fix: initializer file not loaded in Expo52 (#6980)

Turns out that `sideEffects` field was ignored and `isWeb()` check
evaluated to static false, removing `initializers.ts` from the bundle.

Fixes
- #6740
- #6839

Tested it on RNGH web example app using Expo52

Co-authored-by: Michał Bert <[email protected]>

Author: tjzel

packages/react-native-reanimated/package.json

@@ -175,9 +175,13 @@
     }
   },
   "sideEffects": [
+    "./src/layoutReanimation/animationsManager.ts",
     "./lib/module/layoutReanimation/animationsManager.js",
+    "./src/core.ts",
     "./lib/module/core.js",
+    "./src/initializers.ts",
     "./lib/module/initializers.js",
+    "./src/index.ts",
     "./lib/module/index.js"
   ]
 }

packages/react-native-reanimated/src/core.ts

@@ -1,6 +1,6 @@
 'use strict';
 import { ReanimatedModule } from './ReanimatedModule';
-import { isWeb, shouldBeUseWeb, isFabric } from './PlatformChecker';
+import { shouldBeUseWeb, isFabric } from './PlatformChecker';
 import type {
   AnimatedKeyboardOptions,
   LayoutAnimationBatchItem,
@@ -11,10 +11,10 @@ import type {
   ValueRotation,
   WorkletFunction,
 } from './commonTypes';
-import { makeShareableCloneRecursive } from './shareables';
+import { ReanimatedError } from './errors';
 import { initializeUIRuntime } from './initializers';
 import { SensorContainer } from './SensorContainer';
-import { ReanimatedError } from './errors';
+import { makeShareableCloneRecursive } from './shareables';
 
 export { startMapper, stopMapper } from './mappers';
 export { runOnJS, runOnUI, executeOnUIRuntimeSync } from './threads';
@@ -154,9 +154,7 @@ export function unregisterSensor(sensorId: number): void {
   return sensorContainer.unregisterSensor(sensorId);
 }
 
-if (!isWeb()) {
-  initializeUIRuntime(ReanimatedModule);
-}
+initializeUIRuntime(ReanimatedModule);
 
 type FeaturesConfig = {
   enableLayoutAnimations: boolean;

packages/react-native-reanimated/src/initializers.ts

@@ -1,6 +1,11 @@
 'use strict';
 import { registerReanimatedError, reportFatalErrorOnJS } from './errors';
-import { isChromeDebugger, isJest, shouldBeUseWeb } from './PlatformChecker';
+import {
+  isChromeDebugger,
+  isJest,
+  isWeb,
+  shouldBeUseWeb,
+} from './PlatformChecker';
 import {
   runOnJS,
   setupMicrotasks,
@@ -180,6 +185,9 @@ function setupRequestAnimationFrame() {
 }
 
 export function initializeUIRuntime(ReanimatedModule: IReanimatedModule) {
+  if (isWeb()) {
+    return;
+  }
   if (!ReanimatedModule) {
     // eslint-disable-next-line reanimated/use-reanimated-error
     throw new Error(