smol-rs/event-listener holds a health index of 66 out of 100, placing it in the Moderate band. It scores highest on Sustainability & Governance (72/100) and lowest on AI Readiness (54/100). It was last updated today. A single contributor accounts for most of its recent work.
66
overall / 100
Moderate
Software health index
Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At risk ceiling of 49. AI Readiness sits outside the overall score.
66
Excellent85-100Exemplary; meets essentially all checked criteria
Good70-84Healthy; minor gaps
Moderate50-69Acceptable with notable gaps; review recommended
At risk30-49Significant weaknesses; adoption warrants caution
Critical1-29Severe 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.
How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score.
Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
deps.dev does not index crates:event-listener@5.4.2; advisories assessed against the repository dependency graph instead
No resolved dependencies carried a version and a supported ecosystem
More detail
Star and fork history 0 ★ / 35 ⇿
0Stars
35Forks
16Releases
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 3Minor 5Patch 8
Each point covers 6 days.
OpenSSF Scorecard 6.2 / 10
6.2aggregate
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 · 2026-07-27 22:07 UTC
Full resolved dependency set from the GitHub dependency graph: 3 direct and 8 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.
Registry
Package
Version
Relation
crates.io
critical-section
—
direct
crates.io
pin-project-lite
—
direct
crates.io
portable-atomic-util
—
direct
crates.io
criterion
—
indirect
crates.io
futures-lite
—
indirect
crates.io
loom
—
indirect
crates.io
parking
—
indirect
crates.io
portable-atomic
—
indirect
crates.io
try-lock
—
indirect
crates.io
waker-fn
—
indirect
crates.io
wasm-bindgen-test
—
indirect
Dependency advisories not assessed
Advisory matching could not run for this report: No resolved dependencies carried a version and a supported ecosystem
Raw JSON report machine-readable
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"body": "Updates the requirements on [portable-atomic-util](https://github.com/taiki-e/portable-atomic) to permit the latest version.\n- [Release notes](https://github.com/taiki-e/portable-atomic/releases)\n- [Changelog](https://github.com/taiki-e/portable-atomic/blob/main/CHANGELOG.md)\n- [Commits](https://git\n[…]\ntil-0.1.4...portable-atomic-util-0.2.0)\n\n---\nupdated-dependencies:\n- dependency-name: portable-atomic-util\n dependency-type: direct:production\n...\n\nSigned-off-by: dependabot[bot] <support@github.com>",
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"body": "The notify() function contains two optimizations:\n\n- If the `inner` field is not yet initialized (i.e. no listeners have been\n created yet), it returns `0` from the function early.\n- If the atomic `notified` field indicates that the current notification would\n do nothing, it returns `0` early as w\n[…]\nhis commit removes these\noptimizations in the hope of preventing these deadlocks. Ideally we can restore\nthem in the future.\n\nCloses #138\ncc #130 and #133\n\nSigned-off-by: John Nunley <dev@notgull.net>",
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"body": "Using the std thread local can cause issues when using loom.\r\n\r\ncc https://github.com/smol-rs/parking/issues/23\r\n\r\nSigned-off-by: John Nunley <dev@notgull.net>",
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"headline": "bugfix: Use loom's thread_local when loom is enabled",
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"body": "https://github.com/smol-rs/event-listener/pull/135#discussion_r1606080083\n\nSigned-off-by: John Nunley <dev@notgull.net>",
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"headline": "m: Use Cargo.toml lint fix instead of build.rs",
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"body": "- Suppress warning from the cfg(loom) directive by having it emit\n \"rustc-check-cfg\" in build.rs\n- Remove usage of legacy \"std::usize\" module.\n- Ignore \"clippy::multiple_bound_locations\". We use multiple bounds as a\n workaround for an issue in pin-project-lite where only one bound can be\n assigne\n[…]\nhis library does not tackle as expansive of a range of use cases as\n> pin-project does. If your use case is not already covered, please use\n> pin-project.\n\nSigned-off-by: John Nunley <dev@notgull.net>",
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"headline": "m: Fix new nightly Clippy warnings",
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"body": "This commit adds tests to CI that tests new patches for event-listener\nwith dependent crates. Examples of these dependent crates are:\n\n- event-listener-strategy\n- async-channel\n- async-lock\n\nSigned-off-by: John Nunley <dev@notgull.net>",
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"headline": "ci: Add CI tests for dependent crates",
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"body": null,
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"headline": "feat: Add a loom implementation for event-listener",
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"headline": "docs: Make empty listener panic clearer",
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"body": "Since it has no interior mutability it should be safe to share between\r\nthreads.\r\n\r\nSigned-off-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "feat: Mark StackSlot as Sync",
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"headline": "Merge pull request #117 from smol-rs/notgull/next",
"author_name": "Zeeshan Ali Khan",
"author_login": "zeenix",
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"body": "Signed-off-by: John Nunley <dev@notgull.net>",
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"body": "* Make sure Unpin is implemented for StackListener\n* Purge the prelude\n* Remove unused imports from doctests\n\nSigned-off-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "chore: Polish the implementation of the new API",
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"body": "Signed-off-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "feat: Move Future impl to forwarding macro",
"author_name": "John Nunley",
"author_login": "notgull",
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"headline": "ex: Remove unsafe code from mutex example",
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"body": "It is instantiated with the listener!() macro.\n\nSigned-off-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "feat: Add stack-based listener",
"author_name": "John Nunley",
"author_login": "notgull",
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"body": "This commit creates the Listener trait and moves most of EventListener's\nfunctionality to that trait.\n\nSigned-off-by: John Nunley <dev@notgull.net>",
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"headline": "feat: Create Listener trait",
