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test/regression/issue/5344/a.fixture.ts

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+export { b } from "./b.fixture.ts";

test/regression/issue/5344/b.fixture.ts

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+export function b() {
+  return "b";
+}

test/regression/issue/5344/double_export.test.ts

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+import * as fs from "fs/promises";
+
+test("no double export", async () => {
+  await fs.rm(import.meta.dir + "/dist", { recursive: true, force: true });
+
+  await Bun.build({
+    entrypoints: [import.meta.dir + "/a.fixture.ts", import.meta.dir + "/b.fixture.ts"],
+    splitting: true,
+    outdir: import.meta.dir + "/dist",
+  });
+
+  // @ts-ignore
+  const { b } = await import("./dist/a.fixture.js");
+  expect(b()).toBe("b");
+  // should not throw
+});