fix: allow web transformer to run without a compiled worklet

src/Transformer.ts

@@ -1,3 +1,5 @@
+import { Platform } from 'react-native';
+
 export type Selection = { start: number; end: number };
 
 export type TransformerWorklet = (input: {
@@ -17,11 +19,17 @@ export class Transformer {
   private readonly _worklet: TransformerWorklet;
 
   constructor(worklet: TransformerWorklet) {
-    const workletHash = (worklet as { __workletHash?: number }).__workletHash;
-    if (workletHash == null) {
-      throw new Error(
-        '[rntti] Transformer must be a worklet. Did you forget to add the "worklet" directive?',
-      );
+    // On web there is no UI runtime: the web TransformerTextInput runs the
+    // worklet synchronously in JS, so it doesn't need to be compiled by the
+    // worklets plugin. Native runs it on the UI thread and requires a real
+    // worklet, so keep enforcing the directive there.
+    if (Platform.OS !== 'web') {
+      const workletHash = (worklet as { __workletHash?: number }).__workletHash;
+      if (workletHash == null) {
+        throw new Error(
+          '[rntti] Transformer must be a worklet. Did you forget to add the "worklet" directive?',
+        );
+      }
     }
     this._worklet = worklet;
   }

src/__tests__/Transformer.test.ts

@@ -1,3 +1,5 @@
+import { Platform } from 'react-native';
+
 import { Transformer } from '../Transformer';
 
 describe('Transformer', () => {
@@ -10,6 +12,18 @@ describe('Transformer', () => {
     ).toThrow(/Transformer must be a worklet/i);
   });
 
+  it('does not require a compiled worklet on web', () => {
+    // On web the transformer runs synchronously in JS, so a plain function
+    // (no worklets plugin) is accepted.
+    jest.replaceProperty(Platform, 'OS', 'web');
+    expect(
+      () =>
+        new Transformer(({ value }) => {
+          return { value };
+        }),
+    ).not.toThrow();
+  });
+
   it('accepts a worklet transformer', () => {
     expect(
       () =>