1. React Must Be in Scope
Let’s assume we are creating “helloWorld.jsx” like below, you can see there is a compilation error display as “’React’ must be in scope when using JSX react/react-in-jsx-scope.”
const element = <h1>Hello World!</h1> export default element;
This happens due to “React” import necessary in JSX file.The React library must also always be in scope from JSX code. To overcome this error “import React from “react”;” must be added into the file as follows.
A preview feature or VM feature is a new feature of the Java SE Platform.
This article shows you how to use –enable-preview to enable the preview features in Java 13 with maven.
To use preview features in your programs, you must explicitly enable them in the compiler and the runtime system. Because this feature disabled by default.If not, you’ll receive an error message that states that your code is using a preview feature.