
npmlightningcss-freebsd-x641.33.0indirect
npmlightningcss-linux-arm-gnueabihf1.33.0indirect
npmlightningcss-linux-arm64-gnu1.33.0indirect
npmlightningcss-linux-arm64-musl1.33.0indirect
npmlightningcss-linux-x64-gnu1.33.0indirect
npmlightningcss-linux-x64-musl1.33.0indirect
npmlightningcss-win32-arm64-msvc1.33.0indirect
npmlightningcss-win32-x64-msvc1.33.0indirect
npmmagic-string0.30.21indirect
npmminiflare5.20260811.1-alphaindirect
npmmrmime2.0.1indirect
npmnanoid3.3.18indirect
npmobug2.1.4indirect
npmoxfmt0.52.0indirect
npmoxlint1.78.0indirect
npmpackage-manager-detector1.8.0indirect
npmpath-to-regexp6.3.0indirect
npmpathe2.0.3indirect
npmpicocolors1.1.1indirect
npmpicomatch4.0.5indirect
npmplaywright1.62.1indirect
npmplaywright-core1.62.1indirect
npmpngjs7.0.0indirect
npmpostcss8.5.26indirect
npmrolldown1.2.4indirect
npmsemver7.8.5indirect
npmsharp0.35.2indirect
npmshell-quote1.10.0indirect
npmsiginfo2.0.0indirect
npmsirv3.0.2indirect
npmsisteransi1.0.5indirect
npmsource-map-js1.2.1indirect
npmstackback0.0.2indirect
npmstd-env4.2.0indirect
npmsupports-color10.2.2indirect
npmtinybench2.9.0indirect
npmtinyexec1.3.0indirect
npmtinyglobby0.2.17indirect
npmtinypool2.1.0indirect
npmtinyrainbow3.1.1indirect
npmtotalist3.0.1indirect
npmtslib2.8.1indirect
npmtypescript7.0.2indirect
npmundici7.29.0indirect
npmundici-types6.21.0indirect
npmunenv2.0.0-rc.24indirect
npmvite8.2.1indirect
npmvitest4.1.10indirect
npmwhatwg-mimetype3.0.0indirect
npmwhy-is-node-running2.3.0indirect
npmworkerd1.20260811.1indirect
npmwrangler4.123.0indirect
npmws8.21.0indirect
npmws8.21.3indirect
npmyaml2.9.0indirect
npmyouch4.1.0-beta.10indirect
npmyouch-core0.3.3indirect
npmzod4.4.3indirect
Dependency advisories 0

Installing npm:eventsource@5.1.1 pulls in 1 packages, direct and transitive: 0 carry known advisories, of which 0 are direct dependencies.

No known advisories affect the assessed dependencies.

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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77kibertoad/opinionated-machineVery opinionated DI framework for fastify, built on top of awilixGood69rexxars/eventsource-parserStreaming, source-agnostic EventSource/Server-Sent Events parserGood47instantdb/eventsourceEventSource client for Node.js, browsers and other JavaScript runtimesWeak92centrifugal/centrifugoScalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably, socket.io, Phoenix.PubSub, SignalR. Set up once and forever.Excellent93Rotorsoft/act-rootEvent-sourcing framework for TypeScript. Three primitives (actions, state, reactions), Zod end to end, no broker required. Postgres, SQLite, or in-memory.Exceptional89Atmosphere/atmospherePortable AI agent runtime for the JVM. One @Agent class runs on Spring AI, LangChain4j, Anthropic, or 9 more behind one SPI. Token streaming, tool calls, human approvals, and governance over WebSocket, SSE, gRPC, or WebTransport/HTTP3. Speaks MCP, A2A, and AG-UI.Excellent

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.