# useObservable \[Bind a raw Observable to React] Binds any plain `Observable` to React, re-rendering on each new emission. Equal consecutive emissions are skipped (`lodash.isEqual`), so a source that re-emits an equal value won't re-render. Use it for raw streams; for async status prefer [`usePending`](/react/use-pending), and for two-way `IAtom` binding prefer [`useAtom`](/react/use-atom). ```ts function useObservable(observable: Observable, initialValue: T): T; function useObservable(observable: Observable): T | undefined; ```