diff --git a/package.json b/package.json
index 939375b0a02fa..78e89495da128 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,6 @@
     "eslint-plugin-no-for-of-loops": "^1.0.0",
     "eslint-plugin-react": "^6.7.1",
     "eslint-plugin-react-internal": "link:./scripts/eslint-rules/",
-    "fbjs": "^0.8.16",
     "fbjs-scripts": "^0.6.0",
     "filesize": "^3.5.6",
     "flow-bin": "^0.72.0",
diff --git a/packages/create-subscription/package.json b/packages/create-subscription/package.json
index a9e306e4b9776..ccfcb5dfe8227 100644
--- a/packages/create-subscription/package.json
+++ b/packages/create-subscription/package.json
@@ -9,9 +9,6 @@
     "index.js",
     "cjs/"
   ],
-  "dependencies": {
-    "fbjs": "^0.8.16"
-  },
   "peerDependencies": {
     "react": "^16.3.0"
   },
diff --git a/packages/create-subscription/src/createSubscription.js b/packages/create-subscription/src/createSubscription.js
index df18f8b3c752b..dec0cc57cefe7 100644
--- a/packages/create-subscription/src/createSubscription.js
+++ b/packages/create-subscription/src/createSubscription.js
@@ -8,8 +8,8 @@
  */
 
 import React from 'react';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 type Unsubscribe = () => void;
 
diff --git a/packages/events/EventPluginHub.js b/packages/events/EventPluginHub.js
index 27840402efe82..a4849d98c9a76 100644
--- a/packages/events/EventPluginHub.js
+++ b/packages/events/EventPluginHub.js
@@ -7,7 +7,7 @@
  */
 
 import ReactErrorUtils from 'shared/ReactErrorUtils';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import {
   injectEventPluginOrder,
diff --git a/packages/events/EventPluginRegistry.js b/packages/events/EventPluginRegistry.js
index efebd984e84fa..77cf4429b8cb9 100644
--- a/packages/events/EventPluginRegistry.js
+++ b/packages/events/EventPluginRegistry.js
@@ -14,7 +14,7 @@ import type {
   PluginModule,
 } from './PluginModuleType';
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 type NamesToPlugins = {[key: PluginName]: PluginModule<AnyNativeEvent>};
 type EventPluginOrder = null | Array<PluginName>;
diff --git a/packages/events/EventPluginUtils.js b/packages/events/EventPluginUtils.js
index 19a89e30de825..28f8c7f89bea7 100644
--- a/packages/events/EventPluginUtils.js
+++ b/packages/events/EventPluginUtils.js
@@ -6,8 +6,8 @@
  */
 
 import ReactErrorUtils from 'shared/ReactErrorUtils';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 export let getFiberCurrentPropsFromNode = null;
 export let getInstanceFromNode = null;
diff --git a/packages/events/EventPropagators.js b/packages/events/EventPropagators.js
index 451d18b852e3d..12acf93606f5e 100644
--- a/packages/events/EventPropagators.js
+++ b/packages/events/EventPropagators.js
@@ -10,7 +10,7 @@ import {
   traverseTwoPhase,
   traverseEnterLeave,
 } from 'shared/ReactTreeTraversal';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 import {getListener} from './EventPluginHub';
 import accumulateInto from './accumulateInto';
diff --git a/packages/events/ReactControlledComponent.js b/packages/events/ReactControlledComponent.js
index 499fb0492791d..378125181f5db 100644
--- a/packages/events/ReactControlledComponent.js
+++ b/packages/events/ReactControlledComponent.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import {
   getInstanceFromNode,
diff --git a/packages/events/ResponderTouchHistoryStore.js b/packages/events/ResponderTouchHistoryStore.js
index 807a5a08d9912..a7bee3acd2698 100644
--- a/packages/events/ResponderTouchHistoryStore.js
+++ b/packages/events/ResponderTouchHistoryStore.js
@@ -7,8 +7,8 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import {isStartish, isMoveish, isEndish} from './ResponderTopLevelEventTypes';
 
diff --git a/packages/events/SyntheticEvent.js b/packages/events/SyntheticEvent.js
index b8693d8d37df7..cdb1382e179f8 100644
--- a/packages/events/SyntheticEvent.js
+++ b/packages/events/SyntheticEvent.js
@@ -7,8 +7,8 @@
 
 /* eslint valid-typeof: 0 */
 
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 let didWarnForAddedNewProperty = false;
 const EVENT_POOL_SIZE = 10;
diff --git a/packages/events/accumulate.js b/packages/events/accumulate.js
index 134e9333a3dca..c59f7abec8371 100644
--- a/packages/events/accumulate.js
+++ b/packages/events/accumulate.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 /**
  * Accumulates items that must not be null or undefined.
diff --git a/packages/events/accumulateInto.js b/packages/events/accumulateInto.js
index 156c8411c7233..6b5e6bffe0571 100644
--- a/packages/events/accumulateInto.js
+++ b/packages/events/accumulateInto.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 /**
  * Accumulates items that must not be null or undefined into the first one. This
diff --git a/packages/react-art/package.json b/packages/react-art/package.json
index c3863c483800d..bbd487f263196 100644
--- a/packages/react-art/package.json
+++ b/packages/react-art/package.json
@@ -20,7 +20,6 @@
   "dependencies": {
     "art": "^0.10.1",
     "create-react-class": "^15.6.2",
-    "fbjs": "^0.8.16",
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.0"
diff --git a/packages/react-art/src/ReactARTHostConfig.js b/packages/react-art/src/ReactARTHostConfig.js
index 2b109994166bb..33f91a77d4b7b 100644
--- a/packages/react-art/src/ReactARTHostConfig.js
+++ b/packages/react-art/src/ReactARTHostConfig.js
@@ -8,7 +8,7 @@
 import * as ReactScheduler from 'shared/ReactScheduler';
 import Transform from 'art/core/transform';
 import Mode from 'art/modes/current';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import {TYPES, EVENT_TYPES, childrenAsString} from './ReactARTInternals';
 
diff --git a/packages/react-dom/package.json b/packages/react-dom/package.json
index f6ba19cc43080..f46a72eec7923 100644
--- a/packages/react-dom/package.json
+++ b/packages/react-dom/package.json
@@ -13,7 +13,6 @@
   },
   "homepage": "https://reactjs.org/",
   "dependencies": {
-    "fbjs": "^0.8.16",
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.0"
diff --git a/packages/react-dom/src/__tests__/ReactCompositeComponent-test.js b/packages/react-dom/src/__tests__/ReactCompositeComponent-test.js
index d614d27dd3585..182564111f163 100644
--- a/packages/react-dom/src/__tests__/ReactCompositeComponent-test.js
+++ b/packages/react-dom/src/__tests__/ReactCompositeComponent-test.js
@@ -17,10 +17,50 @@ let ReactDOMServer;
 let ReactCurrentOwner;
 let ReactTestUtils;
 let PropTypes;
-let shallowEqual;
-let shallowCompare;
 
 describe('ReactCompositeComponent', () => {
+  const hasOwnProperty = Object.prototype.hasOwnProperty;
+
+  /**
+   * Performs equality by iterating through keys on an object and returning false
+   * when any key has values which are not strictly equal between the arguments.
+   * Returns true when the values of all keys are strictly equal.
+   */
+  function shallowEqual(objA: mixed, objB: mixed): boolean {
+    if (Object.is(objA, objB)) {
+      return true;
+    }
+    if (
+      typeof objA !== 'object' ||
+      objA === null ||
+      typeof objB !== 'object' ||
+      objB === null
+    ) {
+      return false;
+    }
+    const keysA = Object.keys(objA);
+    const keysB = Object.keys(objB);
+    if (keysA.length !== keysB.length) {
+      return false;
+    }
+    for (let i = 0; i < keysA.length; i++) {
+      if (
+        !hasOwnProperty.call(objB, keysA[i]) ||
+        !Object.is(objA[keysA[i]], objB[keysA[i]])
+      ) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  function shallowCompare(instance, nextProps, nextState) {
+    return (
+      !shallowEqual(instance.props, nextProps) ||
+      !shallowEqual(instance.state, nextState)
+    );
+  }
+
   beforeEach(() => {
     jest.resetModules();
     React = require('react');
@@ -30,14 +70,6 @@ describe('ReactCompositeComponent', () => {
       .__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactCurrentOwner;
     ReactTestUtils = require('react-dom/test-utils');
     PropTypes = require('prop-types');
-    shallowEqual = require('fbjs/lib/shallowEqual');
-
-    shallowCompare = function(instance, nextProps, nextState) {
-      return (
-        !shallowEqual(instance.props, nextProps) ||
-        !shallowEqual(instance.state, nextState)
-      );
-    };
 
