jaseci-labs/jac

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The Jac Programming Language -- The language for any human or AI looking to use one language for everything

Stars: 703
Forks: 384
Open beginner issues: 0
Indexed issues: 148
Avg merge: 1d 12h
Merged PRs (30d): 291

Dominant language: Jac
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 18, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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135 open issues indexed

[Bug]: jac test warm runs spend ~80% of wall time blocked on embedded-postgres session lifecycle Open

bug jaclang

Difficulty 5/5 Over a week Newbie friendliness 35/100

jaseci-labs/jac#9266 · Opened Sep 17, 2026
Jac Scale (0.37.18): a node field written earlier in a request is not visible to a pushed edge-filter query later in the same request, only to the next one Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

jaseci-labs/jac#9264 · Opened Sep 17, 2026
jac fmt (0.37.18) rewrites `n in wanted` inside an edge filter into the identifier `ninwanted`; the formatted file fails jac check and fmt --check refuses the correct spelling Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

jaseci-labs/jac#9263 · Opened Sep 17, 2026
Client: the generated route table imports every page statically, so a file-based app always ships one chunk Open

jaseci-labs/jac#9260 · 1 assignee · Opened Sep 17, 2026
Client codegen: the 81 KB Python-compat prelude is emitted into every compiled module (85 copies, 67% of a 5.2 MB bundle) Open

jaseci-labs/jac#9259 · 1 assignee · Opened Sep 17, 2026
Jac Scale: deploy takes the deployed tree from the entry file's directory, so a workspace with services beside the served app cannot deploy without a root placeholder Open

bug Jac Scale

jaseci-labs/jac#9256 · 1 assignee · Opened Sep 17, 2026
client: no way to code-split the bundle: dynamic import() is E0013 on 0.37, jac.toml rollupOptions overrides silently dropped Open

bug jaclang

Difficulty 5/5 Over a week Newbie friendliness 35/100

jaseci-labs/jac#9255 · 1 comment · Opened Sep 17, 2026
Native backend: dynamic-role edge attach lowers to corrupted pointer store (SIGSEGV) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

jaseci-labs/jac#9253 · Opened Sep 17, 2026
[tracking] Upstream the vendored native-compiler fixes (osprey vendor/jac, base fe4b7c7) Open

jaclang

Difficulty 5/5 Over a week Newbie friendliness 32/100

jaseci-labs/jac#9240 · Opened Sep 16, 2026
struct.unpack rejects bytearray/memoryview buffer views ('non-bytes buffer') — bytes only Open

bug jaclang

Difficulty 4/5 3-5 days Newbie friendliness 55/100

jaseci-labs/jac#9239 · Opened Sep 16, 2026
C-ABI FFI call args: int (i64) into i32 params demotes user calls — needs an explicit narrowing policy (termios/ioctl/fcntl param 1) Open

bug jaclang

Difficulty 5/5 Over a week Newbie friendliness 38/100

jaseci-labs/jac#9238 · Opened Sep 16, 2026
Unannotated glob erases to i64 when imported cross-module — demotes importers with cryptic char/int layout errors Open

bug jaclang

Difficulty 4/5 3-5 days Newbie friendliness 68/100

jaseci-labs/jac#9237 · Opened Sep 16, 2026
Validate KEDA trigger types against KEDA's live ScaledObject Ready condition, not a static allowlist Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

jaseci-labs/jac#9236 · Opened Sep 16, 2026
Type checker: an unannotated lambda param stops inferring once the body has more than one statement Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

jaseci-labs/jac#9222 · Opened Sep 16, 2026
native codegen: a new module with >3 functions + cross-module imports silently produces a no-op binary (runs, exits 0, zero output) Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

jaseci-labs/jac#9202 · Opened Sep 15, 2026
[Bug]: A redeploy keeps the page shell's ETag (mtime 0), so browsers revalidate onto the previous client bundle Open

Difficulty 4/5 3-5 days Newbie friendliness 65/100

jaseci-labs/jac#9195 · Opened Sep 15, 2026
[Bug]: /metrics is empty with more than one serve worker: the collector is built before PROMETHEUS_MULTIPROC_DIR is set Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

jaseci-labs/jac#9190 · Opened Sep 14, 2026
[Bug]: EndpointEffectPass records a walker as a pure read when its ability body is in an impl Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

jaseci-labs/jac#9189 · Opened Sep 14, 2026
jac-scale deploy resolves jac-version through api.github.com unauthenticated; shared-runner 60/h quota 403s abort the deploy Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

jaseci-labs/jac#9187 · Opened Sep 14, 2026
jac.toml ${...}: parser gaps plus no consumer-side check still ship literal placeholders into deploys Open

jaseci-labs/jac#9184 · 1 assignee · Opened Sep 14, 2026
Jac Scale: /graph/data walks and serializes everything reachable from the caller's root in one unbounded response, so opening the graph view on a real app takes the server down Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

jaseci-labs/jac#9183 · Opened Sep 14, 2026
Gateway health monitor never detects a broken KEDA interceptor route Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

jaseci-labs/jac#9182 · Opened Sep 14, 2026
scale: KUBERNETES_SERVICE_HOST alone marks a process as a fleet replica; a lone jac server in a pod loses persistence (0.34.18+) or refuses to boot (0.37) Open

bug Jac Scale

Difficulty 4/5 3-5 days Newbie friendliness 45/100

jaseci-labs/jac#9178 · Opened Sep 14, 2026
Native backend: dict literals store garbage values and key lookup fails for certain literal shapes Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

