const { Parser } = require('acorn')
const JSXParser = Parser.extend(require('acorn-jsx')())

const isReactComponent = Boolean(
  JSON.stringify(
    JSXParser.parse(fileContent, {
      sourceType: 'module',
      ecmaVersion: 'latest',
    })
  ).includes('JSXIdentifier')
)

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• https://github.com/vitejs/vite/discussions/3448
• https://github.com/jyash97/cra-to-vite/blob/master/src/index.js#L40-L43