// jsdom has no layout: give the few APIs the editor touches harmless defaults.
if (!('scrollIntoView' in Element.prototype)) (Element.prototype as any).scrollIntoView = () => {}

// This jsdom runs origin-less, so there is no localStorage: provide an
// in-memory one so UI persistence (rail/panel state) behaves like a browser.
if (typeof (globalThis as any).localStorage === 'undefined') {
  const store = new Map<string, string>()
  ;(globalThis as any).localStorage = {
    getItem: (k: string) => (store.has(k) ? store.get(k)! : null),
    setItem: (k: string, v: string) => void store.set(k, String(v)),
    removeItem: (k: string) => void store.delete(k),
    clear: () => store.clear(),
    key: (i: number) => [...store.keys()][i] ?? null,
    get length() {
      return store.size
    },
  }
}
;(globalThis as any).IS_REACT_ACT_ENVIRONMENT = true

// Store updates arrive from fetch/timers outside act(); the harness settles them explicitly.
const error = console.error
console.error = (...a: unknown[]) => {
  if (typeof a[0] === 'string' && a[0].includes('not wrapped in act')) return
  error(...a)
}