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[Utility & Helpers](/categories/utility) 4. / 5. hhvm/hsl ActiveLibrary[Utility & Helpers](/categories/utility) hhvm/hsl ======== The Hack Standard Library v4.108.1(5y ago)1151.1M↓32.4%22[2 issues](https://github.com/hhvm/hsl/issues)[4 PRs](https://github.com/hhvm/hsl/pulls)20MITHackCI passing Since Aug 1Pushed 2mo ago21 watchersCompare [ Source](https://github.com/hhvm/hsl)[ Packagist](https://packagist.org/packages/hhvm/hsl)[ RSS](/packages/hhvm-hsl/feed)WikiDiscussions main Synced 1mo ago READMEChangelog (10)Dependencies (5)Versions (65)Used By (20) [![Build Status](https://camo.githubusercontent.com/b994c91ce2f4a6fe85f584821017aea904ef5b726b7ca4c614f45e515967bd37/68747470733a2f2f7472617669732d63692e6f72672f6868766d2f68736c2e7376673f6272616e63683d6d6173746572)](https://travis-ci.org/hhvm/hsl) Hack Standard Library ===================== [](#hack-standard-library) The goal of the Hack Standard Library is to provide a consistent, centralized, well-typed set of APIs for Hack programmers. We aim to achieve this by implementing the library according to codified design principles. This library is especially useful for working with the Hack arrays (`vec`, `keyset`, and `dict`). For future APIs, see [the experimental repository](https://github.com/hhvm/hsl-experimental). Status of this repository ------------------------- [](#status-of-this-repository) As of 2021-05-04, the HSL is moving to be built into HHVM and the typechecker; as such, this repository currently only contains tests. In the near future, we expect this repository to either be archived, or to become a partial mirror of the HHVM repository. The HSL itself remains supported - this is just moving where the code lives. Contributing ------------ [](#contributing) Contributions should be made to the `hphp/hsl` subdirectory of [the HHVM repository](https://github.com/facebook/hhvm/). License ------- [](#license) The Hack Standard Library is MIT-licensed. ### Health Score 60 — FairBetter than 99% of packages Maintenance57 Moderate activity, may be stable Popularity52 Moderate usage in the ecosystem Community45 Growing community involvement Maturity77 Established project with proven stability Bus Factor3 3 contributors hold 50%+ of commits How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window. **Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores. **Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement. **Maturity (30%)** — Project age, version count, PHP version support, and release stability. ### Release Activity Cadence Every ~21 days Total 65 Last Release 1840d ago Major Versions v3.30.0 → v4.0.02019-02-08 v3.27.3 → v4.0.x-dev2020-01-21 v1.4.x-dev → v3.30.x-dev2020-02-19 v3.30.x-dev → v4.0.22020-02-19 v3.30.1 → v4.41.02020-05-01 ### Community Maintainers ![](https://www.gravatar.com/avatar/66d33e29918fd8cc713997dbbe03cb86e2aefbdc6736637641cdffed2f22accb?d=identicon)[fredemmott](/maintainers/fredemmott) ![](https://avatars.githubusercontent.com/u/8306375?v=4)[HHVM Community Bot](/maintainers/hhvm-bot)[@hhvm-bot](https://github.com/hhvm-bot) --- Top Contributors [![fredemmott](https://avatars.githubusercontent.com/u/360927?v=4)](https://github.com/fredemmott "fredemmott (129 commits)")[![kmeht](https://avatars.githubusercontent.com/u/1120478?v=4)](https://github.com/kmeht "kmeht (84 commits)")[![DavidSnider](https://avatars.githubusercontent.com/u/10112104?v=4)](https://github.com/DavidSnider "DavidSnider (59 commits)")[![periodic1236](https://avatars.githubusercontent.com/u/1748071?v=4)](https://github.com/periodic1236 "periodic1236 (25 commits)")[![jjergus](https://avatars.githubusercontent.com/u/2483917?v=4)](https://github.com/jjergus "jjergus (19 commits)")[![WizKid](https://avatars.githubusercontent.com/u/59419?v=4)](https://github.com/WizKid "WizKid (17 commits)")[![lexidor](https://avatars.githubusercontent.com/u/31805625?v=4)](https://github.com/lexidor "lexidor (14 commits)")[![viratyosin](https://avatars.githubusercontent.com/u/6019010?v=4)](https://github.com/viratyosin "viratyosin (12 commits)")[![rodmk](https://avatars.githubusercontent.com/u/2280164?v=4)](https://github.com/rodmk "rodmk (11 commits)")[![hgoldstein](https://avatars.githubusercontent.com/u/5455867?v=4)](https://github.com/hgoldstein "hgoldstein (11 commits)")[![alexeyt](https://avatars.githubusercontent.com/u/727402?v=4)](https://github.com/alexeyt "alexeyt (9 commits)")[![Atry](https://avatars.githubusercontent.com/u/601530?v=4)](https://github.com/Atry "Atry (8 commits)")[![KendallHopkins](https://avatars.githubusercontent.com/u/72923?v=4)](https://github.com/KendallHopkins "KendallHopkins (7 commits)")[![dneiter](https://avatars.githubusercontent.com/u/1376793?v=4)](https://github.com/dneiter "dneiter (7 commits)")[![AndrewDiMola](https://avatars.githubusercontent.com/u/5179225?v=4)](https://github.com/AndrewDiMola "AndrewDiMola (6 commits)")[![shashkambh](https://avatars.githubusercontent.com/u/21209896?v=4)](https://github.com/shashkambh "shashkambh (5 commits)")[![vassilmladenov](https://avatars.githubusercontent.com/u/5396637?v=4)](https://github.com/vassilmladenov "vassilmladenov (5 commits)")[![jano](https://avatars.githubusercontent.com/u/160642?v=4)](https://github.com/jano "jano (5 commits)")[![jtwarren](https://avatars.githubusercontent.com/u/1282605?v=4)](https://github.com/jtwarren "jtwarren (4 commits)")[![billf](https://avatars.githubusercontent.com/u/265988?v=4)](https://github.com/billf "billf (4 commits)") ### Embed Badge ![Health badge](/badges/hhvm-hsl/health.svg) ``` [![Health](https://phpackages.com/badges/hhvm-hsl/health.svg)](https://phpackages.com/packages/hhvm-hsl) ``` PHPackages © 2026 [Directory](/)[Categories](/categories)[Trending](/trending)[Changelog](/changelog)[Analyze](/analyze)