feat: configurable TextDecoder instance (#80)

cspell.json

@@ -16,6 +16,7 @@
 		"contributorsrc",
 		"conventionalcommits",
 		"deferreds",
+		"esque",
 		"gzipped",
 		"Iterarable",
 		"KATT",

src/async/asyncTypes.ts

@@ -1,3 +1,4 @@
+import { TextDecoderEsque } from "../internals/esque.js";
 import {
 	TsonBranded,
 	TsonType,
@@ -66,6 +67,11 @@ export interface TsonAsyncOptions {
 	 * @default `${crypto.randomUUID} if available, otherwise a random string generated by Math.random`
 	 */
 	nonce?: () => number | string;
+	/**
+	 * Customize a text decoder if your runtime doesn't support the `TextDecoder` API
+	 * @default TextDecoder
+	 */
+	textDecoder?: TextDecoderEsque;
 
 	/**
 	 * The list of types to use

src/async/deserializeAsync.ts

@@ -344,10 +344,11 @@ export function createTsonParseEventSource(opts: TsonAsyncOptions) {
 export function createTsonParseJsonStreamResponse(opts: TsonAsyncOptions) {
 	const instance = createTsonParseAsync(opts);
 
+	const textDecoder = opts.textDecoder ?? new TextDecoder();
+
 	return async <TValue = unknown>(response: Response) => {
 		assert(response.body, "Response body is empty");
 
-		const textDecoder = new TextDecoder();
 		const stringIterator = mapIterable(
 			readableStreamToAsyncIterable(response.body),
 			(v) => textDecoder.decode(v),

src/internals/esque.ts

@@ -0,0 +1,6 @@
+/**
+ * @internal
+ */
+export interface TextDecoderEsque {
+	decode(chunk: Uint8Array): string;
+}