fix(base64): always use utf8 safe encoding and decoding

src/data-types/_utils.ts

@@ -13,12 +13,10 @@ export function assertType<T>(
 }
 
 export function _base64Encode(
-  data: Uint8Array | string,
+  data: Uint8Array,
   base64Options?: Base64Options,
 ): Base64 {
-  let encoded = btoa(
-    typeof data === "string" ? data : String.fromCodePoint(...data),
-  );
+  let encoded = btoa(String.fromCodePoint(...data));
   if (base64Options?.urlSafe) {
     encoded = encoded
       .replace(/\+/g, "-")

src/data-types/base64.ts

@@ -40,15 +40,8 @@ export const assertBase64 = (input: unknown, opts?: Base64Options) =>
  * @param encoding - The encoding to use. Default is `utf8`.
  * @group Base64
  */
-export function base64ToText(
-  string: Base64,
-  opts?: Base64Options & { encoding?: "utf8" },
-): string {
-  if (opts?.encoding === "utf8") {
-    return new TextDecoder().decode(base64ToUint8Array(string, opts));
-  }
-  assertBase64(string, opts);
-  return globalThis.atob(opts?.urlSafe ? _decodeURLSafe(string) : string);
+export function base64ToText(string: Base64, opts?: Base64Options): string {
+  return new TextDecoder().decode(base64ToUint8Array(string, opts));
 }
 
 /**

src/data-types/text.ts

@@ -86,12 +86,7 @@ export function textToUint8Array(string: string): Uint8Array {
  * @param encoding - The encoding to use. Default is `utf8`.
  * @group Text
  */
-export function textToBase64(
-  string: string,
-  opts?: Base64Options & { encoding?: "utf8" },
-): Base64 {
+export function textToBase64(string: string, opts?: Base64Options): Base64 {
   assertText(string);
-  return opts?.encoding === "utf8"
-    ? _base64Encode(new TextEncoder().encode(string), opts)
-    : _base64Encode(string, opts);
+  return _base64Encode(new TextEncoder().encode(string), opts);
 }