     MorphingComponent = class extends React.Component {
       state = {activated: false};
diff --git a/packages/react-dom/src/__tests__/ReactDOMSelection-test.internal.js b/packages/react-dom/src/__tests__/ReactDOMSelection-test.internal.js
index b167084ad87ba..ec8850090be8b 100644
--- a/packages/react-dom/src/__tests__/ReactDOMSelection-test.internal.js
+++ b/packages/react-dom/src/__tests__/ReactDOMSelection-test.internal.js
@@ -12,7 +12,6 @@
 let React;
 let ReactDOM;
 let ReactDOMSelection;
-let invariant;
 
 let getModernOffsetsFromPoints;
 
@@ -21,7 +20,6 @@ describe('ReactDOMSelection', () => {
     React = require('react');
     ReactDOM = require('react-dom');
     ReactDOMSelection = require('../client/ReactDOMSelection');
-    invariant = require('fbjs/lib/invariant');
 
     ({getModernOffsetsFromPoints} = ReactDOMSelection);
   });
@@ -68,10 +66,9 @@ describe('ReactDOMSelection', () => {
     }
     traverse(outerNode);
 
-    invariant(
-      start !== null && end !== null,
-      'Provided anchor/focus nodes were outside of root.',
-    );
+    if (start === null || end === null) {
+      throw new Error('Provided anchor/focus nodes were outside of root.');
+    }
     return {start, end};
   }
 
diff --git a/packages/react-dom/src/client/ReactDOM.js b/packages/react-dom/src/client/ReactDOM.js
index 184e958142a90..363617fc7e701 100644
--- a/packages/react-dom/src/client/ReactDOM.js
+++ b/packages/react-dom/src/client/ReactDOM.js
@@ -31,9 +31,9 @@ import * as ReactInstanceMap from 'shared/ReactInstanceMap';
 import ReactVersion from 'shared/ReactVersion';
 import {ReactCurrentOwner} from 'shared/ReactGlobalSharedState';
 import getComponentName from 'shared/getComponentName';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 import lowPriorityWarning from 'shared/lowPriorityWarning';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 import * as ReactDOMComponentTree from './ReactDOMComponentTree';
 import * as ReactDOMFiberComponent from './ReactDOMFiberComponent';
diff --git a/packages/react-dom/src/client/ReactDOMComponentTree.js b/packages/react-dom/src/client/ReactDOMComponentTree.js
index d9c2e2d858aa8..a683df5b068de 100644
--- a/packages/react-dom/src/client/ReactDOMComponentTree.js
+++ b/packages/react-dom/src/client/ReactDOMComponentTree.js
@@ -6,7 +6,7 @@
  */
 
 import {HostComponent, HostText} from 'shared/ReactTypeOfWork';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 const randomKey = Math.random()
   .toString(36)
diff --git a/packages/react-dom/src/client/ReactDOMFiberComponent.js b/packages/react-dom/src/client/ReactDOMFiberComponent.js
index 4975e55f6731e..c7ec03ed12009 100644
--- a/packages/react-dom/src/client/ReactDOMFiberComponent.js
+++ b/packages/react-dom/src/client/ReactDOMFiberComponent.js
@@ -10,7 +10,7 @@
 // TODO: direct imports like some-package/src/* are bad. Fix me.
 import ReactDebugCurrentFiber from 'react-reconciler/src/ReactDebugCurrentFiber';
 import {registrationNameModules} from 'events/EventPluginRegistry';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 import * as DOMPropertyOperations from './DOMPropertyOperations';
 import * as ReactDOMFiberInput from './ReactDOMFiberInput';
diff --git a/packages/react-dom/src/client/ReactDOMFiberInput.js b/packages/react-dom/src/client/ReactDOMFiberInput.js
index 9483279516232..c164d984199a0 100644
--- a/packages/react-dom/src/client/ReactDOMFiberInput.js
+++ b/packages/react-dom/src/client/ReactDOMFiberInput.js
@@ -9,8 +9,8 @@
 
 // TODO: direct imports like some-package/src/* are bad. Fix me.
 import ReactDebugCurrentFiber from 'react-reconciler/src/ReactDebugCurrentFiber';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import * as DOMPropertyOperations from './DOMPropertyOperations';
 import {getFiberCurrentPropsFromNode} from './ReactDOMComponentTree';
diff --git a/packages/react-dom/src/client/ReactDOMFiberOption.js b/packages/react-dom/src/client/ReactDOMFiberOption.js
index 663b9cf22cc77..e5c04d23924a7 100644
--- a/packages/react-dom/src/client/ReactDOMFiberOption.js
+++ b/packages/react-dom/src/client/ReactDOMFiberOption.js
@@ -8,7 +8,7 @@
  */
 
 import React from 'react';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 let didWarnSelectedSetOnOption = false;
 
diff --git a/packages/react-dom/src/client/ReactDOMFiberSelect.js b/packages/react-dom/src/client/ReactDOMFiberSelect.js
index d0ed3ad01bd33..21c7e62ecec19 100644
--- a/packages/react-dom/src/client/ReactDOMFiberSelect.js
+++ b/packages/react-dom/src/client/ReactDOMFiberSelect.js
@@ -9,7 +9,7 @@
 
 // TODO: direct imports like some-package/src/* are bad. Fix me.
 import ReactDebugCurrentFiber from 'react-reconciler/src/ReactDebugCurrentFiber';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 import ReactControlledValuePropTypes from '../shared/ReactControlledValuePropTypes';
 
diff --git a/packages/react-dom/src/client/ReactDOMFiberTextarea.js b/packages/react-dom/src/client/ReactDOMFiberTextarea.js
index d167161435282..4ff024895e67e 100644
--- a/packages/react-dom/src/client/ReactDOMFiberTextarea.js
+++ b/packages/react-dom/src/client/ReactDOMFiberTextarea.js
@@ -7,8 +7,8 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 // TODO: direct imports like some-package/src/* are bad. Fix me.
 import ReactDebugCurrentFiber from 'react-reconciler/src/ReactDebugCurrentFiber';
 
diff --git a/packages/react-dom/src/client/validateDOMNesting.js b/packages/react-dom/src/client/validateDOMNesting.js
index 8f843f7a2f68c..3d3e17cd25800 100644
--- a/packages/react-dom/src/client/validateDOMNesting.js
+++ b/packages/react-dom/src/client/validateDOMNesting.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 // TODO: direct imports like some-package/src/* are bad. Fix me.
 import ReactDebugCurrentFiber from 'react-reconciler/src/ReactDebugCurrentFiber';
 
diff --git a/packages/react-dom/src/events/SimpleEventPlugin.js b/packages/react-dom/src/events/SimpleEventPlugin.js
index 8473b546fb655..b8b5c248a9edd 100644
--- a/packages/react-dom/src/events/SimpleEventPlugin.js
+++ b/packages/react-dom/src/events/SimpleEventPlugin.js
@@ -22,7 +22,7 @@ import {accumulateTwoPhaseDispatches} from 'events/EventPropagators';
 import SyntheticEvent from 'events/SyntheticEvent';
 
 import * as DOMTopLevelEventTypes from './DOMTopLevelEventTypes';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 import SyntheticAnimationEvent from './SyntheticAnimationEvent';
 import SyntheticClipboardEvent from './SyntheticClipboardEvent';
diff --git a/packages/react-dom/src/server/ReactDOMServerBrowser.js b/packages/react-dom/src/server/ReactDOMServerBrowser.js
index 1edfbce979ac9..43044191474c1 100644
--- a/packages/react-dom/src/server/ReactDOMServerBrowser.js
+++ b/packages/react-dom/src/server/ReactDOMServerBrowser.js
@@ -6,7 +6,7 @@
  */
 
 import ReactVersion from 'shared/ReactVersion';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import {renderToString, renderToStaticMarkup} from './ReactDOMStringRenderer';
 
diff --git a/packages/react-dom/src/server/ReactPartialRenderer.js b/packages/react-dom/src/server/ReactPartialRenderer.js
index 87673bd4eb923..04234411f2a93 100644
--- a/packages/react-dom/src/server/ReactPartialRenderer.js
+++ b/packages/react-dom/src/server/ReactPartialRenderer.js
@@ -15,9 +15,9 @@ import type {
 } from 'shared/ReactTypes';
 
