fix(build): modernize project tooling and tighten TypeScript typings

ts/index.ts

@@ -10,13 +10,13 @@ export function base64ToUint8Array(base64: string): Uint8Array {
   return plugins.uInt8ArrayExtras.base64ToUint8Array(base64);
 }
 
-export const isUint8Array = (obj: any): obj is Uint8Array => {
+export const isUint8Array = (obj: unknown): obj is Uint8Array => {
   return plugins.uInt8ArrayExtras.isUint8Array(obj);
 };
 
-export function isBufferLike(obj: any): obj is ArrayBufferLike | Buffer {
+export function isBufferLike(obj: unknown): obj is ArrayBufferLike | Buffer {
   // Check for ArrayBufferLike objects in any environment
-  if (obj && typeof obj.byteLength === 'number') {
+  if (obj && typeof (obj as { byteLength?: unknown }).byteLength === 'number') {
     return true;
   }