[REF-1586] [WiP] Use bun as a package manager on windows

Although bun support for windows is currently extremely limited/broken,
eventually we want to migrate over to it for the installation speed gains over
npm.

reflex/constants/compiler.py

@@ -26,6 +26,8 @@ class Ext(SimpleNamespace):
     CSS = ".css"
     # The extension for zip files.
     ZIP = ".zip"
+    # The extension for executable files on Windows.
+    EXE = ".exe"
 
 
 class CompileVars(SimpleNamespace):

reflex/utils/console.py

@@ -27,6 +27,15 @@ def set_log_level(log_level: LogLevel):
     _LOG_LEVEL = log_level
 
 
+def is_debug() -> bool:
+    """Check if the log level is debug.
+
+    Returns:
+        True if the log level is debug.
+    """
+    return _LOG_LEVEL <= LogLevel.DEBUG
+
+
 def print(msg: str, **kwargs):
     """Print a message.
 
@@ -44,7 +53,7 @@ def debug(msg: str, **kwargs):
         msg: The debug message.
         kwargs: Keyword arguments to pass to the print function.
     """
-    if _LOG_LEVEL <= LogLevel.DEBUG:
+    if is_debug():
         msg_ = f"[blue]Debug: {msg}[/blue]"
         if progress := kwargs.pop("progress", None):
             progress.console.print(msg_, **kwargs)

reflex/utils/prerequisites.py

@@ -34,6 +34,8 @@ from reflex.compiler import templates
 from reflex.config import Config, get_config
 from reflex.utils import console, path_ops, processes
 
+CURRENTLY_INSTALLING_NODE = False
+
 
 def check_latest_package_version(package_name: str):
     """Check if the latest version of the package is installed.
@@ -103,8 +105,11 @@ def get_node_version() -> version.Version | None:
     Returns:
         The version of node.
     """
+    node_path = path_ops.get_node_path()
+    if node_path is None:
+        return None
     try:
-        result = processes.new_process([path_ops.get_node_path(), "-v"], run=True)
+        result = processes.new_process([node_path, "-v"], run=True)
         # The output will be in the form "vX.Y.Z", but version.parse() can handle it
         return version.parse(result.stdout)  # type: ignore
     except (FileNotFoundError, TypeError):
@@ -140,16 +145,13 @@ def get_bun_version() -> version.Version | None:
 
 def get_install_package_manager() -> str | None:
     """Get the package manager executable for installation.
-      Currently on unix systems, bun is used for installation only.
+      Currently, bun is used for installation only.
 
     Returns:
         The path to the package manager.
     """
-    # On Windows, we use npm instead of bun.
     if constants.IS_WINDOWS:
-        return get_package_manager()
+        return get_config().bun_path + constants.Ext.EXE
-
-    # On other platforms, we use bun.
     return get_config().bun_path
 
 
@@ -606,6 +608,11 @@ def install_node():
         console.debug("")
         return
 
+    # Skip installation if check_node_version() checks out
+    if check_node_version():
+        console.debug("Skipping node installation as it is already installed.")
+        return
+
     path_ops.mkdir(constants.Fnm.DIR)
     if not os.path.exists(constants.Fnm.EXE):
         download_and_extract_fnm_zip()
@@ -622,10 +629,6 @@ def install_node():
             ],
         )
     else:  # All other platforms (Linux, MacOS).
-        # TODO we can skip installation if check_node_version() checks out
-        if check_node_version():
-            console.debug("Skipping node installation as it is already installed.")
-            return
         # Add execute permissions to fnm executable.
         os.chmod(constants.Fnm.EXE, stat.S_IXUSR)
         # Install node.
@@ -655,11 +658,6 @@ def install_bun():
     Raises:
         FileNotFoundError: If required packages are not found.
     """
-    # Bun is not supported on Windows.
-    if constants.IS_WINDOWS:
-        console.debug("Skipping bun installation on Windows.")
-        return
-
     # Skip if bun is already installed.
     if os.path.exists(get_config().bun_path) and get_bun_version() == version.parse(
         constants.Bun.VERSION
@@ -668,16 +666,25 @@ def install_bun():
         return
 
     #  if unzip is installed
-    unzip_path = path_ops.which("unzip")
+    if constants.IS_WINDOWS:
-    if unzip_path is None:
+        processes.new_process(
-        raise FileNotFoundError("Reflex requires unzip to be installed.")
+            ["powershell", "-c", f"irm {constants.Bun.INSTALL_URL}.ps1|iex"],
+            env={"BUN_INSTALL": constants.Bun.ROOT_PATH},
+            shell=True,
+            run=True,
+            show_logs=console.is_debug(),
+        )
+    else:
+        unzip_path = path_ops.which("unzip")
+        if unzip_path is None:
+            raise FileNotFoundError("Reflex requires unzip to be installed.")
 
-    # Run the bun install script.
+        # Run the bun install script.
-    download_and_run(
+        download_and_run(
-        constants.Bun.INSTALL_URL,
+            constants.Bun.INSTALL_URL,
-        f"bun-v{constants.Bun.VERSION}",
+            f"bun-v{constants.Bun.VERSION}",
-        BUN_INSTALL=constants.Bun.ROOT_PATH,
+            BUN_INSTALL=constants.Bun.ROOT_PATH,
-    )
+        )
 
 
 def _write_cached_procedure_file(payload: str, cache_file: str):
@@ -874,9 +881,6 @@ def validate_frontend_dependencies(init=True):
             )
             raise typer.Exit(1)
 
-    if constants.IS_WINDOWS:
-        return
-
     if init:
         # we only need bun for package install on `reflex init`.
         validate_bun()
@@ -926,8 +930,12 @@ def initialize_frontend_dependencies():
     """Initialize all the frontend dependencies."""
     # validate dependencies before install
     validate_frontend_dependencies()
+    # Avoid warning about Node installation while we're trying to install it.
+    global CURRENTLY_INSTALLING_NODE
+    CURRENTLY_INSTALLING_NODE = True
     # Install the frontend dependencies.
     processes.run_concurrently(install_node, install_bun)
+    CURRENTLY_INSTALLING_NODE = False
     # Set up the web directory.
     initialize_web_directory()
 

reflex/utils/processes.py

@@ -135,13 +135,20 @@ def new_process(args, run: bool = False, show_logs: bool = False, **kwargs):
 
     Returns:
         Execute a child program in a new process.
+
+    Raises:
+        Exit: When attempting to run a command with a None value.
     """
     node_bin_path = path_ops.get_node_bin_path()
-    if not node_bin_path:
+    if not node_bin_path and not prerequisites.CURRENTLY_INSTALLING_NODE:
         console.warn(
             "The path to the Node binary could not be found. Please ensure that Node is properly "
-            "installed and added to your system's PATH environment variable."
+            "installed and added to your system's PATH environment variable or try running "
+            "`reflex init` again."
         )
+    if None in args:
+        console.error(f"Invalid command: {args}")
+        raise typer.Exit(1)
     # Add the node bin path to the PATH environment variable.
     env = {
         **os.environ,