 import React from 'react';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 import lowPriorityWarning from 'shared/lowPriorityWarning';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 import checkPropTypes from 'prop-types/checkPropTypes';
 import describeComponentFrame from 'shared/describeComponentFrame';
 import {ReactDebugCurrentFrame} from 'shared/ReactGlobalSharedState';
diff --git a/packages/react-dom/src/shared/DOMProperty.js b/packages/react-dom/src/shared/DOMProperty.js
index b01c069dbad0c..31f222b978854 100644
--- a/packages/react-dom/src/shared/DOMProperty.js
+++ b/packages/react-dom/src/shared/DOMProperty.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 type PropertyType = 0 | 1 | 2 | 3 | 4 | 5 | 6;
 
diff --git a/packages/react-dom/src/shared/ReactDOMInvalidARIAHook.js b/packages/react-dom/src/shared/ReactDOMInvalidARIAHook.js
index 0020b4ba668ea..def8ce5a26fb2 100644
--- a/packages/react-dom/src/shared/ReactDOMInvalidARIAHook.js
+++ b/packages/react-dom/src/shared/ReactDOMInvalidARIAHook.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 import {ReactDebugCurrentFrame} from 'shared/ReactGlobalSharedState';
 
 import {ATTRIBUTE_NAME_CHAR} from './DOMProperty';
diff --git a/packages/react-dom/src/shared/ReactDOMNullInputValuePropHook.js b/packages/react-dom/src/shared/ReactDOMNullInputValuePropHook.js
index 018054cb301ee..b8e5aeb2316f9 100644
--- a/packages/react-dom/src/shared/ReactDOMNullInputValuePropHook.js
+++ b/packages/react-dom/src/shared/ReactDOMNullInputValuePropHook.js
@@ -6,7 +6,7 @@
  */
 
 import {ReactDebugCurrentFrame} from 'shared/ReactGlobalSharedState';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 let didWarnValueNull = false;
 
diff --git a/packages/react-dom/src/shared/ReactDOMUnknownPropertyHook.js b/packages/react-dom/src/shared/ReactDOMUnknownPropertyHook.js
index 399a7d89ce5c4..80607b6b65284 100644
--- a/packages/react-dom/src/shared/ReactDOMUnknownPropertyHook.js
+++ b/packages/react-dom/src/shared/ReactDOMUnknownPropertyHook.js
@@ -10,7 +10,7 @@ import {
   possibleRegistrationNames,
 } from 'events/EventPluginRegistry';
 import {ReactDebugCurrentFrame} from 'shared/ReactGlobalSharedState';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 import {
   ATTRIBUTE_NAME_CHAR,
diff --git a/packages/react-dom/src/shared/assertValidProps.js b/packages/react-dom/src/shared/assertValidProps.js
index 60c0ff4f7cfd3..b7985858777a2 100644
--- a/packages/react-dom/src/shared/assertValidProps.js
+++ b/packages/react-dom/src/shared/assertValidProps.js
@@ -5,8 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import voidElementTags from './voidElementTags';
 
diff --git a/packages/react-dom/src/shared/checkReact.js b/packages/react-dom/src/shared/checkReact.js
index ff7192c688ef8..8ce3d0082b930 100644
--- a/packages/react-dom/src/shared/checkReact.js
+++ b/packages/react-dom/src/shared/checkReact.js
@@ -8,7 +8,7 @@
  */
 
 import React from 'react';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 invariant(
   React,
diff --git a/packages/react-dom/src/shared/warnValidStyle.js b/packages/react-dom/src/shared/warnValidStyle.js
index 0231d589bb59b..d616c9b3c9071 100644
--- a/packages/react-dom/src/shared/warnValidStyle.js
+++ b/packages/react-dom/src/shared/warnValidStyle.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 let warnValidStyle = () => {};
 
diff --git a/packages/react-dom/src/test-utils/ReactTestUtils.js b/packages/react-dom/src/test-utils/ReactTestUtils.js
index d9948291b3cf0..cc0c5a89f7f57 100644
--- a/packages/react-dom/src/test-utils/ReactTestUtils.js
+++ b/packages/react-dom/src/test-utils/ReactTestUtils.js
@@ -16,7 +16,7 @@ import {
   HostText,
 } from 'shared/ReactTypeOfWork';
 import SyntheticEvent from 'events/SyntheticEvent';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import * as DOMTopLevelEventTypes from '../events/DOMTopLevelEventTypes';
 
diff --git a/packages/react-native-renderer/package.json b/packages/react-native-renderer/package.json
index 73e282f2c2aee..d5157f1254e7e 100644
--- a/packages/react-native-renderer/package.json
+++ b/packages/react-native-renderer/package.json
@@ -4,7 +4,6 @@
   "private": true,
   "repository": "facebook/react",
   "dependencies": {
-    "fbjs": "^0.8.16",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.0"
   },
diff --git a/packages/react-native-renderer/src/NativeMethodsMixin.js b/packages/react-native-renderer/src/NativeMethodsMixin.js
index c7caa562c51b2..5c38b29656f20 100644
--- a/packages/react-native-renderer/src/NativeMethodsMixin.js
+++ b/packages/react-native-renderer/src/NativeMethodsMixin.js
@@ -15,7 +15,7 @@ import type {
   ReactNativeBaseComponentViewConfig,
 } from './ReactNativeTypes';
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 // Modules provided by RN:
 import TextInputState from 'TextInputState';
 import UIManager from 'UIManager';
diff --git a/packages/react-native-renderer/src/ReactFabric.js b/packages/react-native-renderer/src/ReactFabric.js
index 0634921b68fec..63cc05480b532 100644
--- a/packages/react-native-renderer/src/ReactFabric.js
+++ b/packages/react-native-renderer/src/ReactFabric.js
@@ -25,7 +25,7 @@ import {getInspectorDataForViewTag} from './ReactNativeFiberInspector';
 
 import {ReactCurrentOwner} from 'shared/ReactGlobalSharedState';
 import getComponentName from 'shared/getComponentName';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 const findHostInstance = ReactFabricRenderer.findHostInstance;
 
diff --git a/packages/react-native-renderer/src/ReactFabricComponentTree.js b/packages/react-native-renderer/src/ReactFabricComponentTree.js
index 23f5ce9b950ea..4eca1b8fd9171 100644
--- a/packages/react-native-renderer/src/ReactFabricComponentTree.js
+++ b/packages/react-native-renderer/src/ReactFabricComponentTree.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 function getInstanceFromInstance(instanceHandle) {
   return instanceHandle;
diff --git a/packages/react-native-renderer/src/ReactFabricHostConfig.js b/packages/react-native-renderer/src/ReactFabricHostConfig.js
index ef4525d8e5cc7..65443762b1b80 100644
--- a/packages/react-native-renderer/src/ReactFabricHostConfig.js
+++ b/packages/react-native-renderer/src/ReactFabricHostConfig.js
@@ -21,7 +21,7 @@ import * as ReactNativeFrameScheduling from './ReactNativeFrameScheduling';
 import * as ReactNativeViewConfigRegistry from 'ReactNativeViewConfigRegistry';
 
 import deepFreezeAndThrowOnMutationInDev from 'deepFreezeAndThrowOnMutationInDev';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import {dispatchEvent} from './ReactFabricEventEmitter';
 
diff --git a/packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js b/packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js
index 59cd7c8f28b2f..f932968c45c89 100644
--- a/packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js
+++ b/packages/react-native-renderer/src/ReactNativeBridgeEventPlugin.js
@@ -15,7 +15,7 @@ import {
 import type {TopLevelType} from 'events/TopLevelEventTypes';
 import * as ReactNativeViewConfigRegistry from 'ReactNativeViewConfigRegistry';
 import SyntheticEvent from 'events/SyntheticEvent';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 const {
   customBubblingEventTypes,
diff --git a/packages/react-native-renderer/src/ReactNativeComponentTree.js b/packages/react-native-renderer/src/ReactNativeComponentTree.js
index 32554cd0bc7c2..cd1e50f3b8d20 100644
--- a/packages/react-native-renderer/src/ReactNativeComponentTree.js
+++ b/packages/react-native-renderer/src/ReactNativeComponentTree.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 const instanceCache = {};
 const instanceProps = {};
diff --git a/packages/react-native-renderer/src/ReactNativeEventEmitter.js b/packages/react-native-renderer/src/ReactNativeEventEmitter.js
index 6b61de63319bd..760887abba5c5 100644
--- a/packages/react-native-renderer/src/ReactNativeEventEmitter.js
+++ b/packages/react-native-renderer/src/ReactNativeEventEmitter.js
@@ -10,7 +10,7 @@
 import {getListener, runExtractedEventsInBatch} from 'events/EventPluginHub';
 import {registrationNameModules} from 'events/EventPluginRegistry';
 import {batchedUpdates} from 'events/ReactGenericBatching';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 import {getInstanceFromNode} from './ReactNativeComponentTree';
 
