[SBA-03] extract WASM functions from LNC into WasmManager class

lib/index.test.ts

@@ -42,6 +42,26 @@ describe('Index Module', () => {
       expect(typeof globalThis.WebAssembly?.instantiateStreaming).toBe(
         'function'
       );
+
+      // Call the polyfilled function and ensure it delegates to WebAssembly.instantiate
+      const arrayBufferMock = vi.fn().mockResolvedValue(new ArrayBuffer(8));
+      const response = Promise.resolve({
+        arrayBuffer: arrayBufferMock
+      } as unknown as Response);
+
+      const instantiateSpy = vi
+        .spyOn(globalThis.WebAssembly, 'instantiate')
+        .mockResolvedValue({
+          exports: {}
+        });
+
+      await globalThis.WebAssembly.instantiateStreaming?.(
+        response as any,
+        { imports: true } as any
+      );
+
+      expect(arrayBufferMock).toHaveBeenCalledTimes(1);
+      expect(instantiateSpy).toHaveBeenCalledTimes(1);
     });
 
     it('should use existing WebAssembly.instantiateStreaming when available', async () => {

lib/index.ts

@@ -2,6 +2,7 @@
 require('./wasm_exec');
 
 import LNC from './lnc';
+import { WasmManager } from './wasmManager';
 
 // polyfill
 if (!WebAssembly.instantiateStreaming) {
@@ -14,3 +15,4 @@ if (!WebAssembly.instantiateStreaming) {
 export type { LncConfig, CredentialStore } from './types/lnc';
 export * from '@lightninglabs/lnc-core';
 export default LNC;
+export { WasmManager };