chore[react-devtools/backend]: remove consoleManagedByDevToolsDuringStrictMode (#29856)

## Summary

Removes the usage of `consoleManagedByDevToolsDuringStrictMode` flag
from React DevTools backend, this is the only place in RDT where this
flag was used. The only remaining part is
[`ReactFiberDevToolsHook`](6708115937/packages/react-reconciler/src/ReactFiberDevToolsHook.js (L203)),
so React renderers can start notifying DevTools when `render` runs in a
Strict Mode.

> TL;DR: it is broken, and we already incorrectly apply dimming, when
RDT frontend is not opened. Fixing in the next few changes, see next
steps.

Before explaining why I am removing this, some context is required. The
way RDT works is slightly different, based on the fact if RDT frontend
and RDT backend are actually connected:
1. For browser extension case, the Backend is a script, which is
injected by the extension when page is loaded and before React is
loaded. RDT Frontend is loaded together with the RDT panel in browser
DevTools, so ONLY when user actually opens the RDT panel.
2. For native case, RDT backend is shipped together with `react-native`
for DEV bundles. It is always injected before React is loaded. RDT
frontend is loaded only when user starts a standalone RDT app via `npx
react-devtools` or by opening React Native DevTools and then selecting
React DevTools panel.

When Frontend is not connected to the Backend, the only thing we have is
the `__REACT_DEVTOOLS_GLOBAL_HOOK__` — this thing inlines some APIs in
itself, so that it can work similarly when RDT Frontend is not even
opened. This is especially important for console logs, since they are
cached and stored, then later displayed to the user once the Console
panel is opened, but from RDT side, you want to modify these console
logs when they are emitted.

In order to do so, we [inline the console patching logic into the
hook](3ac551e855/packages/react-devtools-shared/src/hook.js (L222-L319)).
This implementation doesn't use the
`consoleManagedByDevToolsDuringStrictMode`. This means that if we enable
`consoleManagedByDevToolsDuringStrictMode` for Native right now, users
would see broken dimming in LogBox / Metro logs when RDT Frontend is not
opened.

Next steps:
1. Align this console patching implementation with the one in `hook.js`.
2. Make LogBox compatible with console stylings: both css and ASCII
escape symbols.
3. Ship new version of RDT with these changes.
4. Remove `consoleManagedByDevToolsDuringStrictMode` from
`ReactFiberDevToolsHook`, so this is rolled out for all renderers.

packages/react-devtools-shared/src/backend/console.js

@@ -22,7 +22,6 @@ import {
   getStackByFiberInDevAndProd,
   supportsNativeConsoleTasks,
 } from './DevToolsFiberComponentStack';
-import {consoleManagedByDevToolsDuringStrictMode} from 'react-devtools-feature-flags';
 import {castBool, castBrowserTheme} from '../utils';
 
 const OVERRIDE_CONSOLE_METHODS = ['error', 'trace', 'warn'];
@@ -302,76 +301,72 @@ let unpatchForStrictModeFn: null | (() => void) = null;
 
 // NOTE: KEEP IN SYNC with src/hook.js:patchConsoleForInitialCommitInStrictMode
 export function patchForStrictMode() {
-  if (consoleManagedByDevToolsDuringStrictMode) {
-    const overrideConsoleMethods = [
-      'error',
-      'group',
-      'groupCollapsed',
-      'info',
-      'log',
-      'trace',
-      'warn',
-    ];
+  const overrideConsoleMethods = [
+    'error',
+    'group',
+    'groupCollapsed',
+    'info',
+    'log',
+    'trace',
+    'warn',
+  ];
 
-    if (unpatchForStrictModeFn !== null) {
-      // Don't patch twice.
-      return;
-    }
+  if (unpatchForStrictModeFn !== null) {
+    // Don't patch twice.
+    return;
+  }
 
-    const originalConsoleMethods: {[string]: $FlowFixMe} = {};
+  const originalConsoleMethods: {[string]: $FlowFixMe} = {};
 
-    unpatchForStrictModeFn = () => {
-      for (const method in originalConsoleMethods) {
-        try {
-          targetConsole[method] = originalConsoleMethods[method];
-        } catch (error) {}
-      }
-    };
-
-    overrideConsoleMethods.forEach(method => {
+  unpatchForStrictModeFn = () => {
+    for (const method in originalConsoleMethods) {
       try {
-        const originalMethod = (originalConsoleMethods[method] = targetConsole[
-          method
-        ].__REACT_DEVTOOLS_STRICT_MODE_ORIGINAL_METHOD__
-          ? targetConsole[method].__REACT_DEVTOOLS_STRICT_MODE_ORIGINAL_METHOD__
-          : targetConsole[method]);
+        targetConsole[method] = originalConsoleMethods[method];
+      } catch (error) {}
+    }
+  };
 
