global-object-implicit-this-value.any.js (4436B)
1 // META: global=window,worker 2 3 // https://webidl.spec.whatwg.org/#dfn-attribute-getter (step 1.1.2.1) 4 // https://webidl.spec.whatwg.org/#dfn-attribute-setter (step 4.5.1) 5 // https://webidl.spec.whatwg.org/#dfn-create-operation-function (step 2.1.2.1) 6 7 const notGlobalObject = Object.create(Object.getPrototypeOf(globalThis)); 8 9 test(() => { 10 assert_throws_js(TypeError, () => { Object.create(globalThis).self; }); 11 assert_throws_js(TypeError, () => { getGlobalPropertyDescriptor("location").get.call(notGlobalObject); }); 12 assert_throws_js(TypeError, () => { Reflect.get(globalThis, "navigator", notGlobalObject); }); 13 assert_throws_js(TypeError, () => { new Proxy(globalThis, {}).onerror; }); 14 }, "Global object's getter throws when called on incompatible object"); 15 16 test(() => { 17 assert_throws_js(TypeError, () => { Object.create(globalThis).origin = origin; }); 18 assert_throws_js(TypeError, () => { getGlobalPropertyDescriptor("onerror").set.call(notGlobalObject, onerror); }); 19 assert_throws_js(TypeError, () => { Reflect.set(globalThis, "onoffline", onoffline, notGlobalObject); }); 20 assert_throws_js(TypeError, () => { new Proxy(globalThis, {}).ononline = ononline; }); 21 }, "Global object's setter throws when called on incompatible object"); 22 23 test(() => { 24 assert_throws_js(TypeError, () => { Object.create(globalThis).setInterval(() => {}, 100); }); 25 assert_throws_js(TypeError, () => { clearTimeout.call(notGlobalObject, () => {}); }); 26 assert_throws_js(TypeError, () => { Reflect.apply(btoa, notGlobalObject, [""]); }); 27 assert_throws_js(TypeError, () => { new Proxy(globalThis, {}).removeEventListener("foo", () => {}); }); 28 }, "Global object's operation throws when called on incompatible object"); 29 30 if (typeof document !== "undefined") { 31 test(() => { 32 assert_throws_js(TypeError, () => { Object.getOwnPropertyDescriptor(window, "document").get.call(document.all); }); 33 }, "Global object's getter throws when called on incompatible object (document.all)"); 34 35 test(() => { 36 assert_throws_js(TypeError, () => { Object.getOwnPropertyDescriptor(window, "name").set.call(document.all); }); 37 }, "Global object's setter throws when called on incompatible object (document.all)"); 38 39 test(() => { 40 assert_throws_js(TypeError, () => { focus.call(document.all); }); 41 }, "Global object's operation throws when called on incompatible object (document.all)"); 42 } 43 44 // An engine might have different code path for calling a function from outer scope to implement step 1.b.iii of https://tc39.es/ecma262/#sec-evaluatecall 45 const locationGetter = getGlobalPropertyDescriptor("location").get; 46 test(() => { 47 assert_equals(getGlobalPropertyDescriptor("self").get.call(null), self); 48 assert_equals((() => locationGetter())(), location); 49 assert_equals(Reflect.get(globalThis, "origin", null), origin); 50 assert_equals(Reflect.get(globalThis, "onoffline", undefined), onoffline); 51 }, "Global object's getter works when called on null / undefined"); 52 53 test(() => { 54 const fn = () => {}; 55 56 // origin is [Replaceable] 57 getGlobalPropertyDescriptor("origin").set.call(null, "foo"); 58 assert_equals(origin, "foo"); 59 getGlobalPropertyDescriptor("onerror").set.call(undefined, fn); 60 assert_equals(onerror, fn); 61 assert_true(Reflect.set(globalThis, "onoffline", fn, null)); 62 assert_equals(onoffline, fn); 63 64 const ononlineSetter = getGlobalPropertyDescriptor("ononline").set; 65 (() => { ononlineSetter(fn); })(); 66 assert_equals(ononline, fn); 67 }, "Global object's setter works when called on null / undefined"); 68 69 // An engine might have different code path for calling a function from outer scope to implement step 1.b.iii of https://tc39.es/ecma262/#sec-evaluatecall 70 const __addEventListener = addEventListener; 71 test(() => { 72 assert_equals(atob.call(null, ""), ""); 73 assert_equals(typeof (0, setInterval)(() => {}, 100), "number"); 74 75 (() => { __addEventListener("foo", event => { event.preventDefault(); }); })(); 76 const __dispatchEvent = dispatchEvent; 77 (() => { assert_false(__dispatchEvent(new Event("foo", { cancelable: true }))); })(); 78 }, "Global object's operation works when called on null / undefined"); 79 80 function getGlobalPropertyDescriptor(key) { 81 for (let obj = globalThis; obj; obj = Object.getPrototypeOf(obj)) { 82 const desc = Object.getOwnPropertyDescriptor(obj, key); 83 if (desc) return desc; 84 } 85 }