Simplify environment injections (#10175)

* Remove unnecessary injection guard

* Remove inject() indirection for global injections

It was necessary when they shared global state. But now these are flat bundles so we can inject as side effect.
This feels a bit less convoluted to me.

Ideally we can get rid of this somehow soon.

src/renderers/dom/ReactDOMNodeStreamEntry.js

@@ -11,11 +11,10 @@
 
 'use strict';
 
-var ReactDOMInjection = require('ReactDOMInjection');
 var ReactDOMNodeStreamRenderer = require('ReactDOMNodeStreamRenderer');
 var ReactVersion = require('ReactVersion');
 
-ReactDOMInjection.inject();
+require('ReactDOMInjection');
 
 module.exports = {
   renderToStream: ReactDOMNodeStreamRenderer.renderToStream,

src/renderers/dom/ReactDOMServerEntry.js

@@ -11,11 +11,10 @@
 
 'use strict';
 
-var ReactDOMInjection = require('ReactDOMInjection');
 var ReactDOMStringRenderer = require('ReactDOMStringRenderer');
 var ReactVersion = require('ReactVersion');
 
-ReactDOMInjection.inject();
+require('ReactDOMInjection');
 
 module.exports = {
   renderToString: ReactDOMStringRenderer.renderToString,

src/renderers/dom/ReactDOMServerStackEntry.js

@@ -11,13 +11,11 @@
 
 'use strict';
 
-var ReactDOMInjection = require('ReactDOMInjection');
-var ReactDOMStackInjection = require('ReactDOMStackInjection');
 var ReactServerRendering = require('ReactServerRendering');
 var ReactVersion = require('ReactVersion');
 
-ReactDOMInjection.inject();
-ReactDOMStackInjection.inject();
+require('ReactDOMInjection');
+require('ReactDOMStackInjection');
 
 var ReactDOMServerStack = {
   renderToString: ReactServerRendering.renderToString,

src/renderers/dom/ReactDOMStackEntry.js

@@ -14,9 +14,6 @@
 'use strict';
 
 var ReactDOMComponentTree = require('ReactDOMComponentTree');
-var ReactDOMInjection = require('ReactDOMInjection');
-var ReactDOMClientInjection = require('ReactDOMClientInjection');
-var ReactDOMStackInjection = require('ReactDOMStackInjection');
 var ReactGenericBatching = require('ReactGenericBatching');
 var ReactMount = require('ReactMount');
 var ReactUpdates = require('ReactUpdates');
@@ -27,9 +24,9 @@ var findDOMNode = require('findDOMNode');
 var getHostComponentFromComposite = require('getHostComponentFromComposite');
 var warning = require('fbjs/lib/warning');
 
-ReactDOMInjection.inject();
-ReactDOMClientInjection.inject();
-ReactDOMStackInjection.inject();
+require('ReactDOMInjection');
+require('ReactDOMClientInjection');
+require('ReactDOMStackInjection');
 
 var ReactDOMStack = {
   findDOMNode: findDOMNode,

src/renderers/dom/fiber/ReactDOMFiberEntry.js

@@ -22,8 +22,6 @@ var ReactFeatureFlags = require('ReactFeatureFlags');
 var ReactDOMFeatureFlags = require('ReactDOMFeatureFlags');
 var ReactDOMFiberComponent = require('ReactDOMFiberComponent');
 var ReactDOMFrameScheduling = require('ReactDOMFrameScheduling');
-var ReactDOMClientInjection = require('ReactDOMClientInjection');
-var ReactDOMInjection = require('ReactDOMInjection');
 var ReactGenericBatching = require('ReactGenericBatching');
 var ReactFiberReconciler = require('ReactFiberReconciler');
 var ReactInputSelection = require('ReactInputSelection');
@@ -65,8 +63,8 @@ if (__DEV__) {
   var {updatedAncestorInfo} = validateDOMNesting;
 }
 
-ReactDOMClientInjection.inject();
-ReactDOMInjection.inject();
+require('ReactDOMClientInjection');
+require('ReactDOMInjection');
 ReactControlledComponent.injection.injectFiberControlledHostComponent(
   ReactDOMFiberComponent,
 );

src/renderers/dom/shared/ReactDOMClientInjection.js

@@ -23,40 +23,24 @@ var ReactDOMEventListener = require('ReactDOMEventListener');
 var SelectEventPlugin = require('SelectEventPlugin');
 var SimpleEventPlugin = require('SimpleEventPlugin');
 
-var alreadyInjected = false;
+ReactDOMEventListener.setHandleTopLevel(
+  ReactBrowserEventEmitter.handleTopLevel,
+);
 
