{"id":51316120,"url":"https://github.com/alii/arc","last_synced_at":"2026-07-01T07:30:43.963Z","repository":{"id":339743618,"uuid":"1163196410","full_name":"alii/arc","owner":"alii","description":"⌒ JavaScript on the BEAM","archived":false,"fork":false,"pushed_at":"2026-06-24T23:44:51.000Z","size":27672,"stargazers_count":199,"open_issues_count":0,"forks_count":8,"subscribers_count":1,"default_branch":"master","last_synced_at":"2026-06-25T01:10:35.867Z","etag":null,"topics":["beam","compiler","engine","erlang","javascript"],"latest_commit_sha":null,"homepage":"https://arc.alistair.sh","language":"Gleam","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/alii.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null,"notice":null,"maintainers":null,"copyright":null,"agents":null,"dco":null,"cla":null}},"created_at":"2026-02-21T08:43:32.000Z","updated_at":"2026-06-24T23:44:55.000Z","dependencies_parsed_at":null,"dependency_job_id":"8ec82e0c-668f-4e98-b168-f94540007aea","html_url":"https://github.com/alii/arc","commit_stats":null,"previous_names":["alii/lumen","alii/arc"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/alii/arc","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/alii%2Farc","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/alii%2Farc/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/alii%2Farc/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/alii%2Farc/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/alii","download_url":"https://codeload.github.com/alii/arc/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/alii%2Farc/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":34997946,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-05-26T15:22:16.424Z","status":"online","status_checked_at":"2026-07-01T02:00:05.325Z","response_time":130,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["beam","compiler","engine","erlang","javascript"],"created_at":"2026-07-01T07:30:39.995Z","updated_at":"2026-07-01T07:30:43.941Z","avatar_url":"https://github.com/alii.png","language":"Gleam","funding_links":[],"categories":[],"sub_categories":[],"readme":"\u003e [!NOTE]\n\u003e arc is an **extremely early** research project, tread carefully!\n\n# arc ⌒\n\nJavaScript on the BEAM\n\n\u003cpicture\u003e\n  \u003csource media=\"(prefers-color-scheme: dark)\" srcset=\"./.github/js.png\"\u003e\n  \u003cimg alt=\"js\" src=\"./.github/js-light.png\"\u003e\n\u003c/picture\u003e\n\u003cbr\u003e\u003cbr\u003e\n\nArc is a JavaScript engine written in [Gleam](https://gleam.run) — the whole language, not a subset. It runs wherever the BEAM runs: on Erlang/OTP, and in the browser through [AtomVM](https://www.atomvm.net) compiled to WebAssembly.\n\u003cbr\u003e\u003cbr\u003e\n\nIt implements the language itself — closures, generators, async/await, classes, proxies, typed arrays, plus Intl and Temporal. The engine is small and host-agnostic: it knows nothing about the world outside ECMAScript. You embed it in a BEAM program and give it the globals and host functions you want — timers, I/O, a concurrency model — instead of inheriting a fixed runtime.\n\u003cbr\u003e\u003cbr\u003e\n\nTested against [test262](https://github.com/tc39/test262) on every commit:\n\n\u003cpicture\u003e\n  \u003csource media=\"(prefers-color-scheme: dark)\" srcset=\".github/test262/conformance-dark.png\"\u003e\n  \u003cimg alt=\"test262 conformance chart\" src=\".github/test262/conformance.png\"\u003e\n\u003c/picture\u003e\n\n---\n\n```sh\ngleam run -- file.js       # run a script\ngleam test                 # unit tests\nTEST262_EXEC=1 gleam test  # full test262 suite\nTEST262=1 gleam test       # parser-only test262\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Falii%2Farc","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Falii%2Farc","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Falii%2Farc/lists"}