TypeError: kitsu_1.default is not a constructor

[benchaikin]

I'm attempting to use Kitsu 10.1.5 with Nest.js on node 22.6.0 with TypeScript 5.7.2.

import Kitsu from 'kitsu';

export class SomeService {
  private readonly api: Kitsu;
  
  constructor {
    this.api = new Kitsu({ baseURL: 'https://some.api.com/v1', pluralize: false });
  }
}

and getting the following error:

TypeError: kitsu_1.default is not a constructor

After some fiddling I was able to get it work with arguably one of the worst hacks of modern history:

import * as Kitsu from 'kitsu';

export class SomeService {
  private readonly api: Kitsu.default;
  
  constructor {
    const hack = Kitsu.default;
    const str = `new Kitsu({baseURL: 'https://some.api.com/v1', pluralize: false})`;
    this.api = eval(str);
  }
}

[wopian]

It looks like it is trying to load the commonJS Kitsu package instead of the ESM Kitsu package.

Legacy CommonJS exports cannot be imported correctly by ESM without using that * syntax as a workaround (not the eval part)

However, you should be able to force it to use the .mjs version if your compiler is refusing to use the correct version of the package (you're using ESM syntax, so it should be loading ESM)

The package is a native ES module package, so I've never encountered this wonky behaviour.