The ts-mocha test does not play well with the use of node-fetch library

I have set up ts-mocha and node-fetch to run a unit test, but I am encountering the following error:

TypeError: Unknown file extension ".ts" for ...

The content of the file is as follows:

import fetch from 'node-fetch';

export default async () => {
  return fetch('https://github.com/');
}

Here is my unit test:

import { expect } from 'chai'; 
import useFetch from './useFetch';

describe("useFetch", function() {
  before(async () => {
    await import ('./useFetch');
  });

  describe("get", async () => {
    it("test", async () => {
      const result = await useFetch();

      expect(result).to.equal('fail');
    });
  });
});

The function is being executed, and when I remove the fetch call, the error disappears. How can I resolve this issue?

Answer №1

Remove the async keyword from the describe function.

import { expect } from 'chai'; 
import useFetch from './useFetch';

describe("useFetch", function() {
  before(async () => {
    await import ('./useFetch');
  });

  // omit async in describe
  describe("get", () => {
    it("test", async () => {
      const result = await useFetch();

      expect(result).to.equal('fail');
    });
  });
});

Unfortunately, I was unable to test this solution, but you can find more information at this link.

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