> Where is jsx defined, as a language? https://facebook.github.io/jsx/ https://facebook.github.io/jsx/ is the primary home. > are there multiple transpiler im

> Where is jsx defined, as a language? https://facebook.github.io/jsx/ https://facebook.github.io/jsx/ is the primary home. > are there multiple transpiler implementations? Yes. Off the top of my head: Babel: https://babeljs.io/docs/babel-plugin-transform-react-jsx https://babeljs.io/docs/babel-plugin-transform-react-jsx Typescript: https://www.typescriptlang.org/docs/handbook/jsx.html https://www.typescriptlang.org/docs/handbook/jsx.html esbuild: https://esbuild.github.io/content-types/#jsx https://esbuild.github.io/content-types/#jsx > is it standardized at all? In terms of well documented, yes. In terms of a TC-39 standard accepted as a part of JS and intended for browsers to consume? No. Unless you count how much it borrows from E4X [0] which was an optional part of the "lost version" of JS that was EcmaScript 4, then "sort of". [0] https://en.wikipedia.org/wiki/ECMAScript_for_XML https://en.wikipedia.org/wiki/ECMAScript_for_XML