Only list production dependencies in npm install

src/symbols/npm.rs

@@ -42,7 +42,10 @@ impl<T: AsRef<Path>, C: CommandRunner> Symbol for Install<'_, T, C> {
         "sh",
         args![
           "-c",
-          format!("cd '{}' && npm ls", self.target.as_ref().to_str().unwrap()),
+          format!(
+            "cd '{}' && npm ls --prod",
+            self.target.as_ref().to_str().unwrap()
+          ),
         ],
       )
       .await?;