From 8dc1902f2f655e26fe86647ea2cb444db69dd694 Mon Sep 17 00:00:00 2001
From: Connor Davis <mail@connordav.is>
Date: Sat, 1 Dec 2018 15:38:06 -0600
Subject: [PATCH] Add className option

---
 packages/react-error-overlay/src/index.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/react-error-overlay/src/index.js b/packages/react-error-overlay/src/index.js
index e8fbbb0dfad..511d0b13245 100644
--- a/packages/react-error-overlay/src/index.js
+++ b/packages/react-error-overlay/src/index.js
@@ -24,6 +24,7 @@ import type { ErrorLocation } from './utils/parseCompileError';
 type RuntimeReportingOptions = {|
   onError: () => void,
   filename?: string,
+  className?: string,
 |};
 
 type EditorHandler = (errorLoc: ErrorLocation) => void;
@@ -138,7 +139,13 @@ function update() {
   // We need to schedule the first render.
   isLoadingIframe = true;
   const loadingIframe = window.document.createElement('iframe');
-  applyStyles(loadingIframe, iframeStyle);
+
+  if (currentRuntimeErrorOptions && currentRuntimeErrorOptions.className) {
+    loadingIframe.className = currentRuntimeErrorOptions.className;
+  } else {
+    applyStyles(loadingIframe, iframeStyle);
+  }
+
   loadingIframe.onload = function() {
     const iframeDocument = loadingIframe.contentDocument;
     if (iframeDocument != null && iframeDocument.body != null) {