Add EasyList filter support

test/asset-inliner.test.mjs

@@ -81,3 +81,25 @@ test("external asset reporting parses srcset-like attributes without splitting U
     "https://media.example/photos/id/master/w_240,c_limit/photo.jpg"
   ]);
 });
+
+test("asset inliner skips URLs blocked by the filter hook", async () => {
+  const blocked = [];
+  const inliner = new AssetInliner({
+    shouldBlockAsset: (url, resourceType) => {
+      blocked.push([url, resourceType]);
+      return true;
+    }
+  });
+
+  const output = await inliner.inlineHtml(`
+    <link rel="stylesheet" href="https://ads.example/ad.css">
+    <img src="https://ads.example/ad.png">
+  `, "https://publisher.example/article");
+
+  assert.doesNotMatch(output, /ad\.css/);
+  assert.match(output, /data:image\/gif;base64/);
+  assert.deepEqual(blocked, [
+    ["https://ads.example/ad.css", "stylesheet"],
+    ["https://ads.example/ad.png", "image"]
+  ]);
+});