add PackageQueryArgs::is_empty()

Author: branchseer

crates/vite_workspace/src/package_filter.rs

@@ -245,6 +245,14 @@ Match packages by name, directory, or glob pattern.
 }
 
 impl PackageQueryArgs {
+    /// Returns `true` if no package selection flags are set.
+    ///
+    /// This is used to determine whether to use the current process's cwd (empty flags)
+    /// or the package paths (non-empty flags) as the cwd of spawned processes.
+    pub fn is_empty(&self) -> bool {
+        !self.recursive && !self.transitive && !self.workspace_root && self.filter.is_empty()
+    }
+
     /// Convert CLI arguments into an opaque [`PackageQuery`].
     ///
     /// `package_name` is the optional package name from a `package#task` specifier.