tsconfig.manager.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    // Classic JSX for manager code only.
    //
    // Storybook's manager builder maps the bare `react` specifier to
    // `globalThis.__REACT__` — Storybook's own React 18 — but it does NOT map
    // `react/jsx-runtime`. With the automatic runtime, an addon's manager bundle
    // therefore ships the *consumer's* jsx-runtime (React 19 for most projects)
    // while `React` itself is Storybook's React 18. React 19's jsx-runtime reads
    // `React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE`,
    // which React 18 does not have, and crashes with
    // `Cannot read properties of undefined (reading 'recentlyCreatedOwnerStacks')`.
    //
    // The classic transform emits `React.createElement`, which resolves through
    // the globalized `react` specifier, so only one React copy is ever involved.
    "jsx": "react"
  },
  "include": ["src/**/*"]
}