Handle javascript dependencies.

src/frontend/lib/objects.py

@@ -0,0 +1,23 @@
+"""pyShelf's Frontend Objects."""
+from sys import exit
+from shutil import which
+from subprocess import run
+from pathlib import Path
+from ...backend.lib.config import Config
+
+
+class JSInterface():
+    """A class to interface with the JavaScript side of pyShelf."""
+
+    def __init__(self, config: Config):
+        """Initialize the JSInterface object."""
+        self.package_json: Path = Path(config.root, "src/frontend/package.json")
+        self.config: Config = config
+
+    def install(self):
+        """Install the JavaScript dependencies."""
+        if which("npm"):
+            run(["npm", "install"], cwd=self.package_json.parent)
+        else:
+            self.config.logger.error("npm is not installed.")
+            exit(1)