diff --git a/packages/react-native-renderer/src/ReactNativeFiberInspector.js b/packages/react-native-renderer/src/ReactNativeFiberInspector.js
index 169e2f40ad25f..766e05760e4a8 100644
--- a/packages/react-native-renderer/src/ReactNativeFiberInspector.js
+++ b/packages/react-native-renderer/src/ReactNativeFiberInspector.js
@@ -15,7 +15,7 @@ import {
 } from 'react-reconciler/reflection';
 import getComponentName from 'shared/getComponentName';
 import {HostComponent} from 'shared/ReactTypeOfWork';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 // Module provided by RN:
 import UIManager from 'UIManager';
 
diff --git a/packages/react-native-renderer/src/ReactNativeHostConfig.js b/packages/react-native-renderer/src/ReactNativeHostConfig.js
index 03ce2dc6e023d..8c01e0ec942db 100644
--- a/packages/react-native-renderer/src/ReactNativeHostConfig.js
+++ b/packages/react-native-renderer/src/ReactNativeHostConfig.js
@@ -9,7 +9,7 @@
 
 import type {ReactNativeBaseComponentViewConfig} from './ReactNativeTypes';
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 // Modules provided by RN:
 import UIManager from 'UIManager';
diff --git a/packages/react-native-renderer/src/ReactNativeRenderer.js b/packages/react-native-renderer/src/ReactNativeRenderer.js
index 6ddc034282d84..9ff1749c50b84 100644
--- a/packages/react-native-renderer/src/ReactNativeRenderer.js
+++ b/packages/react-native-renderer/src/ReactNativeRenderer.js
@@ -28,7 +28,7 @@ import {getInspectorDataForViewTag} from './ReactNativeFiberInspector';
 
 import {ReactCurrentOwner} from 'shared/ReactGlobalSharedState';
 import getComponentName from 'shared/getComponentName';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 const findHostInstance = ReactNativeFiberRenderer.findHostInstance;
 
diff --git a/packages/react-native-renderer/src/__mocks__/FabricUIManager.js b/packages/react-native-renderer/src/__mocks__/FabricUIManager.js
index 3fcf573ab8a50..6e5a2690795d4 100644
--- a/packages/react-native-renderer/src/__mocks__/FabricUIManager.js
+++ b/packages/react-native-renderer/src/__mocks__/FabricUIManager.js
@@ -9,7 +9,7 @@
 
 // Mock of the Native Hooks
 
-const invariant = require('fbjs/lib/invariant');
+import invariant from 'shared/invariant';
 
 const roots = new Map();
 const allocatedTags = new Set();
diff --git a/packages/react-native-renderer/src/__mocks__/ReactNativeViewConfigRegistry.js b/packages/react-native-renderer/src/__mocks__/ReactNativeViewConfigRegistry.js
index c8ed940a86095..63476367e5d06 100644
--- a/packages/react-native-renderer/src/__mocks__/ReactNativeViewConfigRegistry.js
+++ b/packages/react-native-renderer/src/__mocks__/ReactNativeViewConfigRegistry.js
@@ -13,7 +13,7 @@ import type {
   ViewConfigGetter,
 } from './ReactNativeTypes';
 
-const invariant = require('fbjs/lib/invariant');
+import invariant from 'shared/invariant';
 
 // Event configs
 const customBubblingEventTypes = {};
diff --git a/packages/react-native-renderer/src/__mocks__/UIManager.js b/packages/react-native-renderer/src/__mocks__/UIManager.js
index 4a234fbdc11ee..b3f7ac6c5fa7d 100644
--- a/packages/react-native-renderer/src/__mocks__/UIManager.js
+++ b/packages/react-native-renderer/src/__mocks__/UIManager.js
@@ -9,7 +9,7 @@
 
 // Mock of the Native Hooks
 
-const invariant = require('fbjs/lib/invariant');
+import invariant from 'shared/invariant';
 
 // Map of viewTag -> {children: [childTag], parent: ?parentTag}
 const roots = [];
diff --git a/packages/react-noop-renderer/package.json b/packages/react-noop-renderer/package.json
index 25b3a429e5614..99b44fd28983c 100644
--- a/packages/react-noop-renderer/package.json
+++ b/packages/react-noop-renderer/package.json
@@ -7,7 +7,6 @@
   "repository": "facebook/react",
   "license": "MIT",
   "dependencies": {
-    "fbjs": "^0.8.16",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.0",
     "regenerator-runtime": "^0.11.0",
diff --git a/packages/react-reconciler/package.json b/packages/react-reconciler/package.json
index 586796e2fb254..d6acdf4c7aebd 100644
--- a/packages/react-reconciler/package.json
+++ b/packages/react-reconciler/package.json
@@ -25,7 +25,6 @@
     "react": "^16.0.0"
   },
   "dependencies": {
-    "fbjs": "^0.8.16",
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.0"
diff --git a/packages/react-reconciler/src/ReactChildFiber.js b/packages/react-reconciler/src/ReactChildFiber.js
index 3caf4db2a14e0..19bdfbd0598eb 100644
--- a/packages/react-reconciler/src/ReactChildFiber.js
+++ b/packages/react-reconciler/src/ReactChildFiber.js
@@ -28,8 +28,8 @@ import {
   Fragment,
 } from 'shared/ReactTypeOfWork';
 import {getStackAddendumByWorkInProgressFiber} from 'shared/ReactFiberComponentTreeHook';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import {
   createWorkInProgress,
diff --git a/packages/react-reconciler/src/ReactFiber.js b/packages/react-reconciler/src/ReactFiber.js
index 34ee91645d79f..2b29ea79aae5b 100644
--- a/packages/react-reconciler/src/ReactFiber.js
+++ b/packages/react-reconciler/src/ReactFiber.js
@@ -15,7 +15,7 @@ import type {TypeOfSideEffect} from 'shared/ReactTypeOfSideEffect';
 import type {ExpirationTime} from './ReactFiberExpirationTime';
 import type {UpdateQueue} from './ReactUpdateQueue';
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 import {enableProfilerTimer} from 'shared/ReactFeatureFlags';
 import {NoEffect} from 'shared/ReactTypeOfSideEffect';
 import {
diff --git a/packages/react-reconciler/src/ReactFiberBeginWork.js b/packages/react-reconciler/src/ReactFiberBeginWork.js
index 135e85bb0ba6c..d2573168ec343 100644
--- a/packages/react-reconciler/src/ReactFiberBeginWork.js
+++ b/packages/react-reconciler/src/ReactFiberBeginWork.js
@@ -46,10 +46,10 @@ import {
   debugRenderPhaseSideEffectsForStrictMode,
   enableProfilerTimer,
 } from 'shared/ReactFeatureFlags';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 import getComponentName from 'shared/getComponentName';
 import ReactStrictModeWarnings from './ReactStrictModeWarnings';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 import ReactDebugCurrentFiber from './ReactDebugCurrentFiber';
 import {cancelWorkTimer} from './ReactDebugFiberPerf';
 
diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.js b/packages/react-reconciler/src/ReactFiberClassComponent.js
index a158b9c0d16cc..444bd104c232b 100644
--- a/packages/react-reconciler/src/ReactFiberClassComponent.js
+++ b/packages/react-reconciler/src/ReactFiberClassComponent.js
@@ -22,8 +22,8 @@ import {isMounted} from 'react-reconciler/reflection';
 import * as ReactInstanceMap from 'shared/ReactInstanceMap';
 import shallowEqual from 'shared/shallowEqual';
 import getComponentName from 'shared/getComponentName';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import {startPhaseTimer, stopPhaseTimer} from './ReactDebugFiberPerf';
 import {StrictMode} from './ReactTypeOfMode';
diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.js b/packages/react-reconciler/src/ReactFiberCommitWork.js
index f9a3dce20044d..786c745b42898 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.js
@@ -38,8 +38,8 @@ import {
   Update,
 } from 'shared/ReactTypeOfSideEffect';
 import {commitUpdateQueue} from './ReactUpdateQueue';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import {onCommitUnmount} from './ReactFiberDevToolsHook';
 import {startPhaseTimer, stopPhaseTimer} from './ReactDebugFiberPerf';
diff --git a/packages/react-reconciler/src/ReactFiberCompleteWork.js b/packages/react-reconciler/src/ReactFiberCompleteWork.js
index d9b469c94d1bc..e8db8f19e8432 100644
--- a/packages/react-reconciler/src/ReactFiberCompleteWork.js
+++ b/packages/react-reconciler/src/ReactFiberCompleteWork.js
@@ -39,7 +39,7 @@ import {
 } from 'shared/ReactTypeOfWork';
 import {Placement, Ref, Update} from 'shared/ReactTypeOfSideEffect';
 import {ProfileMode} from './ReactTypeOfMode';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import {
   createInstance,
diff --git a/packages/react-reconciler/src/ReactFiberContext.js b/packages/react-reconciler/src/ReactFiberContext.js
index 5cad370b96b31..1a1a30f35e014 100644
--- a/packages/react-reconciler/src/ReactFiberContext.js
+++ b/packages/react-reconciler/src/ReactFiberContext.js
@@ -13,8 +13,8 @@ import type {StackCursor} from './ReactFiberStack';
 import {isFiberMounted} from 'react-reconciler/reflection';
 import {ClassComponent, HostRoot} from 'shared/ReactTypeOfWork';
 import getComponentName from 'shared/getComponentName';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 import checkPropTypes from 'prop-types/checkPropTypes';
 
 import ReactDebugCurrentFiber from './ReactDebugCurrentFiber';
diff --git a/packages/react-reconciler/src/ReactFiberDevToolsHook.js b/packages/react-reconciler/src/ReactFiberDevToolsHook.js
index e7d77fd99cc9e..dd58854070103 100644
--- a/packages/react-reconciler/src/ReactFiberDevToolsHook.js
+++ b/packages/react-reconciler/src/ReactFiberDevToolsHook.js
@@ -10,7 +10,7 @@
 import type {Fiber} from './ReactFiber';
 import type {FiberRoot} from './ReactFiberRoot';
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 declare var __REACT_DEVTOOLS_GLOBAL_HOOK__: Object | void;
 
diff --git a/packages/react-reconciler/src/ReactFiberHostConfig.js b/packages/react-reconciler/src/ReactFiberHostConfig.js
index d06b75b9a4965..c55a36c9b8ff1 100644
--- a/packages/react-reconciler/src/ReactFiberHostConfig.js
+++ b/packages/react-reconciler/src/ReactFiberHostConfig.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 // We expect that our Rollup, Jest, and Flow configurations
 // always shim this module with the corresponding host config
diff --git a/packages/react-reconciler/src/ReactFiberHostContext.js b/packages/react-reconciler/src/ReactFiberHostContext.js
index 4f091e610b559..500d5815ad614 100644
--- a/packages/react-reconciler/src/ReactFiberHostContext.js
+++ b/packages/react-reconciler/src/ReactFiberHostContext.js
@@ -11,7 +11,7 @@ import type {Fiber} from './ReactFiber';
 import type {StackCursor} from './ReactFiberStack';
 import type {Container, HostContext} from './ReactFiberHostConfig';
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import {getChildHostContext, getRootHostContext} from './ReactFiberHostConfig';
 import {createCursor, push, pop} from './ReactFiberStack';
diff --git a/packages/react-reconciler/src/ReactFiberHydrationContext.js b/packages/react-reconciler/src/ReactFiberHydrationContext.js
index bc4b9eae80e77..8983333a308d5 100644
--- a/packages/react-reconciler/src/ReactFiberHydrationContext.js
+++ b/packages/react-reconciler/src/ReactFiberHydrationContext.js
@@ -18,7 +18,7 @@ import type {
 
 import {HostComponent, HostText, HostRoot} from 'shared/ReactTypeOfWork';
 import {Deletion, Placement} from 'shared/ReactTypeOfSideEffect';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import {createFiberFromHostInstanceForDeletion} from './ReactFiber';
 import {
diff --git a/packages/react-reconciler/src/ReactFiberNewContext.js b/packages/react-reconciler/src/ReactFiberNewContext.js
index f2715acfb2751..4826412dded63 100644
--- a/packages/react-reconciler/src/ReactFiberNewContext.js
+++ b/packages/react-reconciler/src/ReactFiberNewContext.js
@@ -18,7 +18,7 @@ export type NewContext = {
   getContextChangedBits(context: ReactContext<any>): number,
 };
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 import {isPrimaryRenderer} from './ReactFiberHostConfig';
 import {createCursor, push, pop} from './ReactFiberStack';
 
diff --git a/packages/react-reconciler/src/ReactFiberReconciler.js b/packages/react-reconciler/src/ReactFiberReconciler.js
index 61ed86e323cb2..3e1c36866fc87 100644
--- a/packages/react-reconciler/src/ReactFiberReconciler.js
+++ b/packages/react-reconciler/src/ReactFiberReconciler.js
@@ -25,8 +25,8 @@ import {
 import * as ReactInstanceMap from 'shared/ReactInstanceMap';
 import {HostComponent} from 'shared/ReactTypeOfWork';
 import getComponentName from 'shared/getComponentName';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import {getPublicInstance} from './ReactFiberHostConfig';
 import {
diff --git a/packages/react-reconciler/src/ReactFiberScheduler.js b/packages/react-reconciler/src/ReactFiberScheduler.js
index 92b83f4414044..1272f69f9662b 100644
--- a/packages/react-reconciler/src/ReactFiberScheduler.js
+++ b/packages/react-reconciler/src/ReactFiberScheduler.js
@@ -45,8 +45,8 @@ import {
   warnAboutLegacyContextAPI,
 } from 'shared/ReactFeatureFlags';
 import getComponentName from 'shared/getComponentName';
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import ReactFiberInstrumentation from './ReactFiberInstrumentation';
 import ReactDebugCurrentFiber from './ReactDebugCurrentFiber';
diff --git a/packages/react-reconciler/src/ReactFiberStack.js b/packages/react-reconciler/src/ReactFiberStack.js
index 9c45e11d1f719..c108e89891784 100644
--- a/packages/react-reconciler/src/ReactFiberStack.js
+++ b/packages/react-reconciler/src/ReactFiberStack.js
@@ -9,7 +9,7 @@
 
 import type {Fiber} from './ReactFiber';
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 export type StackCursor<T> = {
   current: T,
diff --git a/packages/react-reconciler/src/ReactFiberTreeReflection.js b/packages/react-reconciler/src/ReactFiberTreeReflection.js
index c988465b756f8..394a4b3871690 100644
--- a/packages/react-reconciler/src/ReactFiberTreeReflection.js
+++ b/packages/react-reconciler/src/ReactFiberTreeReflection.js
@@ -9,8 +9,8 @@
 
 import type {Fiber} from 'react-reconciler/src/ReactFiber';
 
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 import * as ReactInstanceMap from 'shared/ReactInstanceMap';
 import {ReactCurrentOwner} from 'shared/ReactGlobalSharedState';
diff --git a/packages/react-reconciler/src/ReactProfilerTimer.js b/packages/react-reconciler/src/ReactProfilerTimer.js
index 7877d7d2977ac..b1455195a8ede 100644
--- a/packages/react-reconciler/src/ReactProfilerTimer.js
+++ b/packages/react-reconciler/src/ReactProfilerTimer.js
@@ -12,7 +12,7 @@ import type {Fiber} from './ReactFiber';
 import getComponentName from 'shared/getComponentName';
 import {enableProfilerTimer} from 'shared/ReactFeatureFlags';
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 import {now} from './ReactFiberHostConfig';
 
 export type ProfilerTimer = {
diff --git a/packages/react-reconciler/src/ReactStrictModeWarnings.js b/packages/react-reconciler/src/ReactStrictModeWarnings.js
index 9ca543583cf01..365f4bf4d6f00 100644
--- a/packages/react-reconciler/src/ReactStrictModeWarnings.js
+++ b/packages/react-reconciler/src/ReactStrictModeWarnings.js
@@ -13,7 +13,7 @@ import getComponentName from 'shared/getComponentName';
 import {getStackAddendumByWorkInProgressFiber} from 'shared/ReactFiberComponentTreeHook';
 import {StrictMode} from './ReactTypeOfMode';
 import lowPriorityWarning from 'shared/lowPriorityWarning';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 type LIFECYCLE =
   | 'UNSAFE_componentWillMount'
diff --git a/packages/react-reconciler/src/ReactUpdateQueue.js b/packages/react-reconciler/src/ReactUpdateQueue.js
index dc3791c4e1701..1e28051d58bef 100644
--- a/packages/react-reconciler/src/ReactUpdateQueue.js
+++ b/packages/react-reconciler/src/ReactUpdateQueue.js
@@ -102,8 +102,8 @@ import {
 
 import {StrictMode} from './ReactTypeOfMode';
 
