Fix type errors introduced by typescript upgrade

Author: tung2744

packages/authgear-core/src/base64.ts

@@ -1,10 +1,12 @@
 import { encode, decode } from "base64-arraybuffer";
 
+type Base64Input = ArrayBuffer | ArrayBufferView;
+
 /**
  * @internal
  */
-export function _base64URLEncode(arrayBuffer: ArrayBuffer): string {
-  return encode(arrayBuffer)
+export function _base64URLEncode(input: Base64Input): string {
+  return encode(input as ArrayBuffer)
     .replace(/\//g, "_")
     .replace(/\+/g, "-")
     .replace(/=+$/, "");

packages/authgear-web/src/pkce.ts

@@ -7,7 +7,10 @@ async function windowCryptoSubtleDigest(
   algorithm: string,
   data: Uint8Array
 ): Promise<Uint8Array> {
-  const promiseOrEvent = window.crypto.subtle.digest(algorithm, data.buffer);
+  const promiseOrEvent = window.crypto.subtle.digest(
+    algorithm,
+    data.buffer as ArrayBuffer
+  );
   // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
   if (promiseOrEvent.then) {
     return promiseOrEvent.then((output: ArrayBuffer) => {