using v4

package.json

@@ -79,6 +79,6 @@
         }
     ],
     "dependencies": {
-        "web-streams-polyfill": "^3.0.3"
+        "web-streams-polyfill": "^4.0.0-beta.1"
     }
 }

streams.cjs

@@ -7,7 +7,7 @@ if (!globalThis.ReadableStream) {
     Object.assign(globalThis, require('stream/web'))
   } catch (error) {
 		// TODO: Remove when only supporting node >= 16.5.0
-    Object.assign(globalThis, require('web-streams-polyfill/dist/ponyfill.es2018.js'))
+    require('web-streams-polyfill/polyfill')
   }
 }
 

test.js

@@ -388,9 +388,7 @@ test('returns a readable stream', t => {
 	t.true(typeof stream.getReader === 'function');
 });
 
-test('checking instanceof blob#stream', async t => {
-	// eslint-disable-next-line node/no-unsupported-features/es-syntax
-	const {ReadableStream} = await import('stream/web').catch(_ => import('web-streams-polyfill/dist/ponyfill.es2018.js'));
+test('checking instanceof blob#stream', t => {
 	const stream = new File([], '').stream();
-	t.true(stream instanceof ReadableStream);
+	t.true(stream instanceof globalThis.ReadableStream);
 });