diff --git a/src/renderers/shared/fiber/ReactChildFiber.js b/src/renderers/shared/fiber/ReactChildFiber.js
index 68d4f7b39cffc..57e28cb02f733 100644
--- a/src/renderers/shared/fiber/ReactChildFiber.js
+++ b/src/renderers/shared/fiber/ReactChildFiber.js
@@ -72,9 +72,6 @@ const {
   Deletion,
 } = ReactTypeOfSideEffect;
 
-const internalErrorMessage =
-  'This error is likely caused by a bug in React. Please file an issue.';
-
 function coerceRef(current: ?Fiber, element: ReactElement) {
   let mixedRef = element.ref;
   if (mixedRef != null && typeof mixedRef !== 'function') {
@@ -92,9 +89,10 @@ function coerceRef(current: ?Fiber, element: ReactElement) {
         }
       }
       invariant(
-        inst, 'Missing owner for string ref %s. (%s)',
-        mixedRef,
-        internalErrorMessage
+        inst,
+        'Missing owner for string ref %s. This error is likely caused by a ' +
+        'bug in React. Please file an issue.',
+        mixedRef
       );
       const stringRef = String(mixedRef);
       // Check if previous string ref matches new string ref
@@ -806,8 +804,8 @@ function ChildReconciler(shouldClone, shouldTrackSideEffects) {
     const iteratorFn = getIteratorFn(newChildrenIterable);
     invariant(
       typeof iteratorFn === 'function',
-      'An object is not an iterable. (%s)',
-      internalErrorMessage
+      'An object is not an iterable. This error is likely caused by a bug in ' +
+      'React. Please file an issue.'
     );
 
     if (__DEV__) {
diff --git a/src/renderers/shared/fiber/ReactFiberBeginWork.js b/src/renderers/shared/fiber/ReactFiberBeginWork.js
index 38eb56ca0b587..947ba6ed24ee8 100644
--- a/src/renderers/shared/fiber/ReactFiberBeginWork.js
+++ b/src/renderers/shared/fiber/ReactFiberBeginWork.js
@@ -71,9 +71,6 @@ if (__DEV__) {
   var warnedAboutStatelessRefs = {};
 }
 
-const internalErrorMessage =
-  'This error is likely caused by a bug in React. Please file an issue.';
-
 module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   config : HostConfig<T, P, I, TI, PI, C, CX, PL>,
   hostContext : HostContext<C, CX>,
@@ -347,8 +344,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
         nextProps = memoizedProps;
         invariant(
           nextProps !== null,
-          'We should always have pending or current props. (%s)',
-          internalErrorMessage
+          'We should always have pending or current props. This error is ' +
+          'likely caused by a bug in React. Please file an issue.'
         );
       }
     } else if (nextProps === null || memoizedProps === nextProps) {
@@ -450,8 +447,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   function mountIndeterminateComponent(current, workInProgress, priorityLevel) {
     invariant(
       current === null,
-      'An indeterminate component should never have mounted. (%s)',
-      internalErrorMessage
+      'An indeterminate component should never have mounted. This error is ' +
+      'likely caused by a bug in React. Please file an issue.'
     );
     var fn = workInProgress.type;
     var props = workInProgress.pendingProps;
@@ -521,8 +518,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
         nextCoroutine = current && current.memoizedProps;
         invariant(
           nextCoroutine != null,
-          'We should always have pending or current props. (%s)',
-          internalErrorMessage
+          'We should always have pending or current props. This error is ' +
+          'likely caused by a bug in React. Please file an issue.'
         );
       }
     } else if (nextCoroutine === null || workInProgress.memoizedProps === nextCoroutine) {
@@ -587,8 +584,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
         nextChildren = current && current.memoizedProps;
         invariant(
           nextChildren != null,
-          'We should always have pending or current props. (%s)',
-          internalErrorMessage
+          'We should always have pending or current props. This error is ' +
+          'likely caused by a bug in React. Please file an issue.'
         );
       }
     } else if (nextChildren === null || workInProgress.memoizedProps === nextChildren) {
@@ -741,8 +738,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
       default:
         invariant(
           false,
-          'Unknown unit of work tag. (%s)',
-          internalErrorMessage
+          'Unknown unit of work tag. This error is likely caused by a bug in ' +
+          'React. Please file an issue.'
         );
     }
   }
@@ -751,8 +748,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     invariant(
       workInProgress.tag === ClassComponent ||
       workInProgress.tag === HostRoot,
-      'Invalid type of work. (%s)',
-      internalErrorMessage
+      'Invalid type of work. This error is likely caused by a bug in React. ' +
+      'Please file an issue.'
     );
 
