react-instantsearch/packages/react-instantsearch-hooks/src/lib/useInstantSearchContext.ts

import { useContext } from 'react';

import { invariant } from '../lib/invariant';

import { InstantSearchContext } from './InstantSearchContext';

import type { InstantSearch, UiState } from 'instantsearch.js';
import type { Context } from 'react';

export function useInstantSearchContext<
  TUiState extends UiState,
  TRouteState = TUiState
>() {
  const search = useContext(
    InstantSearchContext as Context<InstantSearch<TUiState, TRouteState> | null>
  );

  invariant(
    search !== null,
    'Hooks must be used inside the <InstantSearch> component.\n\n' +
      'They are not compatible with the `react-instantsearch-core` and `react-instantsearch-dom` packages, so make sure to use the <InstantSearch> component from `react-instantsearch-hooks`.'
  );

  return search;
}