fix(externals): skip bare scopes as unresolvable

Author: pi0

src/build/plugins/externals.ts

@@ -286,8 +286,11 @@ export function resolveTraceDeps(
   // resolve time and traced explicitly. Force-tracing by name also fixes pnpm,
   // where a nested dependency only resolves from the dependent package's real
   // `.pnpm` location.
+  // Bare scopes (`@scope`) are prefix selectors for the include pattern only:
+  // they are not resolvable package names, so nf3 would warn on them.
   const traceInclude = userTraceDeps.filter(
-    (d): d is string => typeof d === "string" && !negated.has(d)
+    (d): d is string =>
+      typeof d === "string" && !negated.has(d) && !(d.startsWith("@") && !d.includes("/"))
   );
   return {
     includePattern: tracePattern

test/unit/trace-deps.test.ts

@@ -61,6 +61,13 @@ describe("resolveTraceDeps", () => {
     expect(result.traceInclude!.every((d) => typeof d === "string")).toBe(true);
   });
 
+  it("excludes bare scopes from traceInclude but keeps them in the pattern", () => {
+    const result = resolveTraceDeps(["@scope", "@scope/pkg"], defaults);
+    // `@scope` is a prefix selector, not a resolvable package name
+    expect(result.traceInclude).toEqual(["@scope/pkg"]);
+    expect(result.includePattern!.test("/x/node_modules/@scope/other/index.js")).toBe(true);
+  });
+
   it("returns undefined traceInclude when no user deps are declared", () => {
     const result = resolveTraceDeps([], defaults);
     expect(result.traceInclude).toBeUndefined();