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02 — Configuration objects (TypedDicts removed)

Status: Replace live options encoding Depends on: 01-module-reorganization.md Next: 03-markers-attach-config.md

Problem

On main, options are HookspecOpts / HookimplOpts TypedDicts — unvalidated dicts copied around as the live representation. try-claude introduced proper configuration classes; those are the API.

Goals

  • Add HookspecConfiguration and HookimplConfiguration (__slots__, Final, validation).
  • Remove TypedDicts from the live and public API surface.
  • Provide a narrow pytest support shim that accepts mapping/dict-shaped options and converts them to configuration objects (pytest migration only).
  • Export configuration classes from pluggy.

Non-goals

  • Keeping TypedDicts “for compatibility” as a dual API (DECISIONS.md D4).
  • Marker attachment (doc 03) — can land in the same PR if cleaner, but conceptually next.
  • create_hookimpl body (needs NormalImpl/WrapperImpl — doc 04); may stub or add method signature with a TODO.

Target design

# src/pluggy/_config.py

class HookspecConfiguration:
    __slots__ = ("firstresult", "historic", "warn_on_impl", "warn_on_impl_args")
    firstresult: Final[bool]
    historic: Final[bool]
    warn_on_impl: Final[Warning | None]
    warn_on_impl_args: Final[Mapping[str, Warning] | None]

    def __init__(self, firstresult=False, historic=False, ...):
        if historic and firstresult:
            raise ValueError("cannot have a historic firstresult hook")
        ...

class HookimplConfiguration:
    __slots__ = ("wrapper", "hookwrapper", "optionalhook",
                 "tryfirst", "trylast", "specname")
    ...
    # create_hookimpl added in doc 04

Pytest support shim (name flexible — e.g. _pytest_compat.py or helpers in _config.py marked clearly):

def hookspec_config_from_mapping(opts: Mapping[str, Any]) -> HookspecConfiguration:
    """Pytest/support only: accept legacy dict-shaped options."""
    return HookspecConfiguration(
        firstresult=opts.get("firstresult", False),
        historic=opts.get("historic", False),
        warn_on_impl=opts.get("warn_on_impl"),
        warn_on_impl_args=opts.get("warn_on_impl_args"),
    )


def hookimpl_config_from_mapping(opts: Mapping[str, Any]) -> HookimplConfiguration: ...

Do not keep TypedDict classes in __all__. Do not document dicts as the options API. Markers take kwargs that construct configuration objects directly (doc 03).

Reference branch / files

git show try-claude:src/pluggy/_hook_config.py

Port classes from try-claude; then delete the TypedDict definitions from the live module (try still kept them — we go further per D4). Isolate mapping helpers as the only dict-facing surface.

Implementation steps

Step 2.1 — Add configuration classes

Port from try-claude _hook_config.py into _config.py.

Step 2.2 — Remove TypedDicts from live path

  1. Delete HookspecOpts / HookimplOpts TypedDict definitions (or move to a private pytest-shim module if pytest tests in-tree still need the names during transition — prefer deletion + mapping helpers).
  2. Update all internal imports/usages to configuration classes.
  3. Update __init__.py exports: add configuration classes; drop TypedDict exports.

Step 2.3 — Pytest support shim

  1. Add hookspec_config_from_mapping / hookimpl_config_from_mapping.
  2. Document in docstring: for pytest/support migration only, not the public options API.
  3. If pytest (downstream) needs a temporary import path, keep it private (pluggy._config or pluggy._pytest_compat), not in __all__.

Step 2.4 — Tests

  • Validation (historic + firstresult).
  • Mapping shim round-trip.
  • No remaining tests that treat TypedDicts as the primary API.
uv run pytest
uv run pre-commit run -a

Commit message:

feat(config): replace TypedDict options with Hook*Configuration classes

Public API / back-compat

Before After
HookspecOpts / HookimplOpts TypedDicts Removed from public API
dict attrs on marked functions configuration objects (doc 03)
— HookspecConfiguration / HookimplConfiguration exported
— private mapping shim for pytest support

Marker kwargs (firstresult=, wrapper=, …) stay — they construct objects, they are not TypedDict literals.

Tests to add/update

File Coverage
testing/test_configuration.py Class validation; mapping shim
Anything importing TypedDicts Migrate or delete

Done when

  • Configuration classes are the only live options encoding.
  • TypedDicts gone from public __all__ / docs path.
  • Pytest mapping shim exists and is clearly non-API.
  • pytest + pre-commit green.