From DOM Testing-library Docs – Appearance and Disappearance Asserting elements are not present The standard getBy methods throw an error when they can’t find an element, so if you want to make an assertion that an element is not present in the DOM, you can use queryBy APIs instead: const submitButton = screen.queryByText(‘submit’) expect(submitButton).toBeNull() // … Read more
There are multiple ways to achieve this. Here, I have explained the two most common approaches. 1. You can use axios interceptors to intercept any requests and add authorization headers. // Add a request interceptor axios.interceptors.request.use(function (config) { const token = store.getState().session.token; config.headers.Authorization = token; return config; }); 2. From the documentation of axios you … Read more
The Component is defined like so: interface Component<P = {}, S = {}> extends ComponentLifecycle<P, S> { } Meaning that the default type for the state (and props) is: {}. If you want your component to have value in the state then you need to define it like this: class App extends React.Component<{}, { value: … Read more
Check if node_modules directory exists. After a fresh clone, there will very likely be no node_modules (since these are .gitignore‘d). Solution run npm install (or yarn) to ensure all deps are downloaded. Alternative Solution If node_modules exists, remove it with rm -rf node_modules and then run npm install (or yarn).
You haven’t started the bundler yet. Run npm start or react-native start in the root directory of your project before react-native run-android.
Export the store from the module you called createStore with. Then you are assured it will both be created and will not pollute the global window space. MyStore.js const store = createStore(myReducer); export store; or const store = createStore(myReducer); export default store; MyClient.js import {store} from ‘./MyStore’ store.dispatch(…) or if you used default import store … Read more
Class Names Firstly, if you’re certain that you’re extending from the correctly named class, e.g. React.Component, not React.component or React.createComponent, you may need to upgrade your React version. See answers below for more information on the classes to extend from. Upgrade React React has only supported ES6-style classes since version 0.13.0 (see their official blog … Read more
create-react-app and react-scripts react-scripts is a set of scripts from the create-react-app starter pack. create-react-app helps you kick off projects without configuring, so you do not have to setup your project by yourself. react-scripts start sets up the development environment and starts a server, as well as hot module reloading. You can read here to … Read more
In this example, nothing really. The exact param comes into play when you have multiple paths that have similar names: For example, imagine we had a Users component that displayed a list of users. We also have a CreateUser component that is used to create users. The url for CreateUsers should be nested under Users. … Read more
If you’re using React Native, you can use the array notation: <View style={[styles.base, styles.background]} /> Check out my detailed blog post about this.