feat(py): generate types.py from genkit-schema.json using datamod…

…el-codegen #1807

    ISSUE: #1807

    CHANGELOG:
    - [ ] Add a bin/generate_schema_types script that generates the Pydantic
      types.py module.
    - [ ] Update the pre-commit hooks to ensure this file gets regenerated
      routinely.
    - [ ] Remove timestamp to ensure we do not treat a file with identical
      content differently preventing the hassles of updating this file per
    commit.

py/bin/generate_schema_types

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+#
+# Copyright 2025 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+set -euo pipefail
+
+TOP_DIR=$(git rev-parse --show-toplevel)
+TYPES_FILE="$TOP_DIR/py/packages/genkit/src/genkit/core/types.py"
+
+# Generate types using configuration from pyproject.toml
+uv run --directory "$TOP_DIR/py" datamodel-codegen
+
+# Remove the Model class that uses RootModel
+sed -i '' '/^class Model(RootModel\[Any\]):$/,/^    root: Any$/d' "$TYPES_FILE"
+
+addlicense \
+  -c "Google LLC" \
+  -s=only \
+  "$TYPES_FILE"
+
+uv run --directory "$TOP_DIR/py" \
+  ruff check --fix "$TYPES_FILE"
+
+uv run --directory "$TOP_DIR/py" \
+  ruff format "$TYPES_FILE"

py/captainhook.json

@@ -33,6 +33,9 @@
         {
           "run": "pnpm i --frozen-lockfile"
         },
+        {
+          "run": "py/bin/generate_schema_types"
+        },
         {
           "run": "py/bin/fmt"
         },
@@ -81,6 +84,9 @@
         {
           "run": "pnpm i --frozen-lockfile"
         },
+        {
+          "run": "py/bin/generate_schema_types"
+        },
         {
           "run": "py/bin/fmt"
         },