fix(build): align TypeScript and test imports with NodeNext builds and safely copy Uint8Array inputs in browser processing

test/test.browser.ts

@@ -1,5 +1,5 @@
 import { expect, tap } from '@git.zone/tstest/tapbundle';
-import * as smartpreview from '../ts_web/index.ts';
+import * as smartpreview from '../ts_web/index.js';
 
 // Test data - minimal PDF as Uint8Array for browser testing
 const createMinimalPdfBuffer = (): Uint8Array => {
@@ -74,10 +74,16 @@ startxref
   return new TextEncoder().encode(pdfContent);
 };
 
+const uint8ArrayToArrayBuffer = (input: Uint8Array): ArrayBuffer => {
+  const arrayBuffer = new ArrayBuffer(input.byteLength);
+  new Uint8Array(arrayBuffer).set(input);
+  return arrayBuffer;
+};
+
 // Create a mock File object for testing
 const createMockPdfFile = (): File => {
   const buffer = createMinimalPdfBuffer();
-  return new File([buffer], 'test.pdf', { type: 'application/pdf' });
+  return new File([uint8ArrayToArrayBuffer(buffer)], 'test.pdf', { type: 'application/pdf' });
 };
 
 tap.test('should check browser compatibility', async () => {
@@ -117,6 +123,9 @@ tap.test('should throw error when not initialized', async () => {
     expect(true).toEqual(false); // Should not reach here
   } catch (error) {
     expect(error).toBeInstanceOf(smartpreview.PreviewError);
+    if (!(error instanceof smartpreview.PreviewError)) {
+      throw error;
+    }
     expect(error.errorType).toEqual('PROCESSING_FAILED');
   }
 });
@@ -129,6 +138,9 @@ tap.test('should validate input', async () => {
     expect(true).toEqual(false); // Should not reach here
   } catch (error) {
     expect(error).toBeInstanceOf(smartpreview.PreviewError);
+    if (!(error instanceof smartpreview.PreviewError)) {
+      throw error;
+    }
     expect(error.errorType).toEqual('PROCESSING_FAILED');
   }
 });
@@ -298,7 +310,7 @@ tap.test('should measure different input type processing times', async () => {
     
     // Test ArrayBuffer input
     const buffer = createMinimalPdfBuffer();
-    const arrayBuffer = buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
+    const arrayBuffer = uint8ArrayToArrayBuffer(buffer);
     const bufferStartTime = performance.now();
     try {
       await preview.generatePreview(arrayBuffer, { quality: 70, width: 300, height: 200 });
@@ -367,4 +379,4 @@ tap.test('should measure progress callback overhead', async () => {
   }
 });
 
-export default tap.start();
+export default tap.start();