fix(convert): ClassVar was ignored by Pydantic (#292)

* fix(convert): ClassVar was ignored by Pydantic

Using default factory function instead.

* update comments

Author: jeertmans

manim_slides/convert.py

@@ -9,7 +9,7 @@
 from enum import Enum
 from importlib import resources
 from pathlib import Path
-from typing import Any, Callable, ClassVar, Dict, List, Optional, Type, Union
+from typing import Any, Callable, Dict, List, Optional, Type, Union
 
 import click
 import cv2
@@ -21,6 +21,7 @@
 from pydantic import (
     BaseModel,
     ConfigDict,
+    Field,
     FilePath,
     GetCoreSchemaHandler,
     PositiveFloat,
@@ -303,20 +304,22 @@ class RevealJS(Converter):
     auto_animate_easing: AutoAnimateEasing = AutoAnimateEasing.ease
     auto_animate_duration: float = 1.0
     auto_animate_unmatched: JsBool = JsBool.true
-    auto_animate_styles: ClassVar[List[str]] = [
-        "opacity",
-        "color",
-        "background-color",
-        "padding",
-        "font-size",
-        "line-height",
-        "letter-spacing",
-        "border-width",
-        "border-color",
-        "border-radius",
-        "outline",
-        "outline-offset",
-    ]
+    auto_animate_styles: List[str] = Field(
+        default_factory=lambda: [
+            "opacity",
+            "color",
+            "background-color",
+            "padding",
+            "font-size",
+            "line-height",
+            "letter-spacing",
+            "border-width",
+            "border-color",
+            "border-radius",
+            "outline",
+            "outline-offset",
+        ]
+    )
     auto_slide: AutoSlide = 0
     auto_slide_stoppable: JsBool = JsBool.true
     auto_slide_method: Union[AutoSlideMethod, Function] = AutoSlideMethod.null
@@ -338,11 +341,12 @@ class RevealJS(Converter):
     display: Display = Display.block
     hide_inactive_cursor: JsBool = JsBool.true
     hide_cursor_time: int = 5000
-    # Add. options
+    # Appearance options from RevealJS
     background_color: str = "black"  # TODO: use pydantic.color.Color
     reveal_version: str = "4.6.1"
     reveal_theme: RevealTheme = RevealTheme.black
     title: str = "Manim Slides"
+    # Pydantic options
     model_config = ConfigDict(use_enum_values=True, extra="forbid")
 
     def load_template(self) -> str: