deno bundle (1.10.3) bug

data.ts

import { dbPool } from "./webserver.ts";

export function d() {
  dbPool;
}

page1.ts

import { d } from "./data.ts";

export default async function fn() {
  d();
}

page2.ts

import { d } from "./data.ts";

export default async function fn() {
  d();
}

router.ts

import page1 from "./page1.ts";
import page2 from "./page2.ts";

export default function router() {
  page1();
  page2();
}

webserver.ts

// run `deno bundle webserver.ts`

import router from "./router.ts";

export const dbPool = 1;

router();