Must use import to load ES Module (using ky/ky-universal library)

[matveychuk]

What version of Next.js are you using?

10.0.5

What version of Node.js are you using?

14.15.4

What browser are you using?

Chrome

What operating system are you using?

macOS

How are you deploying your application?

localhost

Describe the Bug

When trying to use ky/ky-universal with the newly created Next.js app receive such error:
Error: Must use import to load ES Module: /Users/---/node_modules/ky-universal/index.js
require() of ES modules is not supported.
require() of /---/node_modules/ky-universal/index.js from /---/.next/server/pages/index.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename /---/node_modules/ky-universal/index.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from /---/node_modules/ky-universal/package.json.

Packages version:
Node 14.15.4,
"dependencies": {
"ky": "^0.26.0",
"ky-universal": "^0.9.1",
"next": "10.0.5",
"react": "17.0.1",
"react-dom": "17.0.1"
}

Code extract

import ky from "ky-universal";

export default function Home() {
  const fetchData = async () => {
    const res = await ky
      .get("https://jsonplaceholder.typicode.com/todos/1")
      .json();
    setData(res);
    console.log(res);
  };

Maintainers of ky state that "This package(ky/ky-universal) is correctly set up for ESM, so Next.js is doing something wrong."

Expected Behavior

Possibility to fetch data with ky library

To Reproduce

Create new Next.js app, add ky and ky-universal and try to do any HTTP request.

[oldo]

Also experiencing the same issue
#21252

[reducio]

Yes, I have same problem with ky/ky-universal packages.

[reducio]

Yes, I have same problem with ky/ky-universal packages.

#21252 (reply in thread)

[saltyshiomix]

This is a Next.js side problem.
(I sent the same issue here.)

In the meantime, we can use ky@0.25.1 and ky-universal@0.8.2 which should fix the errors.

Related: sindresorhus/ky#336