pokemon.trade/spec/javascript/setup.js

import * as Enzyme from 'enzyme';
import * as Adapter from 'enzyme-adapter-react-16';
Enzyme.configure({ adapter: new Adapter() });
// Cast global to any type so TS compilation doesn't complain about missing
// property
const globalAny = global;
globalAny.shallow = Enzyme.shallow;
globalAny.render = Enzyme.render;
globalAny.mount = Enzyme.mount;