| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>All attributes accessors are unique function objects</title> |
| <link rel="help" href="https://heycam.github.io/webidl/#idl-interface-mixins"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| "use strict"; |
| |
| test(() => { |
| const seenPrototypes = new WeakSet([Function.prototype]); |
| const seenFunctions = new WeakMap(); |
| |
| for (const windowKey of Object.getOwnPropertyNames(window)) { |
| const windowValue = window[windowKey]; |
| if (typeof windowValue !== "function") continue; |
| |
| const {prototype} = windowValue; |
| if (!prototype || seenPrototypes.has(prototype)) continue; |
| seenPrototypes.add(prototype); |
| |
| for (const key of Object.getOwnPropertyNames(prototype)) { |
| const assert_not_seen = (fn, field) => { |
| const fnInfo = `${windowKey}.${key}.${field}`; |
| assert_equals(seenFunctions.get(fn), undefined, fnInfo); |
| seenFunctions.set(fn, fnInfo); |
| }; |
| |
| const desc = Object.getOwnPropertyDescriptor(prototype, key); |
| if (desc.get) assert_not_seen(desc.get, "[[Get]]"); |
| if (desc.set) assert_not_seen(desc.set, "[[Set]]"); |
| } |
| } |
| }, "For attributes, each copy of the accessor property has distinct built-in function objects for its getters and setters."); |
| </script> |
