BREAKING(encoding): replace Ascii85Options with EncodeAscii85Options and DecodeAscii85Options

encoding/ascii85.ts

@@ -25,11 +25,14 @@
 
 import { validateBinaryLike } from "./_validate_binary_like.ts";
 
-/** Supported ascii85 standards for {@linkcode Ascii85Options}. */
+/**
+ * Supported ascii85 standards for {@linkcode EncodeAscii85Options} and
+ * {@linkcode DecodeAscii85Options}.
+ */
 export type Ascii85Standard = "Adobe" | "btoa" | "RFC 1924" | "Z85";
 
-/** Options for {@linkcode encodeAscii85} and {@linkcode decodeAscii85}. */
-export interface Ascii85Options {
+/** Options for {@linkcode encodeAscii85}. */
+export interface EncodeAscii85Options {
   /**
    * Character set and delimiter (if supported and used).
    *
@@ -43,6 +46,7 @@ export interface Ascii85Options {
    */
   delimiter?: boolean;
 }
+
 const rfc1924 =
   "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#$%&()*+-;<=>?@^_`{|}~" as const;
 const Z85 =
@@ -66,11 +70,12 @@ const Z85 =
  */
 export function encodeAscii85(
   data: ArrayBuffer | Uint8Array | string,
-  options?: Ascii85Options,
+  options: EncodeAscii85Options = {},
 ): string {
   let uint8 = validateBinaryLike(data);
 
-  const standard = options?.standard ?? "Adobe";
+  const { standard = "Adobe" } = options;
+
   let output: string[] = [];
   let v: number;
   let n = 0;
@@ -129,6 +134,9 @@ export function encodeAscii85(
   return output.slice(0, output.length - difference).join("");
 }
 
+/** Options for {@linkcode decodeAscii85}. */
+export type DecodeAscii85Options = Omit<EncodeAscii85Options, "delimiter">;
+
 /**
  * Decodes a ascii85-encoded string.
  *
@@ -149,11 +157,12 @@ export function encodeAscii85(
  */
 export function decodeAscii85(
   ascii85: string,
-  options?: Ascii85Options,
+  options: DecodeAscii85Options = {},
 ): Uint8Array {
-  const encoding = options?.standard ?? "Adobe";
+  const { standard = "Adobe" } = options;
+
   // translate all encodings to most basic adobe/btoa one and decompress some special characters ("z" and "y")
-  switch (encoding) {
+  switch (standard) {
     case "Adobe":
       ascii85 = ascii85.replaceAll(/(<~|~>)/g, "").replaceAll("z", "!!!!!");
       break;

encoding/ascii85_test.ts

@@ -174,7 +174,6 @@ for (const [standard, tests] of Object.entries(testCasesDelimiter)) {
         assertEquals(
           decodeAscii85(b85 as string, {
             standard: standard as Ascii85Standard,
-            delimiter: true,
           }),
           utf8encoder.encode(bin),
         );