Monthly Archive: January 2021

WARNING (@babel/preset-env): We noticed you're using the `useBuiltIns` option without declaring a core-js version. Currently, we assume version 2.x when no version is passed. Since this default version will likely change in future versions...

A warning/error printed in the console jest-dom has moved to @testing-library/jest-dom. Please uninstall jest-dom and install @testing-library/jest-dom instead, or use an older version of jest-dom. If you do upgrade to @testing-library/jest-dom, make sure to...

  // Take screenshot with generateImage()   const screenshot = await generateImage();   // and compare it to the previous sceenshot with toMatchImageSnapshot()   expect(screenshot).toMatchImageSnapshot(); toMatchImageSnapshot is not existing naturally on expect object. You need to manually extend with this code:

From : https://stackoverflow.com/questions/58603209/react-hooks-render-twice It's an intentional feature of the StrictMode. This only happens in development, and helps find accidental side effects put into the render phase. We only do this for components with Hooks...

Cannot log after tests are done. Did you forget to wait for something async in your test? useEffect(() => { console.log("client register", uniqueIdFormInput); formAggregatorRef.current.register(uniqueIdFormInput); return () => { console.log('cleanup unregister'); formAggregatorRef.current.unregister(uniqueIdFormInput); }; }, []);...

console.warn react-i18next:: You will need pass in an i18next instance by using initReactI18next Solution jest.mock('react-i18next', () => ({ // this mock makes sure any components using the translate hook can use it without a...

Expected ref to be a function, a string, an object returned by React.createRef(), or null. Code test('MultipleFormAggregator to prevent an invalid form submit two times in a row', () => {   const formAggregatorRef = useRef<MultipleFormAggregatorRef>(null);   const component = renderer.create(     <div>       <MultipleFormAggregator ref={formAggregatorRef} />     </div>,   );  (...) }); Solution Create a jig, dont use ref in your...

Solution Add "@babel/typescript" to your project as well as in the babel.config.js file : module.exports = {   presets: [     '@babel/preset-env',     '@babel/preset-react',     "@babel/typescript",   ],   plugins: [     "@babel/plugin-proposal-export-default-from",   ], };

SyntaxError: C:\dev\mx4d-ui\src\js\component\multiple-form-aggregator.tsx: Support for the experimental syntax 'exportDefaultFrom' isn't currently enabled (5:8): 3 | import { log } from 'src/js/service/logger'; 4 | > 5 | export interface FormAggregatorClientInterface { Solution Install npm package @babel/plugin-proposal-export-default-from $...