Chessjs cannot be imported without using es6 syntax

Question

In all of the chessjs documentation, const chess = require('chess'); is used.

However, when I try to use this syntax, I get this error:

const Chess = require('chess');
              ^

Error [ERR_REQUIRE_ESM]: require() of ES Module is not supported.
Instead change the require of main.js to a dynamic import() which is available in all CommonJS modules.
    at Object.<anonymous> {
  code: 'ERR_REQUIRE_ESM'
}

Is there a solution for this?

You may follow the steps defined here for the solution: gist.github.com/sindresorhus/… — kavigun
– kavigun, Commented Sep 20, 2022 at 5:47
@kavigun the problem is that I cannot migrate the entire project to ESM. I require some modules depending on an if statement in the middle of my index file, which you can't do with esm because imports have to be top-level only. — divinelemon
– divinelemon, Commented Sep 20, 2022 at 6:21
That is also the syntax you need if you want to import a ESM module in a CJS file — Evert
– Evert, Commented Sep 20, 2022 at 6:57

Matt · Accepted Answer · 2022-09-20 09:50:19Z

1

The dynamic import() looks like this

async function loader(){
  const Chess = await import('chess')
  // things with Chess
}

As Evert mentioned, this can also cover the conditional import in an ESModule

answered Sep 20, 2022 at 9:50

Matt

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1 Comment

divinelemon Over a year ago

I never knew this existed in common js. Thank you!

divinelemon · Accepted Answer · 2022-09-20 19:13:16Z

0

Although this isn't the solution to the general question (which is why I'm not marking this as the solution), I ended up just migrating away from the module chess which doesn't allow commonjs requires to the module chess.js which allows both.

New code:

const { Chess }= require('chess.js');

answered Sep 20, 2022 at 19:13

divinelemon

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