[compiler] [playground] Show internals toggle (#34399)

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## Summary

Added a "Show Internals" toggle switch to either show only the Config,
Input, Output, and Source Map tabs, or these tabs + all the additional
compiler options. The open/close state of these tabs will be preserved
(unless on page refresh, which is the same as the currently
functionality).


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Explain the **motivation** for making this change. What existing problem
does the pull request solve?
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https://github.com/user-attachments/assets/8eb0f69e-360c-4e9b-9155-7aa185a0c018

compiler/apps/playground/components/Editor/Output.tsx

@@ -64,12 +64,16 @@ type Props = {
 async function tabify(
   source: string,
   compilerOutput: CompilerOutput,
+  showInternals: boolean,
 ): Promise<Map<string, ReactNode>> {
   const tabs = new Map<string, React.ReactNode>();
   const reorderedTabs = new Map<string, React.ReactNode>();
   const concattedResults = new Map<string, string>();
   // Concat all top level function declaration results into a single tab for each pass
   for (const [passName, results] of compilerOutput.results) {
+    if (!showInternals && passName !== 'Output' && passName !== 'SourceMap') {
+      continue;
+    }
     for (const result of results) {
       switch (result.kind) {
         case 'hir': {
@@ -225,10 +229,10 @@ function Output({store, compilerOutput}: Props): JSX.Element {
   }
 
   useEffect(() => {
-    tabify(store.source, compilerOutput).then(tabs => {
+    tabify(store.source, compilerOutput, store.showInternals).then(tabs => {
       setTabs(tabs);
     });
-  }, [store.source, compilerOutput]);
+  }, [store.source, compilerOutput, store.showInternals]);
 
   const changedPasses: Set<string> = new Set(['Output', 'HIR']); // Initial and final passes should always be bold
   let lastResult: string = '';
@@ -248,7 +252,7 @@ function Output({store, compilerOutput}: Props): JSX.Element {
   return (
     <>
       <TabbedWindow
-        defaultTab="HIR"
+        defaultTab={store.showInternals ? 'HIR' : 'Output'}
         setTabsOpen={setTabsOpen}
         tabsOpen={tabsOpen}
         tabs={tabs}

compiler/apps/playground/components/Header.tsx

@@ -14,10 +14,11 @@ import {useState} from 'react';
 import {defaultStore} from '../lib/defaultStore';
 import {IconGitHub} from './Icons/IconGitHub';
 import Logo from './Logo';
-import {useStoreDispatch} from './StoreContext';
+import {useStore, useStoreDispatch} from './StoreContext';
 
 export default function Header(): JSX.Element {
   const [showCheck, setShowCheck] = useState(false);
+  const store = useStore();
   const dispatchStore = useStoreDispatch();
   const {enqueueSnackbar, closeSnackbar} = useSnackbar();
 
@@ -56,6 +57,27 @@ export default function Header(): JSX.Element {
         <p className="hidden select-none sm:block">React Compiler Playground</p>
       </div>
       <div className="flex items-center text-[15px] gap-4">
+        <div className="flex items-center gap-2">
+          <label className="relative inline-block w-[34px] h-5">
+            <input
+              type="checkbox"
+              checked={store.showInternals}
+              onChange={() => dispatchStore({type: 'toggleInternals'})}
+              className="absolute opacity-0 cursor-pointer h-full w-full m-0"
+            />
+            <span
+              className={clsx(
+                'absolute inset-0 rounded-full cursor-pointer transition-all duration-250',
+                "before:content-[''] before:absolute before:w-4 before:h-4 before:left-0.5 before:bottom-0.5",
+                'before:bg-white before:rounded-full before:transition-transform before:duration-250',
+                'focus-within:shadow-[0_0_1px_#2196F3]',
+                store.showInternals
+                  ? 'bg-blue-500 before:translate-x-3.5'
+                  : 'bg-gray-300',
+              )}></span>
+          </label>
+          <span className="text-secondary">Show Internals</span>
+        </div>
         <button
           title="Reset Playground"
           aria-label="Reset Playground"

compiler/apps/playground/components/StoreContext.tsx

@@ -56,8 +56,11 @@ type ReducerAction =
       type: 'updateFile';
       payload: {
         source: string;
-        config?: string;
+        config: string;
       };
+    }
+  | {
+      type: 'toggleInternals';
     };
 
 function storeReducer(store: Store, action: ReducerAction): Store {
@@ -75,5 +78,12 @@ function storeReducer(store: Store, action: ReducerAction): Store {
       };
       return newStore;
     }
+    case 'toggleInternals': {
+      const newStore = {
+        ...store,
+        showInternals: !store.showInternals,
+      };
+      return newStore;
+    }
   }
 }

compiler/apps/playground/lib/defaultStore.ts

@@ -38,9 +38,11 @@ import type { PluginOptions } from 'babel-plugin-react-compiler/dist';
 export const defaultStore: Store = {
   source: index,
   config: defaultConfig,
+  showInternals: false,
 };
 
 export const emptyStore: Store = {
   source: '',
   config: '',
+  showInternals: false,
 };

compiler/apps/playground/lib/stores/store.ts

@@ -17,12 +17,13 @@ import {defaultStore, defaultConfig} from '../defaultStore';
  */
 export interface Store {
   source: string;
-  config?: string;
+  config: string;
+  showInternals: boolean;
 }
 export function encodeStore(store: Store): string {
   return compressToEncodedURIComponent(JSON.stringify(store));
 }
-export function decodeStore(hash: string): Store {
+export function decodeStore(hash: string): any {
   return JSON.parse(decompressFromEncodedURIComponent(hash));
 }
 
@@ -63,17 +64,14 @@ export function initStoreFromUrlOrLocalStorage(): Store {
    */
   if (!encodedSource) return defaultStore;
 
-  const raw = decodeStore(encodedSource);
+  const raw: any = decodeStore(encodedSource);
 
   invariant(isValidStore(raw), 'Invalid Store');
 
-  // Add config property if missing for backwards compatibility
-  if (!('config' in raw) || !raw['config']) {
-    return {
-      ...raw,
-      config: defaultConfig,
-    };
-  }
-
-  return raw;
+  // Make sure all properties are populated
+  return {
+    source: raw.source,
+    config: 'config' in raw ? raw.config : defaultConfig,
+    showInternals: 'showInternals' in raw ? raw.showInternals : false,
+  };
 }