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 
 export type Update<State> = {
   expirationTime: ExpirationTime,
diff --git a/packages/react-reconciler/src/forks/ReactFiberErrorDialog.www.js b/packages/react-reconciler/src/forks/ReactFiberErrorDialog.www.js
index 16d9f71c4c999..433448e0c33e0 100644
--- a/packages/react-reconciler/src/forks/ReactFiberErrorDialog.www.js
+++ b/packages/react-reconciler/src/forks/ReactFiberErrorDialog.www.js
@@ -9,7 +9,7 @@
 
 import type {CapturedError} from '../ReactCapturedValue';
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 // Provided by www
 const ReactFiberErrorDialogWWW = require('ReactFiberErrorDialog');
diff --git a/packages/react-scheduler/package.json b/packages/react-scheduler/package.json
index b5bc00dde16e0..633f48859bcd6 100644
--- a/packages/react-scheduler/package.json
+++ b/packages/react-scheduler/package.json
@@ -14,7 +14,6 @@
   },
   "homepage": "https://reactjs.org/",
   "dependencies": {
-    "fbjs": "^0.8.16",
     "object-assign": "^4.1.1"
   },
   "files": [
diff --git a/packages/react-scheduler/src/ReactScheduler.js b/packages/react-scheduler/src/ReactScheduler.js
index 4667cfc725ed8..2b016f1275739 100644
--- a/packages/react-scheduler/src/ReactScheduler.js
+++ b/packages/react-scheduler/src/ReactScheduler.js
@@ -42,7 +42,7 @@ type CallbackConfigType = {|
 export type CallbackIdType = CallbackConfigType;
 
 import {canUseDOM} from 'shared/ExecutionEnvironment';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 if (__DEV__) {
   if (canUseDOM && typeof requestAnimationFrame !== 'function') {
diff --git a/packages/react-test-renderer/package.json b/packages/react-test-renderer/package.json
index 6aafaf967b7cf..e1139ddf11e42 100644
--- a/packages/react-test-renderer/package.json
+++ b/packages/react-test-renderer/package.json
@@ -15,7 +15,6 @@
   },
   "homepage": "https://reactjs.org/",
   "dependencies": {
-    "fbjs": "^0.8.16",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.0",
     "react-is": "^16.4.1"
diff --git a/packages/react-test-renderer/src/ReactShallowRenderer.js b/packages/react-test-renderer/src/ReactShallowRenderer.js
index 65020d4842b67..54f671e6607d0 100644
--- a/packages/react-test-renderer/src/ReactShallowRenderer.js
+++ b/packages/react-test-renderer/src/ReactShallowRenderer.js
@@ -11,7 +11,7 @@ import {isForwardRef} from 'react-is';
 import describeComponentFrame from 'shared/describeComponentFrame';
 import getComponentName from 'shared/getComponentName';
 import shallowEqual from 'shared/shallowEqual';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 import checkPropTypes from 'prop-types/checkPropTypes';
 
 const emptyObject = {};
diff --git a/packages/react-test-renderer/src/ReactTestRenderer.js b/packages/react-test-renderer/src/ReactTestRenderer.js
index 711f8f6a5e2bb..669e1e7abd5f8 100644
--- a/packages/react-test-renderer/src/ReactTestRenderer.js
+++ b/packages/react-test-renderer/src/ReactTestRenderer.js
@@ -28,7 +28,7 @@ import {
   ForwardRef,
   Profiler,
 } from 'shared/ReactTypeOfWork';
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import * as ReactTestHostConfig from './ReactTestHostConfig';
 import * as TestRendererScheduling from './ReactTestRendererScheduling';
diff --git a/packages/react/package.json b/packages/react/package.json
index a69208d563519..f5a8ecd12552d 100644
--- a/packages/react/package.json
+++ b/packages/react/package.json
@@ -21,7 +21,6 @@
     "node": ">=0.10.0"
   },
   "dependencies": {
-    "fbjs": "^0.8.16",
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.1",
     "prop-types": "^15.6.0"
diff --git a/packages/react/src/ReactBaseClasses.js b/packages/react/src/ReactBaseClasses.js
index 3f92549e1a6cf..e1682d128ee60 100644
--- a/packages/react/src/ReactBaseClasses.js
+++ b/packages/react/src/ReactBaseClasses.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 import lowPriorityWarning from 'shared/lowPriorityWarning';
 
 import ReactNoopUpdateQueue from './ReactNoopUpdateQueue';
diff --git a/packages/react/src/ReactChildren.js b/packages/react/src/ReactChildren.js
index e01f765c9ba01..0bbe5bee14de4 100644
--- a/packages/react/src/ReactChildren.js
+++ b/packages/react/src/ReactChildren.js
@@ -5,8 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 import {
   getIteratorFn,
   REACT_ELEMENT_TYPE,
diff --git a/packages/react/src/ReactContext.js b/packages/react/src/ReactContext.js
index d15163e81346c..4c1b06bfed5d3 100644
--- a/packages/react/src/ReactContext.js
+++ b/packages/react/src/ReactContext.js
@@ -11,7 +11,7 @@ import {REACT_PROVIDER_TYPE, REACT_CONTEXT_TYPE} from 'shared/ReactSymbols';
 
 import type {ReactContext} from 'shared/ReactTypes';
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 export function createContext<T>(
   defaultValue: T,
diff --git a/packages/react/src/ReactElement.js b/packages/react/src/ReactElement.js
index 9127453b9b55e..80cd607956990 100644
--- a/packages/react/src/ReactElement.js
+++ b/packages/react/src/ReactElement.js
@@ -5,8 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import invariant from 'fbjs/lib/invariant';
-import warning from 'fbjs/lib/warning';
+import invariant from 'shared/invariant';
+import warning from 'shared/warning';
 import {REACT_ELEMENT_TYPE} from 'shared/ReactSymbols';
 
 import ReactCurrentOwner from './ReactCurrentOwner';
diff --git a/packages/react/src/ReactElementValidator.js b/packages/react/src/ReactElementValidator.js
index 35dc391f435a2..f0ea9601b8a37 100644
--- a/packages/react/src/ReactElementValidator.js
+++ b/packages/react/src/ReactElementValidator.js
@@ -22,7 +22,7 @@ import {
   REACT_FRAGMENT_TYPE,
 } from 'shared/ReactSymbols';
 import checkPropTypes from 'prop-types/checkPropTypes';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 import ReactCurrentOwner from './ReactCurrentOwner';
 import {isValidElement, createElement, cloneElement} from './ReactElement';
diff --git a/packages/react/src/ReactNoopUpdateQueue.js b/packages/react/src/ReactNoopUpdateQueue.js
index ffd47dacb483a..d21cd561ce35d 100644
--- a/packages/react/src/ReactNoopUpdateQueue.js
+++ b/packages/react/src/ReactNoopUpdateQueue.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 const didWarnStateUpdateForUnmountedComponent = {};
 
diff --git a/packages/react/src/forwardRef.js b/packages/react/src/forwardRef.js
index 6c3c1a4343ba9..419af668a3049 100644
--- a/packages/react/src/forwardRef.js
+++ b/packages/react/src/forwardRef.js
@@ -7,7 +7,7 @@
 
 import {REACT_FORWARD_REF_TYPE} from 'shared/ReactSymbols';
 
