From 50393dc3a0c59cfefd349d31992256efd6f8c261 Mon Sep 17 00:00:00 2001
From: Brian Vaughn <bvaughn@fb.com>
Date: Tue, 22 Dec 2020 10:58:47 -0800
Subject: [PATCH] React Native fixes for new inline errors feature (#20502)

---
 .../src/__tests__/inspectedElementContext-test.js   |  3 ++-
 .../react-devtools-shared/src/backend/console.js    | 13 +++++--------
 .../react-devtools-shared/src/backend/renderer.js   |  2 +-
 packages/react-devtools-shared/src/hook.js          |  2 +-
 4 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/packages/react-devtools-shared/src/__tests__/inspectedElementContext-test.js b/packages/react-devtools-shared/src/__tests__/inspectedElementContext-test.js
index 153bb43801ba2..c60560302f55f 100644
--- a/packages/react-devtools-shared/src/__tests__/inspectedElementContext-test.js
+++ b/packages/react-devtools-shared/src/__tests__/inspectedElementContext-test.js
@@ -2014,7 +2014,8 @@ describe('InspectedElementContext', () => {
         Object {
           "errors": Array [
             Array [
-              "Warning: Each child in a list should have a unique \\"key\\" prop. See https://reactjs.org/link/warning-keys for more information.",
+              "Warning: Each child in a list should have a unique \\"key\\" prop. See https://reactjs.org/link/warning-keys for more information.
+            at Example",
               1,
             ],
           ],
diff --git a/packages/react-devtools-shared/src/backend/console.js b/packages/react-devtools-shared/src/backend/console.js
index cc9eff11f6841..ee06d2173eabf 100644
--- a/packages/react-devtools-shared/src/backend/console.js
+++ b/packages/react-devtools-shared/src/backend/console.js
@@ -140,12 +140,12 @@ export function patch({
         targetConsole[method]);
 
       const overrideMethod = (...args) => {
-        const lastArg = args.length > 0 ? args[args.length - 1] : null;
-        const alreadyHasComponentStack =
-          lastArg !== null && isStringComponentStack(lastArg);
-
         let shouldAppendWarningStack = false;
         if (consoleSettingsRef.appendComponentStack) {
+          const lastArg = args.length > 0 ? args[args.length - 1] : null;
+          const alreadyHasComponentStack =
+            lastArg !== null && isStringComponentStack(lastArg);
+
           // If we are ever called with a string that already has a component stack,
           // e.g. a React error/warning, don't append a second stack.
           shouldAppendWarningStack = !alreadyHasComponentStack;
@@ -176,10 +176,7 @@ export function patch({
                       current,
                       ((method: any): 'error' | 'warn'),
                       // Copy args before we mutate them (e.g. adding the component stack)
-                      alreadyHasComponentStack
-                        ? // Replace component stack with an empty string in case there's a string placeholder for it.
-                          [...args.slice(0, -1), '']
-                        : args.slice(),
+                      args.slice(),
                     );
                   }
                 }
diff --git a/packages/react-devtools-shared/src/backend/renderer.js b/packages/react-devtools-shared/src/backend/renderer.js
index 11beef37f76d4..e44b58f71009e 100644
--- a/packages/react-devtools-shared/src/backend/renderer.js
+++ b/packages/react-devtools-shared/src/backend/renderer.js
@@ -634,7 +634,7 @@ export function attach(
     const breakOnConsoleErrors =
       window.__REACT_DEVTOOLS_BREAK_ON_CONSOLE_ERRORS__ === true;
     const showInlineWarningsAndErrors =
-      window.__REACT_DEVTOOLS_SHOW_INLINE_WARNINGS_AND_ERRORS__ === true;
+      window.__REACT_DEVTOOLS_SHOW_INLINE_WARNINGS_AND_ERRORS__ !== false;
     if (appendComponentStack || breakOnConsoleErrors) {
       patchConsole({
         appendComponentStack,
diff --git a/packages/react-devtools-shared/src/hook.js b/packages/react-devtools-shared/src/hook.js
index 9bec6f40a1537..3bb2eb23115ab 100644
--- a/packages/react-devtools-shared/src/hook.js
+++ b/packages/react-devtools-shared/src/hook.js
@@ -183,7 +183,7 @@ export function installHook(target: any): DevToolsHook | null {
         const breakOnConsoleErrors =
           window.__REACT_DEVTOOLS_BREAK_ON_CONSOLE_ERRORS__ === true;
         const showInlineWarningsAndErrors =
-          window.__REACT_DEVTOOLS_SHOW_INLINE_WARNINGS_AND_ERRORS__ === true;
+          window.__REACT_DEVTOOLS_SHOW_INLINE_WARNINGS_AND_ERRORS__ !== false;
 
         // The installHook() function is injected by being stringified in the browser,
         // so imports outside of this function do not get included.