feat(algoliasearch): add support for algoliasearch v4

.circleci/config.yml

@@ -67,7 +67,12 @@ jobs:
       - save_cache: *save_yarn_cache
       - run:
           name: Install algoliasearch v3
-          command: yarn add -D -W "algoliasearch@3.35.1"
+          command: |
+            yarn remove -W @algolia/client-search
+            yarn add -W @types/algoliasearch@3.34.8 algoliasearch@3.35.1
+      - run:
+          name: Type checking
+          command: yarn type-check
       - run:
           name: Unit Tests
           command: yarn test --maxWorkers=4

package.json

@@ -32,6 +32,7 @@
     "website:build": "yarn build && yarn webpack --config website/webpack.config.js"
   },
   "devDependencies": {
+    "@algolia/client-search": "4.0.0-beta.14",
     "@babel/cli": "7.4.4",
     "@babel/core": "7.4.5",
     "@babel/plugin-proposal-class-properties": "7.4.4",

packages/react-instantsearch-core/src/widgets/InstantSearch.tsx

@@ -5,7 +5,26 @@ import createInstantSearchManager from '../core/createInstantSearchManager';
 import { InstantSearchProvider, InstantSearchContext } from '../core/context';
 import { Store } from '../core/createStore';
 import { PlainSearchParameters, SearchParameters } from 'algoliasearch-helper';
-import { SearchResponse } from '@algolia/client-search';
+
+import algoliasearch, {
+  // @ts-ignore
+  Response as SearchResponseV3,
+} from 'algoliasearch';
+import {
+  SearchResponse as SearchResponseV4,
+  // @ts-ignore
+  // eslint-disable-next-line import/no-unresolved
+} from '@algolia/client-search';
+
+type DummySearchClientV4 = {
+  readonly addAlgoliaAgent: (segment: string, version?: string) => void;
+};
+
+type SearchResponse<THit> = ReturnType<
+  typeof algoliasearch
+> extends DummySearchClientV4
+  ? SearchResponseV4<THit>
+  : SearchResponseV3<THit>;
 
 interface MultiResponse<THit = any> {
   results: Array<SearchResponse<THit>>;