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nick-hollon-lc
93cb1f87e8
`stream_events(version="v3")` returns `GraphRunStream`, which declares only the four always-registered native projections. Native projections are attached from a registry, so any other one — opt-in built-ins, and projections from transformers in other packages like `tool_calls` (langgraph-prebuilt) or `subagents` (langchain) — was invisible to type checkers, raising `attr-defined`. These returned `Any` before 1.2.10, so the errors are new. - Declare the opt-in native projections this package ships (`updates`, `custom`, `checkpoints`, `debug`, `tasks`). - Add `__getattr__ -> StreamChannel[Any]` to both run streams for projections declared outside this package. The body only raises `AttributeError`, now listing the registered projections; it reads the mux from `__dict__` so a miss before `__init__` can't recurse. Projections owned by other distributions are deliberately not annotated here — that would bind this package's typing surface to another's private module. Precise types for those need a downstream subclass, which composes with this since declared attributes take precedence over `__getattr__`. Tradeoff: a misspelled projection name now type-checks and fails at runtime instead.