The JSX expression on the right-hand side of the example compiles to a React.createElement () call. We can infer a rule about JSX components from that: The React library always needs to be in scope.

Love it or loathe it, JSX has made a big impact on front-end engineering. Here's a code-first intro to the HTML-based JavaScript templating language.

In response to overwhelming user requests, Microsoft has started a project to add support for a React JavaScript component to Visual Studio 2015. (Note: an earlier version of this article incorrectly ...