-function inject() {
-  if (alreadyInjected) {
-    // TODO: This is currently true because these injections are shared between
-    // the client and the server package. They should be built independently
-    // and not share any injection state. Then this problem will be solved.
-    return;
-  }
-  alreadyInjected = true;
-
-  ReactDOMEventListener.setHandleTopLevel(
-    ReactBrowserEventEmitter.handleTopLevel,
-  );
-
-  /**
-   * Inject modules for resolving DOM hierarchy and plugin ordering.
-   */
-  EventPluginHub.injection.injectEventPluginOrder(DOMEventPluginOrder);
-  EventPluginUtils.injection.injectComponentTree(ReactDOMComponentTree);
-
-  /**
-   * Some important event plugins included by default (without having to require
-   * them).
-   */
-  EventPluginHub.injection.injectEventPluginsByName({
-    SimpleEventPlugin: SimpleEventPlugin,
-    EnterLeaveEventPlugin: EnterLeaveEventPlugin,
-    ChangeEventPlugin: ChangeEventPlugin,
-    SelectEventPlugin: SelectEventPlugin,
-    BeforeInputEventPlugin: BeforeInputEventPlugin,
-  });
-}
+/**
+ * Inject modules for resolving DOM hierarchy and plugin ordering.
+ */
+EventPluginHub.injection.injectEventPluginOrder(DOMEventPluginOrder);
+EventPluginUtils.injection.injectComponentTree(ReactDOMComponentTree);
 
-module.exports = {
-  inject: inject,
-};
+/**
+ * Some important event plugins included by default (without having to require
+ * them).
+ */
+EventPluginHub.injection.injectEventPluginsByName({
+  SimpleEventPlugin: SimpleEventPlugin,
+  EnterLeaveEventPlugin: EnterLeaveEventPlugin,
+  ChangeEventPlugin: ChangeEventPlugin,
+  SelectEventPlugin: SelectEventPlugin,
+  BeforeInputEventPlugin: BeforeInputEventPlugin,
+});

src/renderers/dom/shared/ReactDOMInjection.js

@@ -16,22 +16,6 @@ var DOMProperty = require('DOMProperty');
 var HTMLDOMPropertyConfig = require('HTMLDOMPropertyConfig');
 var SVGDOMPropertyConfig = require('SVGDOMPropertyConfig');
 
-var alreadyInjected = false;
-
-function inject() {
-  if (alreadyInjected) {
-    // TODO: This is currently true because these injections are shared between
-    // the client and the server package. They should be built independently
-    // and not share any injection state. Then this problem will be solved.
-    return;
-  }
-  alreadyInjected = true;
-
-  DOMProperty.injection.injectDOMPropertyConfig(ARIADOMPropertyConfig);
-  DOMProperty.injection.injectDOMPropertyConfig(HTMLDOMPropertyConfig);
-  DOMProperty.injection.injectDOMPropertyConfig(SVGDOMPropertyConfig);
-}
-
-module.exports = {
-  inject: inject,
-};
+DOMProperty.injection.injectDOMPropertyConfig(ARIADOMPropertyConfig);
+DOMProperty.injection.injectDOMPropertyConfig(HTMLDOMPropertyConfig);
+DOMProperty.injection.injectDOMPropertyConfig(SVGDOMPropertyConfig);

src/renderers/dom/shared/__tests__/DOMPropertyOperations-test.js

@@ -18,8 +18,7 @@ describe('DOMPropertyOperations', () => {
 
   beforeEach(() => {
     jest.resetModules();
-    var ReactDOMInjection = require('ReactDOMInjection');
-    ReactDOMInjection.inject();
+    require('ReactDOMInjection');
 
     // TODO: can we express this test with only public API?
     DOMPropertyOperations = require('DOMPropertyOperations');

src/renderers/dom/stack/client/ReactDOMStackInjection.js

@@ -27,44 +27,28 @@ var ReactUpdates = require('ReactUpdates');
 var findDOMNode = require('findDOMNode');
 var getHostComponentFromComposite = require('getHostComponentFromComposite');
 
-var alreadyInjected = false;
+ReactGenericBatching.injection.injectStackBatchedUpdates(
+  ReactUpdates.batchedUpdates,
+);
 
-function inject() {
-  if (alreadyInjected) {
-    // TODO: This is currently true because these injections are shared between
-    // the client and the server package. They should be built independently
-    // and not share any injection state. Then this problem will be solved.
-    return;
-  }
-  alreadyInjected = true;
+ReactHostComponent.injection.injectGenericComponentClass(ReactDOMComponent);
 
-  ReactGenericBatching.injection.injectStackBatchedUpdates(
-    ReactUpdates.batchedUpdates,
-  );
+ReactHostComponent.injection.injectTextComponentClass(ReactDOMTextComponent);
 
-  ReactHostComponent.injection.injectGenericComponentClass(ReactDOMComponent);
+ReactEmptyComponent.injection.injectEmptyComponentFactory(function(
+  instantiate,
+) {
+  return new ReactDOMEmptyComponent(instantiate);
+});
 
-  ReactHostComponent.injection.injectTextComponentClass(ReactDOMTextComponent);
+ReactUpdates.injection.injectReconcileTransaction(ReactReconcileTransaction);
+ReactUpdates.injection.injectBatchingStrategy(ReactDefaultBatchingStrategy);
 