jaseci-labs/jac#9175 · 1 comment · Opened Sep 13, 2026
CLI fast paths: first .jac import boots the entire compiler; version/help/pay-nothing routes should not Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

jaseci-labs/jac#9165 · 1 comment · Opened Sep 13, 2026
build-kit: eliminate redundant compilation and make caching consistent across the closure Open

bug jaclang

Difficulty 5/5 Over a week Newbie friendliness 25/100

jaseci-labs/jac#9164 · Opened Sep 13, 2026
jac-scale fat bundle vendoring fails for apps with compiled dependencies: --platform manylinux_2_36_<arch> matches none of their wheels Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

jaseci-labs/jac#9161 · Opened Sep 13, 2026
compile() is 40-60x slower than 0.37.13 and leaks native memory since 0.37.14 (#9146), still in 0.37.15; ast.parse, exec and byte-compile are 10-17x slower Open

P0

jaseci-labs/jac#9155 · 6 comments · 1 assignee · Opened Sep 13, 2026
Bug[lsp]: attribute selection through "." shows up as Text type instead of "Lsp" or attribute Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

jaseci-labs/jac#9152 · Opened Sep 12, 2026
intermittent jac lsp errors Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

jaseci-labs/jac#9151 · Opened Sep 12, 2026
Missing ";" from lsp points to start of the next line instead of the line that omits the semicolon Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

jaseci-labs/jac#9150 · Opened Sep 12, 2026
Native codegen: sort key returning str emits invalid LLVM IR (E5020) Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

jaseci-labs/jac#9144 · Opened Sep 12, 2026
Native seal: imported UiSession layout is unavailable across module boundaries Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

jaseci-labs/jac#9145 · Opened Sep 12, 2026
Native: isinstance over OSP hop results refuses an erased candidate (E5092) Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

jaseci-labs/jac#9143 · Opened Sep 12, 2026
Jac Scale: the serve manifest has no format stamp, so a .jab sealed by a pre-#9088 driver boots on 0.37.12 into a KeyError instead of a refusal naming the generation skew Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

jaseci-labs/jac#9140 · Opened Sep 11, 2026
Jac Scale: prepare_application gives no reason when a present _precompiled image is not booted from, so a pod that recompiles or crashes at boot cannot say which sealed check missed Open

Difficulty 3/5 1-2 days Newbie friendliness 88/100

jaseci-labs/jac#9139 · Opened Sep 11, 2026
Jac Scale: the pack ships a .jab without .jac/serve_manifest.json when the bake produces none, so the pod fails at boot instead of the deploy failing on the host Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

jaseci-labs/jac#9138 · Opened Sep 11, 2026
Jac: a cache-warm jac check loses a host's native imports since #9113, so every full-repo jac-check lane is red on jaclang_org Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

jaseci-labs/jac#9137 · Opened Sep 11, 2026
[Docs]: skills drift: server HMR, stdin, port fallback, reserved paths, static files, favicon, client no-dot imports Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 74/100

jaseci-labs/jac#9134 · Opened Sep 11, 2026
Client codegen: calls to a service app's `def:pub` drop the service route, so a colocated app answers 409 `ENDPOINT_CONTRACT_MISMATCH` Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 58/100

jaseci-labs/jac#9133 · Opened Sep 11, 2026
`jac fix placement` turns an `sv import` in a client component into a separate service app Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 65/100

jaseci-labs/jac#9132 · Opened Sep 11, 2026
Client codegen: a non-`:pub` glob is importable only if its own module doesn't use it, and `jac check` misses the failure Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 58/100

jaseci-labs/jac#9131 · Opened Sep 11, 2026
`jac browse` can't find Chromium when `PLAYWRIGHT_BROWSERS_PATH` is set (standard Playwright images) Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

jaseci-labs/jac#9130 · Opened Sep 11, 2026
Jac Scale: first request to `/admin/<path>` freezes the whole server while the admin console builds from source Open

bug Jac Scale

Difficulty 4/5 3-5 days Newbie friendliness 68/100

jaseci-labs/jac#9129 · Opened Sep 11, 2026
Jac Scale: `/jobs` and `/admin/*` platform routes shadow file-based client pages on direct load Open

bug Jac Scale

Difficulty 4/5 3-5 days Newbie friendliness 48/100

jaseci-labs/jac#9128 · Opened Sep 11, 2026
[Bug] JS target: min/max/sorted compare compound values (lists, tuples, bytes) with raw JS </>, not Python's element-wise ordering Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

jaseci-labs/jac#9124 · Opened Sep 11, 2026
[Bug] JS target: a bare builtin function used as a value (e.g. key=len) doesn't resolve Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

jaseci-labs/jac#9123 · Opened Sep 11, 2026
ES target discards builtin keyword-argument names, so `sorted(xs, reverse=True)` throws and reordering kwargs changes a call's meaning Open

jaseci-labs/jac#9120 · 1 assignee · Opened Sep 11, 2026
Jac config: the active profile is decided and applied separately by six config readers, and applying it is not idempotent, so each new reader silently sees a different config Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

jaseci-labs/jac#9116 · Opened Sep 11, 2026
fix(checker): by llm(stream=True) declares the answer type, so async for over its result is E1022 since #9068 Open

jaseci-labs/jac#9114 · 2 comments · 1 assignee · Opened Sep 11, 2026

jaseci-labs/jac

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