Christophe Bornet 1de100f278 chore(infra): bump mypy to 2.1 and unify type-check config across the monorepo (#36470) ...

Originally a narrow bump of mypy to `1.20` in four packages. Expanded to
get the whole monorepo onto a single, current mypy and a consistent
type-check configuration, so contributors no longer hit different mypy
versions and divergent behavior depending on which package they touch.

### What changed

- **Unified the mypy pin to `>=2.1.0,<2.2.0`** in every mypy-using
package (6 libs + 14 partners), replacing the previously scattered pins
(`1.10`/`1.17`/`1.18`/`1.19`/`1.20`, with assorted upper bounds).
- **Unified the `[tool.mypy]` base per tier:**
- libs: `plugins = ["pydantic.mypy"]`, `strict = true`,
`enable_error_code = "deprecated"`, `warn_unreachable = true`
  - partners: `disallow_untyped_defs = true`
- Normalized style (`disallow_untyped_defs = "True"` string → bool,
quote/key consistency).
- **Fixed the 20 real errors** mypy 2.1 surfaces: `redundant-cast` from
improved narrowing (`core`, `langchain-classic`), a `var-annotated` for
`_LOGGED`, a return-type widening in `langchain-groq`'s
`_convert_from_v1_to_groq` (it can legitimately return a bare `str`),
and stale `type-arg`/`unused-ignore` in `langchain-model-profiles`
tests.

### Deliberate non-uniformity (documented inline in the relevant
`pyproject.toml`s)

Going fully byte-identical would surface ~196 additional errors that are
*not* real bugs, so two settings are kept package-appropriate:

- **`warn_unreachable`** is enabled on every strict lib **except
`core`**, where it false-flags intentional defensive code — including
the SSRF / IP-policy guards in `_security/` — as unreachable.
- **`pydantic.mypy` plugin** is used only on `anthropic` and
`perplexity` (their code is authored against it and reports ~99/~132
errors without it). It is *not* added to the other partners, where it
only flags the public alias constructor API (e.g. `ChatGroq(model=...)`)
in tests rather than finding bugs.
- **`ollama`** is left on its `ty` type checker; it does not use mypy.

---------

Co-authored-by: Mason Daugherty <github@mdrxy.com>

2026-06-11 00:24:59 -04:00

..

__init__.py

feat(core): mint langchain-model-profiles and add profile property to BaseChatModel (#33728)

2025-10-31 09:44:46 -04:00

test_cli.py

chore(infra): bump mypy to 2.1 and unify type-check config across the monorepo (#36470)

2026-06-11 00:24:59 -04:00