{"adoption": {"forks": 61, "observed_at": "2026-08-28T04:07:26.042443+00:00", "stars": 2860}, "canonical_url": "https://ross.abutalabs.com/products/erg", "card": {"archived": false, "artifact_type": "cli-tool", "description": "A statically typed language compatible with Python", "domain": ["programming-languages", "compilers", "developer-tools"], "enriched": true, "function": ["compiler", "programming-language", "type-system", "interpreter", "cli"], "health_score": 67, "homepage": "http://erg-lang.org", "language": "Rust", "license": "Apache-2.0", "license_family": "permissive", "maturity": "active", "member_repos": ["erg-lang/erg"], "name": "erg-lang/erg", "platform": ["windows", "rust", "python", "cross-platform", "cli"], "pushed_at": "2025-12-04T02:20:50+00:00", "repo": "erg-lang/erg", "stars": 2860, "tags": ["statically-typed", "python-interop", "transpiler", "dependent-types", "refinement-types", "language-server", "repl", "linux", "macos"], "topics": ["compiler", "programming-language", "python", "rust", "language", "erg", "transpiler"], "urls": [], "use_cases": ["write statically typed code that interoperates with Python", "catch null errors and out-of-bounds array access at compile time", "gradually replace Python scripts while keeping Python libraries", "use dependent and refinement types to encode preconditions", "get a Rust-like robust language without verbose type annotations", "transpile code to Python bytecode for CPython compatibility"], "what_it_is": "Erg is a statically typed, Python-compatible general-purpose programming language with a powerful type system featuring dependent and refinement types. Its compiler, written in Rust, transpiles Erg code to Python bytecode, giving zero-cost access to the Python ecosystem.", "when_to_avoid": ["you need a mature, production-proven language with a large ecosystem", "you rely on features listed as not yet implemented in the project's TODO", "your team is heavily invested in dynamic Python tooling and workflows", "you need guaranteed stability across releases, as the language is still evolving"], "when_to_choose": ["you want stronger compile-time guarantees than Python offers but need Python library access", "you want an ML-like simple, consistent syntax with powerful type inference", "you want side-effect tracking and maintainability markers in the language", "you want a multi-paradigm functional/OOP language with friendly error messages"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/erg", "repo": "erg-lang/erg", "role": "main", "score": 59}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:07:26.042443+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T08:13:01.148141+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "37ccacd5cf06f49a7afa1494307110c3ed0014208bf9addfc1918cb334e10696", "fetched_at": "2026-08-28T04:07:26.042443+00:00", "kind": "readme", "missing": false, "url": "https://github.com/erg-lang/erg"}, {"content_hash": "0a41bd2d5be4ed6fe8b282a5060a6245fda7bfe0a0245e6034885fe368ea812d", "fetched_at": "2026-08-29T09:52:09.376109+00:00", "kind": "homepage", "missing": false, "url": "http://erg-lang.org"}, {"content_hash": "16537f6590c6bbdc258826ef380ac819924121bbbee0031a93cd0aed081e5644", "fetched_at": "2026-08-29T09:52:09.385745+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/docs"}, {"content_hash": "39f9ef47f74e92d30c36f21f2e5bcff3e438942689bf6de2c908c156e27fe5e8", "fetched_at": "2026-08-29T09:52:09.388545+00:00", "kind": "site_page", "missing": false, "url": "https://erg-lang.org/install"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 55, "longevity": 100, "rhythm": 42}, "computed_at": "2026-09-03T02:39:23.370411+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 1484, "days_push": 273, "days_rel": 386, "gap_med": 17.5, "n_releases_24m": 11}, "score": 59, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}