zustand part 3 (#2878)

* zustand part 3

* clean up

* yarn lock

src/AppState.tsx

@@ -0,0 +1,45 @@
+import { createContext, useContext, useState, ReactNode } from 'react'
+
+/*
+
+This is for a very small handful of global state we need that doesn't fit into
+any of the Xstate machines.
+Please do not fill this up with junk.
+
+*/
+
+interface AppState {
+  isStreamReady: boolean
+  htmlRef: React.RefObject<HTMLDivElement> | null
+  setAppState: (newAppState: Partial<AppState>) => void
+}
+
+const AppStateContext = createContext<AppState>({
+  htmlRef: null,
+  isStreamReady: false,
+  setAppState: () => {},
+})
+
+export const useAppState = () => useContext(AppStateContext)
+
+export const AppStateProvider = ({ children }: { children: ReactNode }) => {
+  const [appState, _setAppState] = useState<AppState>({
+    htmlRef: null,
+    isStreamReady: false,
+    setAppState: () => {},
+  })
+  const setAppState = (newAppState: Partial<AppState>) =>
+    _setAppState({ ...appState, ...newAppState })
+
+  return (
+    <AppStateContext.Provider
+      value={{
+        htmlRef: appState.htmlRef,
+        isStreamReady: appState.isStreamReady,
+        setAppState,
+      }}
+    >
+      {children}
+    </AppStateContext.Provider>
+  )
+}