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 export default function forwardRef<Props, ElementType: React$ElementType>(
   render: (props: Props, ref: React$ElementRef<ElementType>) => React$Node,
diff --git a/packages/shared/HostConfigWithNoHydration.js b/packages/shared/HostConfigWithNoHydration.js
index 9458bd50aee83..66bd02fb1b732 100644
--- a/packages/shared/HostConfigWithNoHydration.js
+++ b/packages/shared/HostConfigWithNoHydration.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 // Renderers that don't support hydration
 // can re-export everything from this module.
diff --git a/packages/shared/HostConfigWithNoMutation.js b/packages/shared/HostConfigWithNoMutation.js
index 5bce3c671df4f..bb0b7f425b6f6 100644
--- a/packages/shared/HostConfigWithNoMutation.js
+++ b/packages/shared/HostConfigWithNoMutation.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 // Renderers that don't support mutation
 // can re-export everything from this module.
diff --git a/packages/shared/HostConfigWithNoPersistence.js b/packages/shared/HostConfigWithNoPersistence.js
index 83e845d6e73ca..1977cb2f7911f 100644
--- a/packages/shared/HostConfigWithNoPersistence.js
+++ b/packages/shared/HostConfigWithNoPersistence.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 // Renderers that don't support persistence
 // can re-export everything from this module.
diff --git a/packages/shared/ReactErrorUtils.js b/packages/shared/ReactErrorUtils.js
index 2373e2527ed6f..ef3cb31a78370 100644
--- a/packages/shared/ReactErrorUtils.js
+++ b/packages/shared/ReactErrorUtils.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 import invokeGuardedCallback from './invokeGuardedCallback';
 
 const ReactErrorUtils = {
diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
index 003d96fe9522f..b3d2b48500549 100644
--- a/packages/shared/ReactFeatureFlags.js
+++ b/packages/shared/ReactFeatureFlags.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 // Exports ReactDOM.createRoot
 export const enableUserTimingAPI = __DEV__;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fabric-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fabric-fb.js
index 1d45d79c79b2a..bd557015195fb 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fabric-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fabric-fb.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as FabricFeatureFlagsType from './ReactFeatureFlags.native-fabric-fb';
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fabric-oss.js b/packages/shared/forks/ReactFeatureFlags.native-fabric-oss.js
index 80aa2d7e46f86..ea6c7cf6d9ec1 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fabric-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fabric-oss.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as FabricFeatureFlagsType from './ReactFeatureFlags.native-fabric-oss';
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index d36c0143c1c51..b0fdc77f3a51e 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as FeatureFlagsShimType from './ReactFeatureFlags.native-fb';
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
index 5f4511c8ddda9..3c2b19bf1b580 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as FeatureFlagsShimType from './ReactFeatureFlags.native-oss';
diff --git a/packages/shared/forks/ReactFeatureFlags.persistent.js b/packages/shared/forks/ReactFeatureFlags.persistent.js
index 8203c2c9317f5..88773cf900b3b 100644
--- a/packages/shared/forks/ReactFeatureFlags.persistent.js
+++ b/packages/shared/forks/ReactFeatureFlags.persistent.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as PersistentFeatureFlagsType from './ReactFeatureFlags.persistent';
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
index 70f055d5a228d..1bc79a7b3f440 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as PersistentFeatureFlagsType from './ReactFeatureFlags.persistent';
diff --git a/packages/shared/forks/invariant.www.js b/packages/shared/forks/invariant.www.js
new file mode 100644
index 0000000000000..c2611b4cae68e
--- /dev/null
+++ b/packages/shared/forks/invariant.www.js
@@ -0,0 +1,8 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+export default require('invariant');
diff --git a/packages/shared/forks/invokeGuardedCallback.www.js b/packages/shared/forks/invokeGuardedCallback.www.js
index 3cbe0d6536c9e..c90129f441837 100644
--- a/packages/shared/forks/invokeGuardedCallback.www.js
+++ b/packages/shared/forks/invokeGuardedCallback.www.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 const invokeGuardedCallback = require('ReactFbErrorUtils')
   .invokeGuardedCallback;
diff --git a/packages/shared/forks/warning.www.js b/packages/shared/forks/warning.www.js
new file mode 100644
index 0000000000000..f47643d294685
--- /dev/null
+++ b/packages/shared/forks/warning.www.js
@@ -0,0 +1,8 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+export default require('warning');
diff --git a/packages/shared/invariant.js b/packages/shared/invariant.js
new file mode 100644
index 0000000000000..4cea6d7c73054
--- /dev/null
+++ b/packages/shared/invariant.js
@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+
+/**
+ * Use invariant() to assert state which your program assumes to be true.
+ *
+ * Provide sprintf-style format (only %s is supported) and arguments
+ * to provide information about what broke and what you were
+ * expecting.
+ *
+ * The invariant message will be stripped in production, but the invariant
+ * will remain to ensure logic does not differ in production.
+ */
+
+let validateFormat = () => {};
+
+if (__DEV__) {
+  validateFormat = function(format) {
+    if (format === undefined) {
+      throw new Error('invariant requires an error message argument');
+    }
+  };
+}
+
+export default function invariant(condition, format, a, b, c, d, e, f) {
+  validateFormat(format);
+
+  if (!condition) {
+    let error;
+    if (format === undefined) {
+      error = new Error(
+        'Minified exception occurred; use the non-minified dev environment ' +
+          'for the full error message and additional helpful warnings.',
+      );
+    } else {
+      const args = [a, b, c, d, e, f];
+      let argIndex = 0;
+      error = new Error(
+        format.replace(/%s/g, function() {
+          return args[argIndex++];
+        }),
+      );
+      error.name = 'Invariant Violation';
+    }
+
+    error.framesToPop = 1; // we don't care about invariant's own frame
+    throw error;
+  }
+}
diff --git a/packages/shared/invokeGuardedCallback.js b/packages/shared/invokeGuardedCallback.js
index 6ad3bbc6e0d97..fa6ee451c9193 100644
--- a/packages/shared/invokeGuardedCallback.js
+++ b/packages/shared/invokeGuardedCallback.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 let invokeGuardedCallback = function<A, B, C, D, E, F, Context>(
   name: string | null,
diff --git a/packages/shared/reactProdInvariant.js b/packages/shared/reactProdInvariant.js
index 476e440d543fc..a75c9b106dbf8 100644
--- a/packages/shared/reactProdInvariant.js
+++ b/packages/shared/reactProdInvariant.js
@@ -9,7 +9,7 @@
 
 // Relying on the `invariant()` implementation lets us
 // have preserve the format and params in the www builds.
-import invariant from 'fbjs/lib/invariant';
+import invariant from 'shared/invariant';
 
 /**
  * WARNING: DO NOT manually require this module.
diff --git a/packages/shared/warning.js b/packages/shared/warning.js
new file mode 100644
index 0000000000000..4a8ef4e465c74
--- /dev/null
+++ b/packages/shared/warning.js
@@ -0,0 +1,45 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * Similar to invariant but only logs a warning if the condition is not met.
+ * This can be used to log issues in development environments in critical
+ * paths. Removing the logging code for production environments will keep the
+ * same logic and follow the same code paths.
+ */
+
+let warning = () => {};
+
+if (__DEV__) {
+  const printWarning = function(format, ...args) {
+    let argIndex = 0;
+    const message = 'Warning: ' + format.replace(/%s/g, () => args[argIndex++]);
+    if (typeof console !== 'undefined') {
+      console.error(message);
+    }
+    try {
+      // --- Welcome to debugging React ---
+      // This error was thrown as a convenience so that you can use this stack
+      // to find the callsite that caused this warning to fire.
+      throw new Error(message);
+    } catch (x) {}
+  };
+
+  warning = function(condition, format, ...args) {
+    if (format === undefined) {
+      throw new Error(
+        '`warning(condition, format, ...args)` requires a warning ' +
+          'message argument',
+      );
+    }
+    if (!condition) {
+      printWarning(format, ...args);
+    }
+  };
+}
+
+export default warning;
diff --git a/packages/simple-cache-provider/package.json b/packages/simple-cache-provider/package.json
index f785df0f2eca2..97458201d51df 100644
--- a/packages/simple-cache-provider/package.json
+++ b/packages/simple-cache-provider/package.json
@@ -9,9 +9,6 @@
     "index.js",
     "cjs/"
   ],
-  "dependencies": {
-    "fbjs": "^0.8.16"
-  },
   "peerDependencies": {
     "react": "^16.3.0-alpha.1"
   }
diff --git a/packages/simple-cache-provider/src/SimpleCacheProvider.js b/packages/simple-cache-provider/src/SimpleCacheProvider.js
index b10721bd9f345..13620cced1095 100644
--- a/packages/simple-cache-provider/src/SimpleCacheProvider.js
+++ b/packages/simple-cache-provider/src/SimpleCacheProvider.js
@@ -8,7 +8,7 @@
  */
 
 import React from 'react';
-import warning from 'fbjs/lib/warning';
+import warning from 'shared/warning';
 
 function noop() {}
 
diff --git a/scripts/error-codes/__tests__/replace-invariant-error-codes-test.js b/scripts/error-codes/__tests__/replace-invariant-error-codes-test.js
index fe92a70dbcf9d..c37bef2793b74 100644
--- a/scripts/error-codes/__tests__/replace-invariant-error-codes-test.js
+++ b/scripts/error-codes/__tests__/replace-invariant-error-codes-test.js
@@ -35,10 +35,10 @@ describe('error codes transform', () => {
 
