fix(web): implement DOMException#code (#9015)

Co-authored-by: Luca Casonato <lucacasonato@yahoo.com>

cli/tests/unit/dom_exception_test.ts

@@ -6,4 +6,13 @@ unitTest(function testDomError() {
   assert(de);
   assertEquals(de.message, "foo");
   assertEquals(de.name, "bar");
+  assertEquals(de.code, 0);
+});
+
+unitTest(function testKnownDomException() {
+  const de = new DOMException("foo", "SyntaxError");
+  assert(de);
+  assertEquals(de.message, "foo");
+  assertEquals(de.name, "SyntaxError");
+  assertEquals(de.code, 12);
 });

cli/tests/wpt.jsonc

@@ -170,14 +170,7 @@
       ]
     },
     "measure-l3",
-    {
-      "name": "structured-serialize-detail",
-      "expectFail": [
-        // TODO(lucacasonato): re-enable when we use real structured clone.
-        "Mark: Throw an exception when the detail property cannot be structured-serialized.",
-        "Measure: Throw an exception when the detail property cannot be structured-serialized."
-      ]
-    },
+    "structured-serialize-detail",
     "user_timing_exists"
   ]
 }

op_crates/web/00_dom_exception.js

@@ -1,15 +1,50 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
-// eslint-disable-next-line @typescript-eslint/no-unused-vars
-class DOMException extends Error {
+((window) => {
+  const nameToCodeMapping = Object.create(
+    null,
+    {
+      IndexSizeError: { value: 1 },
+      HierarchyRequestError: { value: 3 },
+      WrongDocumentError: { value: 4 },
+      InvalidCharacterError: { value: 5 },
+      NoModificationAllowedError: { value: 7 },
+      NotFoundError: { value: 8 },
+      NotSupportedError: { value: 9 },
+      InvalidStateError: { value: 11 },
+      SyntaxError: { value: 12 },
+      InvalidModificationError: { value: 13 },
+      NamespaceError: { value: 14 },
+      InvalidAccessError: { value: 15 },
+      TypeMismatchError: { value: 17 },
+      SecurityError: { value: 18 },
+      NetworkError: { value: 19 },
+      AbortError: { value: 20 },
+      URLMismatchError: { value: 21 },
+      QuotaExceededError: { value: 22 },
+      TimeoutError: { value: 23 },
+      InvalidNodeTypeError: { value: 24 },
+      DataCloneError: { value: 25 },
+    },
+  );
+  class DOMException extends Error {
     #name = "";
+    #code = 0;
 
     constructor(message = "", name = "Error") {
       super(message);
       this.#name = name;
+      this.#code = nameToCodeMapping[name] ?? 0;
     }
 
     get name() {
       return this.#name;
     }
-}
+
+    get code() {
+      return this.#code;
+    }
+  }
+
+  window.DOMException = DOMException;
+})(this);

op_crates/web/lib.deno_web.d.ts

@@ -9,6 +9,7 @@ declare class DOMException extends Error {
   constructor(message?: string, name?: string);
   readonly name: string;
   readonly message: string;
+  readonly code: number;
 }
 
 interface EventInit {