[REF-2814]Throw Warning for Projects Created in OneDrive on Windows (#3304)

* Throw Warning for Projects Created in OneDrive on Windows

* precommit

* remove dead code

* REFLEX_USE_NPM escape hatch to opt out of bun

In some unsupported environments, we need to just not use bun. Further
investigation needed.

---------

Co-authored-by: Masen Furer <m_github@0x26.net>

reflex/utils/prerequisites.py

@@ -181,7 +181,12 @@ def get_install_package_manager() -> str | None:
     Returns:
         The path to the package manager.
     """
-    if constants.IS_WINDOWS and not is_windows_bun_supported():
+    if (
+        constants.IS_WINDOWS
+        and not is_windows_bun_supported()
+        or windows_check_onedrive_in_path()
+        or windows_npm_escape_hatch()
+    ):
         return get_package_manager()
     return get_config().bun_path
 
@@ -199,6 +204,24 @@ def get_package_manager() -> str | None:
     return npm_path
 
 
+def windows_check_onedrive_in_path() -> bool:
+    """For windows, check if oneDrive is present in the project dir path.
+
+    Returns:
+        If oneDrive is in the path of the project directory.
+    """
+    return "onedrive" in str(Path.cwd()).lower()
+
+
+def windows_npm_escape_hatch() -> bool:
+    """For windows, if the user sets REFLEX_USE_NPM, use npm instead of bun.
+
+    Returns:
+        If the user has set REFLEX_USE_NPM.
+    """
+    return os.environ.get("REFLEX_USE_NPM", "").lower() in ["true", "1", "yes"]
+
+
 def get_app(reload: bool = False) -> ModuleType:
     """Get the app module based on the default config.
 
@@ -737,10 +760,17 @@ def install_bun():
     Raises:
         FileNotFoundError: If required packages are not found.
     """
-    if constants.IS_WINDOWS and not is_windows_bun_supported():
-        console.warn(
-            "Bun for Windows is currently only available for x86 64-bit Windows. Installation will fall back on npm."
-        )
+    win_supported = is_windows_bun_supported()
+    one_drive_in_path = windows_check_onedrive_in_path()
+    if constants.IS_WINDOWS and not win_supported or one_drive_in_path:
+        if not win_supported:
+            console.warn(
+                "Bun for Windows is currently only available for x86 64-bit Windows. Installation will fall back on npm."
+            )
+        if one_drive_in_path:
+            console.warn(
+                "Creating project directories in OneDrive is not recommended for bun usage on windows. This will fallback to npm."
+            )
 
     # Skip if bun is already installed.
     if os.path.exists(get_config().bun_path) and get_bun_version() == version.parse(
@@ -843,6 +873,7 @@ def install_frontend_packages(packages: set[str], config: Config):
         if not constants.IS_WINDOWS
         or constants.IS_WINDOWS
         and is_windows_bun_supported()
+        and not windows_check_onedrive_in_path()
         else None
     )
     processes.run_process_with_fallback(
@@ -929,6 +960,11 @@ def needs_reinit(frontend: bool = True) -> bool:
             console.warn(
                 f"""On Python < 3.12, `uvicorn==0.20.0` is recommended for improved hot reload times.  Found {uvi_ver} instead."""
             )
+
+        if windows_check_onedrive_in_path():
+            console.warn(
+                "Creating project directories in OneDrive may lead to performance issues. For optimal performance, It is recommended to avoid using OneDrive for your reflex app."
+            )
     # No need to reinitialize if the app is already initialized.
     return False