-  ReactEmptyComponent.injection.injectEmptyComponentFactory(function(
-    instantiate,
-  ) {
-    return new ReactDOMEmptyComponent(instantiate);
-  });
+ReactComponentEnvironment.injection.injectEnvironment(
+  ReactComponentBrowserEnvironment,
+);
 
-  ReactUpdates.injection.injectReconcileTransaction(ReactReconcileTransaction);
-  ReactUpdates.injection.injectBatchingStrategy(ReactDefaultBatchingStrategy);
-
-  ReactComponentEnvironment.injection.injectEnvironment(
-    ReactComponentBrowserEnvironment,
-  );
-
-  findDOMNode._injectStack(function(inst) {
-    inst = getHostComponentFromComposite(inst);
-    return inst ? ReactDOMComponentTree.getNodeFromInstance(inst) : null;
-  });
-}
-
-module.exports = {
-  inject: inject,
-};
+findDOMNode._injectStack(function(inst) {
+  inst = getHostComponentFromComposite(inst);
+  return inst ? ReactDOMComponentTree.getNodeFromInstance(inst) : null;
+});

src/renderers/native/ReactNativeFiberEntry.js

@@ -15,7 +15,6 @@
 const ReactFiberErrorLogger = require('ReactFiberErrorLogger');
 const ReactGenericBatching = require('ReactGenericBatching');
 const ReactNativeFiberErrorDialog = require('ReactNativeFiberErrorDialog');
-const ReactNativeInjection = require('ReactNativeInjection');
 const ReactPortal = require('ReactPortal');
 const ReactNativeComponentTree = require('ReactNativeComponentTree');
 const ReactNativeFiberRenderer = require('ReactNativeFiberRenderer');
@@ -30,7 +29,7 @@ const {injectInternals} = require('ReactFiberDevToolsHook');
 import type {ReactNativeType} from 'ReactNativeTypes';
 import type {ReactNodeList} from 'ReactTypes';
 
-ReactNativeInjection.inject();
+require('ReactNativeInjection');
 
 ReactGenericBatching.injection.injectFiberBatchedUpdates(
   ReactNativeFiberRenderer.batchedUpdates,

src/renderers/native/ReactNativeInjection.js

@@ -29,32 +29,26 @@ var ReactNativeEventPluginOrder = require('ReactNativeEventPluginOrder');
 var ReactNativeGlobalResponderHandler = require('ReactNativeGlobalResponderHandler');
 var ResponderEventPlugin = require('ResponderEventPlugin');
 
-function inject() {
-  /**
-   * Register the event emitter with the native bridge
-   */
-  RCTEventEmitter.register(ReactNativeEventEmitter);
-
-  /**
-   * Inject module for resolving DOM hierarchy and plugin ordering.
-   */
-  EventPluginHub.injection.injectEventPluginOrder(ReactNativeEventPluginOrder);
-  EventPluginUtils.injection.injectComponentTree(ReactNativeComponentTree);
+/**
+ * Register the event emitter with the native bridge
+ */
+RCTEventEmitter.register(ReactNativeEventEmitter);
 
-  ResponderEventPlugin.injection.injectGlobalResponderHandler(
-    ReactNativeGlobalResponderHandler,
-  );
+/**
+ * Inject module for resolving DOM hierarchy and plugin ordering.
+ */
+EventPluginHub.injection.injectEventPluginOrder(ReactNativeEventPluginOrder);
+EventPluginUtils.injection.injectComponentTree(ReactNativeComponentTree);
 
-  /**
-   * Some important event plugins included by default (without having to require
-   * them).
-   */
-  EventPluginHub.injection.injectEventPluginsByName({
-    ResponderEventPlugin: ResponderEventPlugin,
-    ReactNativeBridgeEventPlugin: ReactNativeBridgeEventPlugin,
-  });
-}
+ResponderEventPlugin.injection.injectGlobalResponderHandler(
+  ReactNativeGlobalResponderHandler,
+);
 
-module.exports = {
-  inject: inject,
-};
+/**
+ * Some important event plugins included by default (without having to require
+ * them).
+ */
+EventPluginHub.injection.injectEventPluginsByName({
+  ResponderEventPlugin: ResponderEventPlugin,
+  ReactNativeBridgeEventPlugin: ReactNativeBridgeEventPlugin,
+});

src/renderers/native/ReactNativeStackEntry.js

@@ -12,18 +12,16 @@
 'use strict';
 
 var ReactNativeComponentTree = require('ReactNativeComponentTree');
-var ReactNativeInjection = require('ReactNativeInjection');
 var ReactNativeMount = require('ReactNativeMount');
-var ReactNativeStackInjection = require('ReactNativeStackInjection');
 var ReactUpdates = require('ReactUpdates');
 var ReactNativeStackInspector = require('ReactNativeStackInspector');
 
 var findNumericNodeHandle = require('findNumericNodeHandleStack');
 
 import type {ReactNativeType} from 'ReactNativeTypes';
 
-ReactNativeInjection.inject();
-ReactNativeStackInjection.inject();
+require('ReactNativeInjection');
+require('ReactNativeStackInjection');
 
 var render = function(
   element: ReactElement<any>,