     // Add an error effect so we can handle the error during the commit phase
diff --git a/src/renderers/shared/fiber/ReactFiberClassComponent.js b/src/renderers/shared/fiber/ReactFiberClassComponent.js
index d4f7d1f5391b0..d135b23531c24 100644
--- a/src/renderers/shared/fiber/ReactFiberClassComponent.js
+++ b/src/renderers/shared/fiber/ReactFiberClassComponent.js
@@ -40,9 +40,6 @@ var invariant = require('invariant');
 
 const isArray = Array.isArray;
 
-const internalErrorMessage =
-  'This error is likely caused by a bug in React. Please file an issue.';
-
 module.exports = function(
   scheduleUpdate : (fiber : Fiber, priorityLevel : PriorityLevel) => void,
   getPriorityContext : () => PriorityLevel,
@@ -262,8 +259,8 @@ module.exports = function(
     let props = workInProgress.pendingProps;
     invariant(
       props,
-      'There must be pending props for an initial mount. (%s)',
-      internalErrorMessage
+      'There must be pending props for an initial mount. This error is ' +
+      'likely caused by a bug in React. Please file an issue.'
     );
 
     const unmaskedContext = getUnmaskedContext(workInProgress);
@@ -305,8 +302,8 @@ module.exports = function(
       newProps = workInProgress.memoizedProps;
       invariant(
         newProps != null,
-        'There should always be pending or memoized props. (%s)',
-        internalErrorMessage
+        'There should always be pending or memoized props. This error is ' +
+        'likely caused by a bug in React. Please file an issue.'
       );
     }
     const newUnmaskedContext = getUnmaskedContext(workInProgress);
@@ -372,8 +369,8 @@ module.exports = function(
       newProps = oldProps;
       invariant(
         newProps != null,
-        'There should always be pending or memoized props. (%s)',
-        internalErrorMessage
+        'There should always be pending or memoized props. This error is ' +
+        'likely caused by a bug in React. Please file an issue.'
       );
     }
     const oldContext = instance.context;
diff --git a/src/renderers/shared/fiber/ReactFiberCommitWork.js b/src/renderers/shared/fiber/ReactFiberCommitWork.js
index dd72e78d241f4..072c482355a51 100644
--- a/src/renderers/shared/fiber/ReactFiberCommitWork.js
+++ b/src/renderers/shared/fiber/ReactFiberCommitWork.js
@@ -36,9 +36,6 @@ var {
 
 var invariant = require('invariant');
 
-const internalErrorMessage =
-  'This error is likely caused by a bug in React. Please file an issue.';
-
 module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   config : HostConfig<T, P, I, TI, PI, C, CX, PL>,
   captureError : (failedFiber : Fiber, error: Error) => ?Fiber
@@ -101,8 +98,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     }
     invariant(
       false,
-      'Expected to find a host parent. (%s)',
-      internalErrorMessage
+      'Expected to find a host parent. This error is likely caused by a bug ' +
+      'in React. Please file an issue.'
     );
   }
 
@@ -116,8 +113,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     }
     invariant(
       false,
-      'Expected to find a host parent. (%s)',
-      internalErrorMessage
+      'Expected to find a host parent. This error is likely caused by a bug ' +
+      'in React. Please file an issue.'
     );
   }
 
