`deno run` not returning

if ("Deno" in window) {
  // Import paper_js, as it is not loaded by the index.html script include
  const paper_import = await import("npm:paper");
  const paper = paper_import.default;
  await import("npm:paper-jsdom");
  globalThis.paper = paper;
  paper.setup();
  console.log("setup paper");
}

console.log("doing");
try {
  await main();
  console.log("done!");
} catch (error) {
  console.error("An error occursed:", error);
} finally {
  // Keep the program running until all asynchronous operations are complete
  await new Promise((resolve) => setTimeout(resolve, 0));
  console.log("now done");
}
console.log("really done");