Allow env_options in `Jinja2Templates

docs/templates.md

@@ -64,6 +64,20 @@ def test_homepage():
     assert "request" in response.context
 ```
 
+## Customizing Jinja2 Environment
+
+`Jinja2Templates` accepts all options supported by Jinja2 `Environment`.
+This will allow more control over the `Enivornment` instance created by Starlette.
+
+For the list of options available to `Environment` you can check Jinja2 documentation [here](https://jinja.palletsprojects.com/en/3.0.x/api/#jinja2.Environment)
+
+```python
+from starlette.templating import Jinja2Templates
+
+
+templates = Jinja2Templates(directory='templates', autoescape=False, auto_reload=True)
+```
+
 ## Asynchronous template rendering
 
 Jinja2 supports async template rendering, however as a general rule

starlette/templating.py

@@ -55,20 +55,25 @@ class Jinja2Templates:
     return templates.TemplateResponse("index.html", {"request": request})
     """
 
-    def __init__(self, directory: typing.Union[str, PathLike]) -> None:
+    def __init__(
+        self, directory: typing.Union[str, PathLike], **env_options: typing.Any
+    ) -> None:
         assert jinja2 is not None, "jinja2 must be installed to use Jinja2Templates"
-        self.env = self._create_env(directory)
+        self.env = self._create_env(directory, **env_options)
 
     def _create_env(
-        self, directory: typing.Union[str, PathLike]
+        self, directory: typing.Union[str, PathLike], **env_options: typing.Any
     ) -> "jinja2.Environment":
         @pass_context
         def url_for(context: dict, name: str, **path_params: typing.Any) -> str:
             request = context["request"]
             return request.url_for(name, **path_params)
 
         loader = jinja2.FileSystemLoader(directory)
-        env = jinja2.Environment(loader=loader, autoescape=True)
+        env_options.setdefault("loader", loader)
+        env_options.setdefault("autoescape", True)
+
+        env = jinja2.Environment(**env_options)
         env.globals["url_for"] = url_for
         return env