@@ -188,8 +185,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
       default:
         invariant(
           false,
-          'Invalid host parent fiber. (%s)',
-          internalErrorMessage
+          'Invalid host parent fiber. This error is likely caused by a bug ' +
+          'in React. Please file an issue.'
         );
     }
     if (parentFiber.effectTag & ContentReset) {
@@ -393,8 +390,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
       case HostText: {
         invariant(
           finishedWork.stateNode !== null && current != null,
-          'This should only be done during updates. (%s)',
-          internalErrorMessage
+          'This should only be done during updates. This error is likely ' +
+          'caused by a bug in React. Please file an issue.'
         );
         const textInstance : TI = finishedWork.stateNode;
         const newText : string = finishedWork.memoizedProps;
@@ -411,8 +408,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
       default: {
         invariant(
           false,
-          'This unit of work tag should not have side-effects. (%s)',
-          internalErrorMessage
+          'This unit of work tag should not have side-effects. This error is ' +
+          'likely caused by a bug in React. Please file an issue.'
         );
       }
     }
@@ -477,8 +474,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
       default: {
         invariant(
           false,
-          'This unit of work tag should not have side-effects. (%s)',
-          internalErrorMessage
+          'This unit of work tag should not have side-effects. This error is ' +
+          'likely caused by a bug in React. Please file an issue.'
         );
       }
     }
diff --git a/src/renderers/shared/fiber/ReactFiberCompleteWork.js b/src/renderers/shared/fiber/ReactFiberCompleteWork.js
index a3e8fa397baad..a8c8137f9a5c8 100644
--- a/src/renderers/shared/fiber/ReactFiberCompleteWork.js
+++ b/src/renderers/shared/fiber/ReactFiberCompleteWork.js
@@ -48,9 +48,6 @@ if (__DEV__) {
 
 var invariant = require('invariant');
 
-const internalErrorMessage =
-  'This error is likely caused by a bug in React. Please file an issue.';
-
 module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   config : HostConfig<T, P, I, TI, PI, C, CX, PL>,
   hostContext : HostContext<C, CX>,
@@ -122,8 +119,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     var coroutine = (workInProgress.memoizedProps : ?ReactCoroutine);
     invariant(
       coroutine,
-      'Should be resolved by now. (%s)',
-      internalErrorMessage
+      'Should be resolved by now. This error is likely caused by a bug in ' +
+      'React. Please file an issue.',
     );
 
     // First step of the coroutine has completed. Now we need to do the second.
@@ -241,8 +238,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
           if (!newProps) {
             invariant(
               workInProgress.stateNode !== null,
-              'We must have new props for new mounts. (%s)',
-              internalErrorMessage
+              'We must have new props for new mounts. This error is likely ' +
+              'caused by a bug in React. Please file an issue.'
             );
             // This can happen when we abort work.
             return null;
@@ -291,8 +288,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
           if (typeof newText !== 'string') {
             invariant(
               workInProgress.stateNode !== null,
-              'We must have new props for new mounts. (%s)',
-              internalErrorMessage
+              'We must have new props for new mounts. This error is likely ' +
+              'caused by a bug in React. Please file an issue.'
             );
             // This can happen when we abort work.
             return null;
@@ -325,15 +322,16 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
       case IndeterminateComponent:
         invariant(
           false,
-          'An indeterminate component should have become determinate before completing. (%s)',
-          internalErrorMessage
+          'An indeterminate component should have become determinate before ' +
+          'completing. This error is likely caused by a bug in React. Please ' +
+          'file an issue.'
         );
         // eslint-disable-next-line no-fallthrough
       default:
         invariant(
           false,
-          'Unknown unit of work tag. (%s)',
-          internalErrorMessage
+          'Unknown unit of work tag. This error is likely caused by a bug in ' +
+          'React. Please file an issue.'
         );
     }
   }
diff --git a/src/renderers/shared/fiber/ReactFiberHostContext.js b/src/renderers/shared/fiber/ReactFiberHostContext.js
index 69c4bb24bdeeb..8abbc538d74c0 100644
--- a/src/renderers/shared/fiber/ReactFiberHostContext.js
+++ b/src/renderers/shared/fiber/ReactFiberHostContext.js
@@ -36,9 +36,6 @@ export type HostContext<C, CX> = {
   resetHostContainer() : void,
 };
 
