fix(javascript): preserve empty ESM import names in provenance (#2797)

Co-authored-by: LouisChen <3361008+chqcjq@users.noreply.github.com>

src/domain/javascript/javascriptSemanticAnalysis.structure.test.ts

@@ -10,6 +10,45 @@ import {
   origin,
 } from "./javascriptSemanticAnalysis.fixture.js";
 
+describe("JavaScript semantic analysis: ESM import origins", () => {
+  it.each(["", "a", "0"])(
+    "preserves exact ESM import name %j in binding origins",
+    (name) => {
+      const ir = analyzeJavaScriptSemantics(
+        "import { " +
+          JSON.stringify(name) +
+          ' as selected } from "./module.mjs"; const alias = selected; export { alias };',
+      );
+      for (const binding of ["selected", "alias"])
+        expect(origin(topLevelBinding(ir, binding))).toEqual({
+          specifier: "./module.mjs",
+          importedPath: [name],
+        });
+      expect(ir.moduleLinks).toContainEqual(
+        expect.objectContaining({
+          kind: "import",
+          importedName: name,
+          localName: "selected",
+        }),
+      );
+    },
+  );
+
+  it("keeps default and namespace import origins distinct from an empty named import", () => {
+    const ir = analyzeJavaScriptSemantics(
+      'import value from "./module.mjs"; import * as namespace from "./module.mjs";',
+    );
+    expect(origin(topLevelBinding(ir, "value"))).toEqual({
+      specifier: "./module.mjs",
+      importedPath: ["default"],
+    });
+    expect(origin(topLevelBinding(ir, "namespace"))).toEqual({
+      specifier: "./module.mjs",
+      importedPath: [],
+    });
+  });
+});
+
 describe("JavaScript semantic analysis: structure 1", () => {
   it("resolves imports, require destructuring, aliases, assignments, and shadowing", () => {
     const ir = analyzeJavaScriptSemantics(`