feature: Auto install node by nvm on Linux (#1404)

reflex/constants.py

@@ -116,6 +116,18 @@ BUN_ROOT_PATH = "$HOME/.bun"
 BUN_PATH = get_value("BUN_PATH", f"{BUN_ROOT_PATH}/bin/bun")
 # Command to install bun.
 INSTALL_BUN = f"curl -fsSL https://bun.sh/install | bash -s -- bun-v{MAX_BUN_VERSION}"
+# Command to install nvm.
+INSTALL_NVM = (
+    "curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash"
+)
+# nvm root location.
+NVM_ROOT_PATH = f"$HOME/.nvm"
+# The default path where node is installed.
+NODE_PATH = get_value(
+    "NODE_PATH", f"{NVM_ROOT_PATH}/versions/node/v{MIN_NODE_VERSION}/bin/node"
+)
+# Command to install node.
+INSTALL_NODE = f". {NVM_ROOT_PATH}/nvm.sh && nvm install {MIN_NODE_VERSION}"
 # Default host in dev mode.
 BACKEND_HOST = get_value("BACKEND_HOST", "0.0.0.0")
 # The default timeout when launching the gunicorn server.

reflex/reflex.py

@@ -44,6 +44,7 @@ def init(
     console.rule(f"[bold]Initializing {app_name}")
     # Set up the web directory.
     prerequisites.validate_and_install_bun()
+    prerequisites.validate_and_install_node()
     prerequisites.initialize_web_directory()
 
     # Migrate Pynecone projects to Reflex.

reflex/utils/prerequisites.py

@@ -73,18 +73,9 @@ def get_package_manager() -> str:
 
     Raises:
         FileNotFoundError: If bun or npm is not installed.
-        Exit: If the app directory is invalid.
-
     """
     config = get_config()
 
-    # Check that the node version is valid.
-    if not check_node_version():
-        console.print(
-            f"[red]Node.js version {constants.MIN_NODE_VERSION} or higher is required to run Reflex."
-        )
-        raise typer.Exit()
-
     # On Windows, we use npm instead of bun.
     if platform.system() == "Windows" or config.disable_bun:
         npm_path = path_ops.which("npm")
@@ -276,6 +267,47 @@ def remove_existing_bun_installation():
         path_ops.rm(os.path.expandvars(constants.BUN_ROOT_PATH))
 
 
+def validate_and_install_node():
+    """Validate nodejs have install or not."""
+    if not check_node_version():
+        install_node()
+
+
+def install_node():
+    """Install nvm and nodejs onto the user's system.
+
+
+    Raises:
+        FileNotFoundError: if unzip or curl packages are not found.
+        Exit: if installation failed
+    """
+    if platform.system() != "Windows":
+        # Only install if bun is not already installed.
+        console.log("Installing nvm...")
+
+        # Check if curl is installed
+        curl_path = path_ops.which("curl")
+        if curl_path is None:
+            raise FileNotFoundError("Reflex requires curl to be installed.")
+
+        result = subprocess.run(constants.INSTALL_NVM, shell=True)
+
+        if result.returncode != 0:
+            raise typer.Exit(code=result.returncode)
+
+        console.log("Installing node...")
+        result = subprocess.run(constants.INSTALL_NODE, shell=True)
+
+        if result.returncode != 0:
+            raise typer.Exit(code=result.returncode)
+
+    else:
+        console.print(
+            f"[red]Node.js version {constants.MIN_NODE_VERSION} or higher is required to run Reflex."
+        )
+        raise typer.Exit()
+
+
 def install_bun():
     """Install bun onto the user's system.