Rename to withSuspenseConfig and drop the default config

This allow opting out of suspending in some nested scope.

A lot of time when you use this function you'll use it with high level
helpers. Those helpers often want to accept some additional configuration
for suspense and if it should suspend at all. The easiest way is to just
have the api accept null or a suspense config and pass it through. However,
then you have to remember that calling suspendIfNeeded has a default.

It gets simpler by just saying tat you can pass the config. You can have
your own default in user space.

packages/react-reconciler/src/__tests__/ReactSuspenseWithNoopRenderer-test.internal.js

@@ -745,9 +745,12 @@ describe('ReactSuspenseWithNoopRenderer', () => {
     expect(Scheduler).toFlushAndYield(['S']);
 
     // Schedule an update, and suspend for up to 5 seconds.
-    React.unstable_suspendIfNeeded(() => ReactNoop.render(<App text="A" />), {
-      timeoutMs: 5000,
-    });
+    React.unstable_withSuspenseConfig(
+      () => ReactNoop.render(<App text="A" />),
+      {
+        timeoutMs: 5000,
+      },
+    );
     // The update should suspend.
     expect(Scheduler).toFlushAndYield(['Suspend! [A]', 'Loading...']);
     expect(ReactNoop.getChildren()).toEqual([span('S')]);
@@ -759,9 +762,12 @@ describe('ReactSuspenseWithNoopRenderer', () => {
     expect(ReactNoop.getChildren()).toEqual([span('S')]);
 
     // Schedule another low priority update.
-    React.unstable_suspendIfNeeded(() => ReactNoop.render(<App text="B" />), {
-      timeoutMs: 10000,
-    });
+    React.unstable_withSuspenseConfig(
+      () => ReactNoop.render(<App text="B" />),
+      {
+        timeoutMs: 10000,
+      },
+    );
     // This update should also suspend.
     expect(Scheduler).toFlushAndYield(['Suspend! [B]', 'Loading...']);
     expect(ReactNoop.getChildren()).toEqual([span('S')]);
@@ -1665,7 +1671,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {
     ReactNoop.render(<Foo />);
 
     // Took a long time to render. This is to ensure we get a long suspense time.
-    // Could also use something like suspendIfNeeded to simulate this.
+    // Could also use something like withSuspenseConfig to simulate this.
     Scheduler.advanceTime(1500);
     await advanceTimers(1500);
 

packages/react/src/React.js

@@ -40,7 +40,7 @@ import {
   useRef,
   useState,
 } from './ReactHooks';
-import {suspendIfNeeded} from './ReactBatchConfig';
+import {withSuspenseConfig} from './ReactBatchConfig';
 import {
   createElementWithValidation,
   createFactoryWithValidation,
@@ -96,7 +96,7 @@ const React = {
 
   version: ReactVersion,
 
-  unstable_suspendIfNeeded: suspendIfNeeded,
+  unstable_withSuspenseConfig: withSuspenseConfig,
 
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED: ReactSharedInternals,
 };

packages/react/src/ReactBatchConfig.js

@@ -11,16 +11,10 @@ import type {SuspenseConfig} from 'react-reconciler/src/ReactFiberSuspenseConfig
 
 import ReactCurrentBatchConfig from './ReactCurrentBatchConfig';
 
-const DefaultSuspenseConfig: SuspenseConfig = {
-  timeoutMs: 5000,
-  loadingDelayMs: 0,
-  minLoadingDurationMs: 0,
-};
-
 // Within the scope of the callback, mark all updates as being allowed to suspend.
-export function suspendIfNeeded(scope: () => void, config?: SuspenseConfig) {
+export function withSuspenseConfig(scope: () => void, config?: SuspenseConfig) {
   const previousConfig = ReactCurrentBatchConfig.suspense;
-  ReactCurrentBatchConfig.suspense = config || DefaultSuspenseConfig;
+  ReactCurrentBatchConfig.suspense = config === undefined ? null : config;
   try {
     scope();
   } finally {