10$: warn on unsupported JSX HTML entities (e.g. ;)
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strager commented
For JSX HTML entities (& for example), transpilers seem to support HTML4 named entities but not HTML5 named entities.
JSX spec: https://facebook.github.io/jsx/#prod-JSXStringCharacter
HTML4 named entities: https://www.w3.org/TR/1999/REC-html401-19991224/sgml/entities.html
HTML5 named entities: https://html.spec.whatwg.org/multipage/named-characters.html#named-character-references