   it('should replace simple invariant calls', () => {
     compare(
-      "import invariant from 'shared/reactProdInvariant';\n" +
+      "import invariant from 'shared/invariant';\n" +
         "invariant(condition, 'Do not override existing functions.');",
       "import _prodInvariant from 'shared/reactProdInvariant';\n" +
-        "import invariant from 'shared/reactProdInvariant';\n" +
+        "import invariant from 'shared/invariant';\n" +
         '!condition ? ' +
         '__DEV__ ? ' +
         "invariant(false, 'Do not override existing functions.') : " +
@@ -54,11 +54,11 @@ describe('error codes transform', () => {
       `_prodInvariant('16') : void 0;`;
 
     compare(
-      `import invariant from 'invariant';
+      `import invariant from 'shared/invariant';
 invariant(condition, 'Do not override existing functions.');
 invariant(condition, 'Do not override existing functions.');`,
       `import _prodInvariant from 'shared/reactProdInvariant';
-import invariant from 'invariant';
+import invariant from 'shared/invariant';
 ${expectedInvariantTransformResult}
 ${expectedInvariantTransformResult}`
     );
@@ -66,10 +66,10 @@ ${expectedInvariantTransformResult}`
 
   it('should support invariant calls with args', () => {
     compare(
-      "import invariant from 'shared/reactProdInvariant';\n" +
+      "import invariant from 'shared/invariant';\n" +
         "invariant(condition, 'Expected %s target to be an array; got %s', 'foo', 'bar');",
       "import _prodInvariant from 'shared/reactProdInvariant';\n" +
-        "import invariant from 'shared/reactProdInvariant';\n" +
+        "import invariant from 'shared/invariant';\n" +
         '!condition ? ' +
         '__DEV__ ? ' +
         "invariant(false, 'Expected %s target to be an array; got %s', 'foo', 'bar') : " +
@@ -79,10 +79,10 @@ ${expectedInvariantTransformResult}`
 
   it('should support invariant calls with a concatenated template string and args', () => {
     compare(
-      "import invariant from 'shared/reactProdInvariant';\n" +
+      "import invariant from 'shared/invariant';\n" +
         "invariant(condition, 'Expected a component class, ' + 'got %s.' + '%s', 'Foo', 'Bar');",
       "import _prodInvariant from 'shared/reactProdInvariant';\n" +
-        "import invariant from 'shared/reactProdInvariant';\n" +
+        "import invariant from 'shared/invariant';\n" +
         '!condition ? ' +
         '__DEV__ ? ' +
         "invariant(false, 'Expected a component class, got %s.%s', 'Foo', 'Bar') : " +
@@ -92,10 +92,10 @@ ${expectedInvariantTransformResult}`
 
   it('should correctly transform invariants that are not in the error codes map', () => {
     compare(
-      "import invariant from 'shared/reactProdInvariant';\n" +
+      "import invariant from 'shared/invariant';\n" +
         "invariant(condition, 'This is not a real error message.');",
       "import _prodInvariant from 'shared/reactProdInvariant';\n" +
-        "import invariant from 'shared/reactProdInvariant';\n" +
+        "import invariant from 'shared/invariant';\n" +
         "!condition ? invariant(false, 'This is not a real error message.') : void 0;"
     );
   });
diff --git a/scripts/release/config.js b/scripts/release/config.js
index e270967cbc00d..e58462c43ac77 100644
--- a/scripts/release/config.js
+++ b/scripts/release/config.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const dependencies = ['fbjs', 'object-assign', 'prop-types'];
+const dependencies = ['object-assign', 'prop-types'];
 
 const paramDefinitions = [
   {
diff --git a/scripts/rollup/build.js b/scripts/rollup/build.js
index cafea350e872d..7b4774506a7a9 100644
--- a/scripts/rollup/build.js
+++ b/scripts/rollup/build.js
@@ -237,6 +237,20 @@ function isProfilingBundleType(bundleType) {
   }
 }
 
+function blacklistFBJS() {
+  return {
+    name: 'blacklistFBJS',
+    resolveId(importee, importer) {
+      if (/^fbjs\//.test(importee)) {
+        throw new Error(
+          `Don't import ${importee} (found in ${importer}). ` +
+            `Use the utilities in packages/shared/ instead.`
+        );
+      }
+    },
+  };
+}
+
 function getPlugins(
   entry,
   externals,
@@ -252,7 +266,7 @@ function getPlugins(
   const forks = Modules.getForks(bundleType, entry, moduleType);
   const isProduction = isProductionBundleType(bundleType);
   const isProfiling = isProfilingBundleType(bundleType);
-  const isInGlobalScope = bundleType === UMD_DEV || bundleType === UMD_PROD;
+  const isUMDBundle = bundleType === UMD_DEV || bundleType === UMD_PROD;
   const isFBBundle = bundleType === FB_WWW_DEV || bundleType === FB_WWW_PROD;
   const isRNBundle =
     bundleType === RN_OSS_DEV ||
@@ -271,6 +285,9 @@ function getPlugins(
     },
     // Shim any modules that need forking in this environment.
     useForks(forks),
+    // Ensure we don't try to bundle any fbjs modules
+    // unless they're transitive (e.g. through prop-types).
+    !isUMDBundle && blacklistFBJS(),
     // Use Node resolution mechanism.
     resolve({
       skip: externals,
@@ -309,7 +326,7 @@ function getPlugins(
         Object.assign({}, closureOptions, {
           // Don't let it create global variables in the browser.
           // https://github.com/facebook/react/issues/10909
-          assume_function_wrapper: !isInGlobalScope,
+          assume_function_wrapper: !isUMDBundle,
           // Works because `google-closure-compiler-js` is forked in Yarn lockfile.
           // We can remove this if GCC merges my PR:
           // https://github.com/google/closure-compiler/pull/2707
diff --git a/scripts/rollup/forks.js b/scripts/rollup/forks.js
index 4c9802b3698d8..64def9eb877ec 100644
--- a/scripts/rollup/forks.js
+++ b/scripts/rollup/forks.js
@@ -91,6 +91,17 @@ const forks = Object.freeze({
     }
   },
 
+  // This logic is forked on www to fork the formatting function.
+  'shared/invariant': (bundleType, entry) => {
+    switch (bundleType) {
+      case FB_WWW_DEV:
+      case FB_WWW_PROD:
+        return 'shared/forks/invariant.www.js';
+      default:
+        return null;
+    }
+  },
+
   // This logic is forked on www to blacklist warnings.
   'shared/lowPriorityWarning': (bundleType, entry) => {
     switch (bundleType) {
@@ -102,6 +113,17 @@ const forks = Object.freeze({
     }
   },
 
+  // This logic is forked on www to blacklist warnings.
+  'shared/warning': (bundleType, entry) => {
+    switch (bundleType) {
+      case FB_WWW_DEV:
+      case FB_WWW_PROD:
+        return 'shared/forks/warning.www.js';
+      default:
+        return null;
+    }
+  },
+
   // In FB bundles, we preserve an inline require to ReactCurrentOwner.
   // See the explanation in FB version of ReactCurrentOwner in www:
   'react/src/ReactCurrentOwner': (bundleType, entry) => {
diff --git a/scripts/rollup/modules.js b/scripts/rollup/modules.js
index 598d7aa85e450..f814bc195e83f 100644
--- a/scripts/rollup/modules.js
+++ b/scripts/rollup/modules.js
@@ -12,11 +12,7 @@ const UMD_PROD = bundleTypes.UMD_PROD;
 const HAS_NO_SIDE_EFFECTS_ON_IMPORT = false;
 // const HAS_SIDE_EFFECTS_ON_IMPORT = true;
 const importSideEffects = Object.freeze({
-  'fbjs/lib/invariant': HAS_NO_SIDE_EFFECTS_ON_IMPORT,
-  'fbjs/lib/warning': HAS_NO_SIDE_EFFECTS_ON_IMPORT,
   'prop-types/checkPropTypes': HAS_NO_SIDE_EFFECTS_ON_IMPORT,
-  'fbjs/lib/camelizeStyleName': HAS_NO_SIDE_EFFECTS_ON_IMPORT,
-  'fbjs/lib/hyphenateStyleName': HAS_NO_SIDE_EFFECTS_ON_IMPORT,
   deepFreezeAndThrowOnMutationInDev: HAS_NO_SIDE_EFFECTS_ON_IMPORT,
 });