React

ReactReact (also known as React.js or ReactJS) is a JavaScript li... More (also known as ReactReact (also known as React.js or ReactJS) is a JavaScript li... More.js or ReactJS) is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies. It is also the basis of GutenbergGutenberg is newly developed, block-oriented editor, written... More, the new WordPress editor.

Because ReactReact (also known as React.js or ReactJS) is a JavaScript li... More is written in JavaScript, and themes written to use the Classic Editor use PHP, themes using the Classic Editor cannot automatically migrate to GutenbergGutenberg is newly developed, block-oriented editor, written... More. They must be tested or rewritten to be fully compatible with the new WordPress editor.