-        // $FlowFixMe[missing-local-annot]
-        const overrideMethod = (...args) => {
-          if (!consoleSettingsRef.hideConsoleLogsInStrictMode) {
-            // Dim the text color of the double logs if we're not
-            // hiding them.
-            if (isNode) {
-              originalMethod(DIMMED_NODE_CONSOLE_COLOR, format(...args));
+  overrideConsoleMethods.forEach(method => {
+    try {
+      const originalMethod = (originalConsoleMethods[method] = targetConsole[
+        method
+      ].__REACT_DEVTOOLS_STRICT_MODE_ORIGINAL_METHOD__
+        ? targetConsole[method].__REACT_DEVTOOLS_STRICT_MODE_ORIGINAL_METHOD__
+        : targetConsole[method]);
+
+      // $FlowFixMe[missing-local-annot]
+      const overrideMethod = (...args) => {
+        if (!consoleSettingsRef.hideConsoleLogsInStrictMode) {
+          // Dim the text color of the double logs if we're not
+          // hiding them.
+          if (isNode) {
+            originalMethod(DIMMED_NODE_CONSOLE_COLOR, format(...args));
+          } else {
+            const color = getConsoleColor(method);
+            if (color) {
+              originalMethod(...formatWithStyles(args, `color: ${color}`));
             } else {
-              const color = getConsoleColor(method);
-              if (color) {
-                originalMethod(...formatWithStyles(args, `color: ${color}`));
-              } else {
-                throw Error('Console color is not defined');
-              }
+              throw Error('Console color is not defined');
             }
           }
-        };
+        }
+      };
 
-        overrideMethod.__REACT_DEVTOOLS_STRICT_MODE_ORIGINAL_METHOD__ =
-          originalMethod;
-        originalMethod.__REACT_DEVTOOLS_STRICT_MODE_OVERRIDE_METHOD__ =
-          overrideMethod;
+      overrideMethod.__REACT_DEVTOOLS_STRICT_MODE_ORIGINAL_METHOD__ =
+        originalMethod;
+      originalMethod.__REACT_DEVTOOLS_STRICT_MODE_OVERRIDE_METHOD__ =
+        overrideMethod;
 
-        targetConsole[method] = overrideMethod;
-      } catch (error) {}
-    });
-  }
+      targetConsole[method] = overrideMethod;
+    } catch (error) {}
+  });
 }
 
 // NOTE: KEEP IN SYNC with src/hook.js:unpatchConsoleForInitialCommitInStrictMode
 export function unpatchForStrictMode(): void {
-  if (consoleManagedByDevToolsDuringStrictMode) {
-    if (unpatchForStrictModeFn !== null) {
-      unpatchForStrictModeFn();
-      unpatchForStrictModeFn = null;
-    }
+  if (unpatchForStrictModeFn !== null) {
+    unpatchForStrictModeFn();
+    unpatchForStrictModeFn = null;
   }
 }
 

packages/react-devtools-shared/src/config/DevToolsFeatureFlags.core-fb.js

@@ -13,7 +13,6 @@
  * It should always be imported from "react-devtools-feature-flags".
  ************************************************************************/
 
-export const consoleManagedByDevToolsDuringStrictMode = false;
 export const enableLogger = true;
 export const enableStyleXFeatures = true;
 export const isInternalFacebookBuild = true;

packages/react-devtools-shared/src/config/DevToolsFeatureFlags.core-oss.js

@@ -13,7 +13,6 @@
  * It should always be imported from "react-devtools-feature-flags".
  ************************************************************************/
 
-export const consoleManagedByDevToolsDuringStrictMode = false;
 export const enableLogger = false;
 export const enableStyleXFeatures = false;
 export const isInternalFacebookBuild = false;

packages/react-devtools-shared/src/config/DevToolsFeatureFlags.default.js

@@ -13,7 +13,6 @@
  * It should always be imported from "react-devtools-feature-flags".
  ************************************************************************/
 
-export const consoleManagedByDevToolsDuringStrictMode = true;
 export const enableLogger = false;
 export const enableStyleXFeatures = false;
 export const isInternalFacebookBuild = false;

packages/react-devtools-shared/src/config/DevToolsFeatureFlags.extension-fb.js

@@ -13,7 +13,6 @@
  * It should always be imported from "react-devtools-feature-flags".
  ************************************************************************/
 
-export const consoleManagedByDevToolsDuringStrictMode = true;
 export const enableLogger = true;
 export const enableStyleXFeatures = true;
 export const isInternalFacebookBuild = true;

packages/react-devtools-shared/src/config/DevToolsFeatureFlags.extension-oss.js

@@ -13,7 +13,6 @@
  * It should always be imported from "react-devtools-feature-flags".
  ************************************************************************/
 
-export const consoleManagedByDevToolsDuringStrictMode = true;
 export const enableLogger = false;
 export const enableStyleXFeatures = false;
 export const isInternalFacebookBuild = false;