Do I need to import React in every file with JSX?
Not with the modern automatic JSX runtime. Newer React setups insert the needed helper functions automatically, so you do not need to import React in every file just to use JSX.
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More FAQs in How JSX Gets Compiled to JavaScript: The React.createElement Story
No. Browsers cannot parse JSX; putting it in a plain script tag causes a syntax error. JSX must be compiled by Babel or a bundler's compiler into regular JavaScript before the browser sees it.
Each JSX element compiles into a React.createElement call, with the element type, a props object, and children as arguments. Nested JSX becomes nested calls producing a tree of objects.
It returns a plain JavaScript object describing the element, including its type, props, and children. This object is React's internal description of a piece of the UI.
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