chore(ext/web): use a non-resource stream for textDecoderStreamCleans…

…UpOnCancel (denoland#21181)

Follow-up fix to denoland#21074

cli/tests/unit/text_encoding_test.ts

@@ -1,5 +1,10 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-import { assert, assertEquals, assertThrows } from "./test_util.ts";
+import {
+ assert,
+ assertEquals,
+ assertStrictEquals,
+ assertThrows,
+} from "./test_util.ts";
 
 Deno.test(function btoaSuccess() {
  const text = "hello world";
@@ -323,9 +328,15 @@ Deno.test(function binaryEncode() {
 Deno.test(
  { permissions: { read: true } },
  async function textDecoderStreamCleansUpOnCancel() {
- const filename = "cli/tests/testdata/assets/hello.txt";
- const file = await Deno.open(filename);
- const readable = file.readable.pipeThrough(new TextDecoderStream());
+ let cancelled = false;
+ const readable = new ReadableStream({
+ start: (controller) => {
+ controller.enqueue(new Uint8Array(12));
+ },
+ cancel: () => {
+ cancelled = true;
+ },
+ }).pipeThrough(new TextDecoderStream());
  const chunks = [];
  for await (const chunk of readable) {
  chunks.push(chunk);
@@ -334,5 +345,6 @@ Deno.test(
  }
  assertEquals(chunks.length, 1);
  assertEquals(chunks[0].length, 12);
+ assertStrictEquals(cancelled, true);
  },
 );