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"body": "Minimal amount of changes to make EventListener a heap-allocated type\nagain. The existence of the EventListener implies that it is already\nlistening; accordingly the new() and listen() methods on EventListener\nhave been removed.\n\ncc #104\n\nSigned-off-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "feat: Move EventListener back onto the heap",
"author_name": "John Nunley",
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"headline": "chore: Fix up some minor bits before release",
"author_name": "John Nunley",
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{
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"body": null,
"is_bot": false,
"headline": "feat: Add a way to get the current number of listeners",
"author_name": "Linken Quy Dinh",
"author_login": "beckend",
"committed_at": "2024-01-25T04:59:40Z",
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"headline": "Remove RefCell<Option> from PARKER",
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"headline": "Release 4.0.3",
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"oid": "aade0393e85adf73376f0294e2574f8512e65128",
"body": "https://github.com/crossbeam-rs/crossbeam/pull/1056",
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"headline": "Relax MSRV to 1.60",
"author_name": "Taiki Endo",
"author_login": "taiki-e",
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"body": "This respects rust-version field in Cargo.toml, so it removes the need\nto manage MSRV in both the CI file and Cargo.toml.",
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"headline": "ci: Use cargo-hack's --rust-version flag for msrv check",
"author_name": "Taiki Endo",
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"oid": "08c7e163a0d9c3364b57259bc0bf8547a9ca1872",
"body": "Updates the requirements on [criterion](https://github.com/bheisler/criterion.rs) to permit the latest version.\r\n- [Changelog](https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md)\r\n- [Commits](https://github.com/bheisler/criterion.rs/compare/0.4.0...0.5.1)\r\n\r\n---\r\nupdated-dependencies:\r\n- dependency-name: criterion\r\n dependency-type: direct:production\r\n...\r\n\r\nSigned-off-by: dependabot[bot] <support@github.com>",
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"headline": "Update criterion requirement from 0.4.0 to 0.5.1 (#62)",
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"body": "Signed-off-by: John Nunley <dev@notgull.net>",
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"headline": "v4.0.2",
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"author_login": "notgull",
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"headline": "bugfix: Avoid spinning when waiting for deadline",
"author_name": "Anton",
"author_login": "AntonSol919",
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"body": "Signed-off-by: John Nunley <dev@notgull.net>",
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"body": "This commit makes it so EventListener::listen() does not overwrite\nexisting listeners if they already exist. If the listener is already\nregistered in an event listener list, it removes the listener from that\nlist before registering the new listener. This soundness bug was missed\nduring #94.\n\nThis is a patch-compatible fix for #100. We may also want an API-level\nfix for #100 as well. This is up for further discussion.\n\nSigned-off-by: John Nunley <dev@notgull.net>",
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"headline": "bugfix: Remove listener if one already exists",
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"body": "This commit also adds portable-atomic tests for MIRI.\r\n\r\nSigned-off-by: John Nunley <dev@notgull.net>",
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"headline": "Bump MSRV to 1.61 (#102)",
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"body": "This is a breaking change. It makes `new()` take no parameters in its\nsignature and `listen()` take a reference to an event in its signature.\nThis should avoid a footgun where a listener can be waited on without\nlistening on it.\n\nCloses #91\n\nSigned-off-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "breaking: Fix the EventListener::new() footgun",
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"body": "Signed-off-by: John Nunley <dev@notgull.net>",
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"headline": "v3.1.0",
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"oid": "3f0d516c80f9d1e9faf3eba518c8fbedf9f58dff",
"body": null,
"is_bot": false,
"headline": "feat: Implement `UnwindSafe` for `EventListener`",
"author_name": "Pierre Krieger",
"author_login": "tomaka",
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"oid": "c42dc407853368c7eadb02a03a026b2e83b70ac8",
"body": "Updates the requirements on [futures-lite](https://github.com/smol-rs/futures-lite) to permit the latest version.\n- [Release notes](https://github.com/smol-rs/futures-lite/releases)\n- [Changelog](https://github.com/smol-rs/futures-lite/blob/master/CHANGELOG.md)\n- [Commits](https://github.com/smol-rs/futures-lite/compare/v1.12.0...v2.0.0)\n\n---\nupdated-dependencies:\n- dependency-name: futures-lite\n dependency-type: direct:production\n...\n\nSigned-off-by: dependabot[bot] <support@github.com>",
"is_bot": true,
"headline": "Update futures-lite requirement from 1.12.0 to 2.0.0",
"author_name": "dependabot[bot]",
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"headline": "v3.0.1",
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"body": "Co-authored-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "m: Update fmt::Debug to produce new info",
"author_name": "Irine",
"author_login": "mamaicode",
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"body": "Document that EventListeners must be listen'd on",
"is_bot": false,
"headline": "Merge pull request #90 from smol-rs/notgull/new-docs",
"author_name": "Zeeshan Ali Khan",
"author_login": "zeenix",
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"oid": "5c1124135b69080c078c7549a8a8aa56138edea8",
"body": "Signed-off-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "Fix doctest and nitpick",
"author_name": "John Nunley",
"author_login": "notgull",
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"oid": "ac3978ebb4412d44ea2e6910887c6e9268383385",
"body": "In retrospect it is sometimes unclear in the documentation that the new event\nlistener needs to be pinned and inserted into the list before it can receive\nevents. This PR adds documentation that should clarify this issue.\n\nCloses #89\n\nSigned-off-by: John Nunley <dev@notgull.net>",
"is_bot": false,
"headline": "docs: Document that EventListeners must be listen'd on",
"author_name": "John Nunley",
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{
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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 v1.13.0, schema v0.27.0 — full methodology · metrics wiki.
