Using global utility for Jest pattern

env.d.ts

declare global {
   namespace NodeJS {
     interface Global {
        yourUtility(...args: any[]): void;
     }
   }
}

jest.config.js

module.exports = {
  ...jestConfigurations,
  setupFilesAfterEnv: ['<rootDir>/src/setupTest.ts']
};

setupTest.ts

import yourUtility from 'utils/yourUtility';

beforeAll(() => {
   global.yourUtility = yourUtility;
});

yourTest.test.ts

test('your test case here', () => {
   yourUtility(some_args);

   // your actions

   // your assertions
});