fix(webidl): properly implement setlike (#17363)

ext/webgpu/src/01_webgpu.js

@@ -34,14 +34,9 @@
     SafeArrayIterator,
     SafePromiseAll,
     Set,
-    SetPrototypeEntries,
-    SetPrototypeForEach,
     SetPrototypeHas,
-    SetPrototypeKeys,
-    SetPrototypeValues,
     Symbol,
     SymbolFor,
-    SymbolIterator,
     TypeError,
     Uint32Array,
     Uint32ArrayPrototype,
@@ -602,60 +597,20 @@
 
   function createGPUSupportedFeatures(features) {
     /** @type {GPUSupportedFeatures} */
-    const adapterFeatures = webidl.createBranded(GPUSupportedFeatures);
-    adapterFeatures[_features] = new Set(features);
-    return adapterFeatures;
+    const supportedFeatures = webidl.createBranded(GPUSupportedFeatures);
+    supportedFeatures[webidl.setlikeInner] = new Set(features);
+    return webidl.setlike(
+      supportedFeatures,
+      GPUSupportedFeaturesPrototype,
+      true,
+    );
   }
 
   class GPUSupportedFeatures {
-    /** @type {Set<string>} */
-    [_features];
-
     constructor() {
       webidl.illegalConstructor();
     }
 
-    /** @return {IterableIterator<[string, string]>} */
-    entries() {
-      webidl.assertBranded(this, GPUSupportedFeaturesPrototype);
-      return SetPrototypeEntries(this[_features]);
-    }
-
-    /** @return {void} */
-    forEach(callbackfn, thisArg) {
-      webidl.assertBranded(this, GPUSupportedFeaturesPrototype);
-      SetPrototypeForEach(this[_features], callbackfn, thisArg);
-    }
-
-    /** @return {boolean} */
-    has(value) {
-      webidl.assertBranded(this, GPUSupportedFeaturesPrototype);
-      return SetPrototypeHas(this[_features], value);
-    }
-
-    /** @return {IterableIterator<string>} */
-    keys() {
-      webidl.assertBranded(this, GPUSupportedFeaturesPrototype);
-      return SetPrototypeKeys(this[_features]);
-    }
-
-    /** @return {IterableIterator<string>} */
-    values() {
-      webidl.assertBranded(this, GPUSupportedFeaturesPrototype);
-      return SetPrototypeValues(this[_features]);
-    }
-
-    /** @return {number} */
-    get size() {
-      webidl.assertBranded(this, GPUSupportedFeaturesPrototype);
-      return this[_features].size;
-    }
-
-    [SymbolIterator]() {
-      webidl.assertBranded(this, GPUSupportedFeaturesPrototype);
-      return this[_features][SymbolIterator]();
-    }
-
     [SymbolFor("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect([...new SafeArrayIterator(this.values())])

ext/webidl/00_webidl.js

@@ -61,6 +61,14 @@
     ReflectOwnKeys,
     RegExpPrototypeTest,
     Set,
+    SetPrototypeEntries,
+    SetPrototypeForEach,
+    SetPrototypeKeys,
+    SetPrototypeValues,
+    SetPrototypeHas,
+    SetPrototypeClear,
+    SetPrototypeDelete,
+    SetPrototypeAdd,
     // TODO(lucacasonato): add SharedArrayBuffer to primordials
     // SharedArrayBuffer,
     String,
@@ -1048,6 +1056,108 @@
     });
   }
 
+  const setlikeInner = Symbol("[[set]]");
+
+  // Ref: https://webidl.spec.whatwg.org/#es-setlike
+  function setlike(obj, objPrototype, readonly) {
+    ObjectDefineProperties(obj, {
+      size: {
+        configurable: true,
+        enumerable: true,
+        get() {
+          assertBranded(this, objPrototype);
+          return obj[setlikeInner].size;
+        },
+      },
+      [SymbolIterator]: {
+        configurable: true,
+        enumerable: false,
+        writable: true,
+        value() {
+          assertBranded(this, objPrototype);
+          return obj[setlikeInner][SymbolIterator]();
+        },
+      },
+      entries: {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value() {
+          assertBranded(this, objPrototype);
+          return SetPrototypeEntries(obj[setlikeInner]);
+        },
+      },
+      keys: {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value() {
+          assertBranded(this, objPrototype);
+          return SetPrototypeKeys(obj[setlikeInner]);
+        },
+      },
+      values: {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value() {
+          assertBranded(this, objPrototype);
+          return SetPrototypeValues(obj[setlikeInner]);
+        },
+      },
+      forEach: {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value(callbackfn, thisArg) {
+          assertBranded(this, objPrototype);
+          return SetPrototypeForEach(obj[setlikeInner], callbackfn, thisArg);
+        },
+      },
+      has: {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value(value) {
+          assertBranded(this, objPrototype);
+          return SetPrototypeHas(obj[setlikeInner], value);
+        },
+      },
+    });
+
+    if (!readonly) {
+      ObjectDefineProperties(obj, {
+        add: {
+          configurable: true,
+          enumerable: true,
+          writable: true,
+          value(value) {
+            assertBranded(this, objPrototype);
+            return SetPrototypeAdd(obj[setlikeInner], value);
+          },
+        },
+        delete: {
+          configurable: true,
+          enumerable: true,
+          writable: true,
+          value(value) {
+            assertBranded(this, objPrototype);
+            return SetPrototypeDelete(obj[setlikeInner], value);
+          },
+        },
+        clear: {
+          configurable: true,
+          enumerable: true,
+          writable: true,
+          value() {
+            assertBranded(this, objPrototype);
+            return SetPrototypeClear(obj[setlikeInner]);
+          },
+        },
+      });
+    }
+  }
+
   window.__bootstrap ??= {};
   window.__bootstrap.webidl = {
     type,
@@ -1068,5 +1178,7 @@
     illegalConstructor,
     mixinPairIterable,
     configurePrototype,
+    setlike,
+    setlikeInner,
   };
 })(this);