fractional-indexing and Jest

README.md

node --version # v17.9.0
npm --version # 8.5.5
npm install
npm run test

package.json

{
  "name": "frac-index-jest",
  "type": "module",
  "scripts": {
    "test": "NODE_OPTIONS=--experimental-vm-modules jest"
  },
  "dependencies": {
    "fractional-indexing": "^3.0.0",
    "jest": "^27.5.1"
  }
}

test.test.js

import { generateKeyBetween } from 'fractional-indexing';
import { expect, test } from '@jest/globals';

test('x', () => {
  expect(generateKeyBetween(null, null)).toEqual('a0');
});