Jest cannot recognize bundled file

[Michael Tsai]

// utils
import memoize from "proxy-memoize";

export const getOptions = memoize((x) => {
  if (!x.Options) {
    return [];
  }

  return x.Options.map((o) => ({
    value: o.Value,
    text: o.Text
  }));
});

// utils.test.js
import { getOptions } from "./utils";

describe("package", () => {
  it("will throw error", () => {
    let options = getOptions({ Options: [{ Value: 1, Text: 2 }] });

    expect(options).toEqual([{ value: 1, text: 2 }]);
  });
});

Jest will show this error

TypeError: (0 , _proxyMemoize.default) is not a function

example codesandbox

[Daishi Kato]

Yeah, I found this error when I use it in valtio.
So far, what I found as a workaround is this.

To be honest, I'm still not sure what is blocking because zustand uses default export too and it should be working fine.

[Michael Tsai]

I'm searching the solution all day and found nothing.
Thanks for the workaround!

[Tom Hicks]

@dai-shi not sure if this helps but I've read that this issue can be caused by circular dependencies. It seems unlikely that there could possibly be circular deps between valtio and this but this came up when I was looking at this problem yesterday: kulshekhar/ts-jest#1873 (comment)

[Daishi Kato]

The issue is ES default export handling. But, circular dependencies might be somehow related. Thanks for the link.

[Sasha Goldberg]

So what is the solution?

[Daishi Kato]

We don't know how to fix it properly on our end.
A workaround is something like this.

[Sasha Goldberg]

Thanks. Will give it a try