Source code is written as:

export async function run() {
  const myLib = await import("some-lib");
}

run();

However output for CJS is:

//#region src/index.ts
async function run() {
  await import("some-lib");
}
run();

//#endregion
exports.run = run;

I would expect the dynamic import to be rewritten as a dynamic require:

//#region src/index.ts
async function run() {
  require("some-lib");
}
run();

//#endregion
exports.run = run;

I was able to work around it in a hacky way by adding a plugin, but this doesn't feel like the way to resolve this.

plugins: [
  {
    name: "import-require",
    transform: (code) => {
      return code.replaceAll(" await import(", " require(");
    },
  },
];

The dist folder is included. But you can run yarn install (optionally corepack enable) and then yarn tsdown