diff --git a/packages/react-error-overlay/src/index.js b/packages/react-error-overlay/src/index.js
index 86b82a853fe..e8fbbb0dfad 100644
--- a/packages/react-error-overlay/src/index.js
+++ b/packages/react-error-overlay/src/index.js
@@ -6,7 +6,10 @@
  */
 
 /* @flow */
-import { listenToRuntimeErrors } from './listenToRuntimeErrors';
+import {
+  listenToRuntimeErrors,
+  crashWithFrames,
+} from './listenToRuntimeErrors';
 import { iframeStyle } from './styles';
 import { applyStyles } from './utils/dom/css';
 
@@ -47,6 +50,14 @@ export function reportBuildError(error: string) {
   update();
 }
 
+export function reportRuntimeError(
+  error: Error,
+  options?: RuntimeReportingOption = {}
+) {
+  currentRuntimeErrorOptions = options;
+  crashWithFrames(handleRuntimeError(options))(error);
+}
+
 export function dismissBuildError() {
   currentBuildError = null;
   update();
@@ -64,28 +75,35 @@ export function startReportingRuntimeErrors(options: RuntimeReportingOptions) {
     );
   }
   currentRuntimeErrorOptions = options;
-  stopListeningToRuntimeErrors = listenToRuntimeErrors(errorRecord => {
-    try {
-      if (typeof options.onError === 'function') {
-        options.onError.call(null);
-      }
-    } finally {
-      handleRuntimeError(errorRecord);
-    }
-  }, options.filename);
+  stopListeningToRuntimeErrors = listenToRuntimeErrors(
+    handleRuntimeError(options),
+    options.filename
+  );
 }
 
-function handleRuntimeError(errorRecord) {
-  if (
-    currentRuntimeErrorRecords.some(({ error }) => error === errorRecord.error)
-  ) {
-    // Deduplicate identical errors.
-    // This fixes https://github.com/facebook/create-react-app/issues/3011.
-    return;
+const handleRuntimeError = (options: RuntimeReportingOptions) => (
+  errorRecord: ErrorRecord
+) => {
+  try {
+    if (typeof options.onError === 'function') {
+      options.onError.call(null);
+    }
+  } finally {
+    if (
+      currentRuntimeErrorRecords.some(
+        ({ error }) => error === errorRecord.error
+      )
+    ) {
+      // Deduplicate identical errors.
+      // This fixes https://github.com/facebook/create-react-app/issues/3011.
+      return;
+    }
+    currentRuntimeErrorRecords = currentRuntimeErrorRecords.concat([
+      errorRecord,
+    ]);
+    update();
   }
-  currentRuntimeErrorRecords = currentRuntimeErrorRecords.concat([errorRecord]);
-  update();
-}
+};
 
 export function dismissRuntimeErrors() {
   currentRuntimeErrorRecords = [];
diff --git a/packages/react-error-overlay/src/listenToRuntimeErrors.js b/packages/react-error-overlay/src/listenToRuntimeErrors.js
index 8146b377c15..670dbb0f8e4 100644
--- a/packages/react-error-overlay/src/listenToRuntimeErrors.js
+++ b/packages/react-error-overlay/src/listenToRuntimeErrors.js
@@ -37,34 +37,40 @@ export type ErrorRecord = {|
   stackFrames: StackFrame[],
 |};
 
+export const crashWithFrames = (crash: ErrorRecord => void) => (
+  error: Error,
+  unhandledRejection = false
+) => {
+  getStackFrames(error, unhandledRejection, CONTEXT_SIZE)
+    .then(stackFrames => {
+      if (stackFrames == null) {
+        return;
+      }
+      crash({
+        error,
+        unhandledRejection,
+        contextSize: CONTEXT_SIZE,
+        stackFrames,
+      });
+    })
+    .catch(e => {
+      console.log('Could not get the stack frames of error:', e);
+    });
+};
+
 export function listenToRuntimeErrors(
   crash: ErrorRecord => void,
   filename: string = '/static/js/bundle.js'
 ) {
-  function crashWithFrames(error: Error, unhandledRejection = false) {
-    getStackFrames(error, unhandledRejection, CONTEXT_SIZE)
-      .then(stackFrames => {
-        if (stackFrames == null) {
-          return;
-        }
-        crash({
-          error,
-          unhandledRejection,
-          contextSize: CONTEXT_SIZE,
-          stackFrames,
-        });
-      })
-      .catch(e => {
-        console.log('Could not get the stack frames of error:', e);
-      });
-  }
-  registerError(window, error => crashWithFrames(error, false));
-  registerPromise(window, error => crashWithFrames(error, true));
+  const crashWithFramesRunTime = crashWithFrames(crash);
+
+  registerError(window, error => crashWithFramesRunTime(error, false));
+  registerPromise(window, error => crashWithFramesRunTime(error, true));
   registerStackTraceLimit();
   registerReactStack();
   permanentRegisterConsole('error', (warning, stack) => {
     const data = massageWarning(warning, stack);
-    crashWithFrames(
+    crashWithFramesRunTime(
       // $FlowFixMe
       {
         message: data.message,