-const internalErrorMessage =
-  'This error is likely caused by a bug in React. Please file an issue.';
-
 module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   config : HostConfig<T, P, I, TI, PI, C, CX, PL>
 ) : HostContext<C, CX> {
@@ -55,8 +52,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     const rootInstance = rootInstanceStackCursor.current;
     invariant(
       rootInstance != null,
-      'Expected root container to exist. (%s)',
-      internalErrorMessage
+      'Expected root container to exist. This error is likely caused by a ' +
+      'bug in React. Please file an issue.'
     );
     return rootInstance;
   }
@@ -84,8 +81,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     const context = contextStackCursor.current;
     invariant(
       context != null,
-      'Expected host context to exist. (%s)',
-      internalErrorMessage
+      'Expected host context to exist. This error is likely caused by a bug ' +
+      'in React. Please file an issue.'
     );
     return context;
   }
@@ -94,8 +91,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     const rootInstance = rootInstanceStackCursor.current;
     invariant(
       rootInstance != null,
-      'Expected root host context to exist. (%s)',
-      internalErrorMessage
+      'Expected root host context to exist. This error is likely caused by ' +
+      'a bug in React. Please file an issue.'
     );
 
     const context = contextStackCursor.current || emptyObject;
diff --git a/src/renderers/shared/fiber/ReactFiberScheduler.js b/src/renderers/shared/fiber/ReactFiberScheduler.js
index 41dd8d6152d29..d070cf4de40a8 100644
--- a/src/renderers/shared/fiber/ReactFiberScheduler.js
+++ b/src/renderers/shared/fiber/ReactFiberScheduler.js
@@ -92,9 +92,6 @@ if (__DEV__) {
 
 var timeHeuristicForUnitOfWork = 1;
 
-const internalErrorMessage =
-  'This error is likely caused by a bug in React. Please file an issue.';
-
 module.exports = function<T, P, I, TI, PI, C, CX, PL>(config : HostConfig<T, P, I, TI, PI, C, CX, PL>) {
   const hostContext = ReactFiberHostContext(config);
   const { popHostContainer, popHostContext, resetHostContainer } = hostContext;
@@ -348,8 +345,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(config : HostConfig<T, P,
     invariant(
       root.current !== finishedWork,
       'Cannot commit the same tree as before. This is probably a bug ' +
-      'related to the return field. (%s)',
-      internalErrorMessage
+      'related to the return field. This error is likely caused by a bug ' +
+      'in React. Please file an issue.'
     );
 
     // Updates that occur during the commit phase should have Task priority
@@ -385,8 +382,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(config : HostConfig<T, P,
       } catch (error) {
         invariant(
           nextEffect != null,
-          'Should have next effect. (%s)',
-          internalErrorMessage
+          'Should have next effect. This error is likely caused by a bug ' +
+          'in React. Please file an issue.'
         );
         captureError(nextEffect, error);
         // Clean-up
@@ -415,8 +412,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(config : HostConfig<T, P,
       } catch (error) {
         invariant(
           nextEffect != null,
-          'Should have next effect. (%s)',
-          internalErrorMessage
+          'Should have next effect. This error is likely caused by a bug ' +
+          'in React. Please file an issue.'
         );
         captureError(nextEffect, error);
         if (nextEffect) {
@@ -716,8 +713,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(config : HostConfig<T, P,
   function performWork(priorityLevel : PriorityLevel, deadline : Deadline | null) {
     invariant(
       !isPerformingWork,
-      'performWork was called recursively. (%s)',
-      internalErrorMessage
+      'performWork was called recursively. This error is likely caused ' +
+      'by a bug in React. Please file an issue.'
     );
     isPerformingWork = true;
     const isPerformingDeferredWork = Boolean(deadline);
@@ -729,8 +726,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(config : HostConfig<T, P,
     while (priorityLevel !== NoWork && !fatalError) {
       invariant(
         deadline || (priorityLevel < HighPriority),
-        'Cannot perform deferred work without a deadline. (%s)',
-        internalErrorMessage
+        'Cannot perform deferred work without a deadline. This error is ' +
+        'likely caused by a bug in React. Please file an issue.'
       );
 
       // Before starting any work, check to see if there are any pending
@@ -1001,8 +998,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(config : HostConfig<T, P,
 
     invariant(
       capturedError != null,
-      'No error for given unit of work. (%s)',
-      internalErrorMessage
+      'No error for given unit of work. This error is likely caused by a ' +
+      'bug in React. Please file an issue.'
     );
 
     let error;
@@ -1038,8 +1035,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(config : HostConfig<T, P,
       default:
         invariant(
           false,
-          'Invalid type of work. (%s)',
-          internalErrorMessage
+          'Invalid type of work. This error is likely caused by a bug in ' +
+          'React. Please file an issue.'
         );
     }
   }