feat: add useBackgroundQuery and useReadQuery Suspense hooks

.changeset/seven-onions-burn.md

@@ -0,0 +1,5 @@
+---
+'@apollo/client': minor
+---
+
+Feature: adds `useBackgroundQuery` and `useReadQuery` hooks

.prettierignore

@@ -56,8 +56,10 @@ src/react/hooks/*
 !src/react/hooks/internal
 !src/react/hooks/useSuspenseCache.ts
 !src/react/hooks/useSuspenseQuery.ts
+!src/react/hooks/useBackgroundQuery.ts
 
 ## Allowed React hook tests
 !src/react/hooks/__tests__/
 src/react/hooks/__tests__/*
 !src/react/hooks/__tests__/useSuspenseQuery.test.tsx
+!src/react/hooks/__tests__/useBackgroundQuery.test.tsx

config/bundlesize.ts

@@ -3,7 +3,7 @@ import { join } from "path";
 import { gzipSync } from "zlib";
 import bytes from "bytes";
 
-const gzipBundleByteLengthLimit = bytes("35.10KB");
+const gzipBundleByteLengthLimit = bytes("35.25KB");
 const minFile = join("dist", "apollo-client.min.cjs");
 const minPath = join(__dirname, "..", minFile);
 const gzipByteLen = gzipSync(readFileSync(minPath)).byteLength;

config/jest.config.js

@@ -29,7 +29,8 @@ const react17TestFileIgnoreList = [
   ignoreTSFiles,
   // For now, we only support useSuspenseQuery with React 18, so no need to test
   // it with React 17
-  'src/react/hooks/__tests__/useSuspenseQuery.test.tsx'
+  'src/react/hooks/__tests__/useSuspenseQuery.test.tsx',
+  'src/react/hooks/__tests__/useBackgroundQuery.test.tsx'
 ]
 
 const tsStandardConfig = {

src/__tests__/__snapshots__/exports.ts.snap

@@ -55,11 +55,13 @@ Array [
   "throwServerError",
   "toPromise",
   "useApolloClient",
+  "useBackgroundQuery_experimental",
   "useFragment_experimental",
   "useLazyQuery",
   "useMutation",
   "useQuery",
   "useReactiveVar",
+  "useReadQuery_experimental",
   "useSubscription",
   "useSuspenseQuery_experimental",
 ]
@@ -252,11 +254,13 @@ Array [
   "parser",
   "resetApolloContext",
   "useApolloClient",
+  "useBackgroundQuery_experimental",
   "useFragment_experimental",
   "useLazyQuery",
   "useMutation",
   "useQuery",
   "useReactiveVar",
+  "useReadQuery_experimental",
   "useSubscription",
   "useSuspenseQuery_experimental",
 ]
@@ -292,11 +296,13 @@ Array [
 exports[`exports of public entry points @apollo/client/react/hooks 1`] = `
 Array [
   "useApolloClient",
+  "useBackgroundQuery_experimental",
   "useFragment_experimental",
   "useLazyQuery",
   "useMutation",
   "useQuery",
   "useReactiveVar",
+  "useReadQuery_experimental",
   "useSubscription",
   "useSuspenseQuery_experimental",
 ]

src/react/cache/QuerySubscription.ts → src/react/cache/QueryReference.ts

@@ -20,15 +20,16 @@ type FetchMoreOptions<TData> = Parameters<
   ObservableQuery<TData>['fetchMore']
 >[0];
 
-interface QuerySubscriptionOptions {
+interface QueryReferenceOptions {
   onDispose?: () => void;
   autoDisposeTimeoutMs?: number;
 }
 
-export class QuerySubscription<TData = unknown> {
+export class QueryReference<TData = unknown> {
   public result: ApolloQueryResult<TData>;
   public readonly observable: ObservableQuery<TData>;
 
+  public version: 'main' | 'network' = 'main';
   public promises: {
     main: Promise<ApolloQueryResult<TData>>;
     network?: Promise<ApolloQueryResult<TData>>;
@@ -45,7 +46,7 @@ export class QuerySubscription<TData = unknown> {
 
   constructor(
     observable: ObservableQuery<TData>,
-    options: QuerySubscriptionOptions = Object.create(null)
+    options: QueryReferenceOptions = Object.create(null)
   ) {
     this.listen = this.listen.bind(this);
     this.handleNext = this.handleNext.bind(this);
@@ -83,7 +84,7 @@ export class QuerySubscription<TData = unknown> {
     }
 
     // Start a timer that will automatically dispose of the query if the
-    // suspended resource does not use this subscription in the given time. This
+    // suspended resource does not use this queryRef in the given time. This
     // helps prevent memory leaks when a component has unmounted before the
     // query has finished loading.
     this.autoDisposeTimeoutId = setTimeout(

src/react/cache/SuspenseCache.ts

@@ -1,7 +1,7 @@
 import { Trie } from '@wry/trie';
 import type { ObservableQuery } from '../../core';
 import { canUseWeakMap } from '../../utilities';
-import { QuerySubscription } from './QuerySubscription';
+import { QueryReference } from './QueryReference';
 
 type CacheKey = any[];
 
@@ -25,29 +25,29 @@ export class SuspenseCache {
     (cacheKey: CacheKey) => cacheKey
   );
 
-  private subscriptions = new Map<CacheKey, QuerySubscription>();
+  private queryRefs = new Map<CacheKey, QueryReference>();
   private options: SuspenseCacheOptions;
 
   constructor(options: SuspenseCacheOptions = Object.create(null)) {
     this.options = options;
   }
 
-  getSubscription<TData = any>(
+  getQueryRef<TData = any>(
     cacheKey: CacheKey,
     createObservable: () => ObservableQuery<TData>
   ) {
     const stableCacheKey = this.cacheKeys.lookupArray(cacheKey);
 
-    if (!this.subscriptions.has(stableCacheKey)) {
-      this.subscriptions.set(
+    if (!this.queryRefs.has(stableCacheKey)) {
+      this.queryRefs.set(
         stableCacheKey,
-        new QuerySubscription(createObservable(), {
+        new QueryReference(createObservable(), {
           autoDisposeTimeoutMs: this.options.autoDisposeTimeoutMs,
-          onDispose: () => this.subscriptions.delete(stableCacheKey),
+          onDispose: () => this.queryRefs.delete(stableCacheKey),
         })
       );
     }
 
-    return this.subscriptions.get(stableCacheKey)! as QuerySubscription<TData>;
+    return this.queryRefs.get(stableCacheKey)! as QueryReference<TData>;
   }
 }