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load("test-common.js");
try {
assert(Object.getOwnPropertyDescriptor(new Proxy({}, { getOwnPropertyDescriptor: null }), "a") === undefined);
assert(Object.getOwnPropertyDescriptor(new Proxy({}, { getOwnPropertyDescriptor: undefined }), "a") === undefined);
assert(Object.getOwnPropertyDescriptor(new Proxy({}, {}), "a") === undefined);
let o = {};
let p = new Proxy(o, {
getOwnPropertyDescriptor(target, property) {
assert(target === o);
assert(property === "foo");
}
});
Object.getOwnPropertyDescriptor(p, "foo");
o = { foo: "bar" };
Object.defineProperty(o, "baz", { value: "qux", enumerable: false, configurable: true, writable: false });
p = new Proxy(o, {
getOwnPropertyDescriptor(target, property) {
if (property === "baz")
return Object.getOwnPropertyDescriptor(target, "baz");
return { value: target[property], enumerable: false, configurable: true, writable: true };
}
});
let d = Object.getOwnPropertyDescriptor(p, "baz");
assert(d.configurable === true);
assert(d.enumerable === false);
assert(d.writable === false);
assert(d.value === "qux");
assert(d.get === undefined);
assert(d.set === undefined);
d = Object.getOwnPropertyDescriptor(p, "foo");
assert(d.configurable === true);
assert(d.enumerable === false);
assert(d.writable === true);
assert(d.value === "bar");
assert(d.get === undefined);
assert(d.set === undefined);
// Invariants
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(new Proxy({}, {
getOwnPropertyDescriptor: 1
}));
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap wasn't undefined, null, or callable",
});
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(new Proxy({}, {
getOwnPropertyDescriptor() {
return 1;
},
}));
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap violates invariant: must return an object or undefined",
});
o = {};
Object.defineProperty(o, "foo", { value: 10, configurable: false });
p = new Proxy(o, {
getOwnPropertyDescriptor() {
return undefined;
},
});
assert(Object.getOwnPropertyDescriptor(p, "bar") === undefined);
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(p, "foo");
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap violates invariant: cannot return undefined for a property on the target which is a non-configurable property",
});
Object.defineProperty(o, "baz", { value: 20, configurable: true, writable: true, enumerable: true });
Object.preventExtensions(o);
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(p, "baz");
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap violates invariant: cannot report a property as being undefined if it exists as an own property of the target and the target is non-extensible",
});
o = {};
Object.defineProperty(o, "v1", { value: 10, configurable: false });
Object.defineProperty(o, "v2", { value: 10, configurable: false, enumerable: true });
Object.defineProperty(o, "v3", { configurable: false, get() { return 1; } });
Object.defineProperty(o, "v4", { value: 10, configurable: false, writable: false, enumerable: true });
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(new Proxy(o, {
getOwnPropertyDescriptor() {
return { configurable: true };
},
}), "v1");
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap violates invariant: invalid property descriptor for existing property on the target",
});
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(new Proxy(o, {
getOwnPropertyDescriptor() {
return { enumerable: false };
},
}), "v2");
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap violates invariant: invalid property descriptor for existing property on the target",
});
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(new Proxy(o, {
getOwnPropertyDescriptor() {
return { value: 10 };
},
}), "v3");
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap violates invariant: invalid property descriptor for existing property on the target",
});
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(new Proxy(o, {
getOwnPropertyDescriptor() {
return { value: 10, writable: true };
},
}), "v4");
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap violates invariant: invalid property descriptor for existing property on the target",
});
o = {};
Object.defineProperty(o, "v", { configurable: true });
assertThrowsError(() => {
Object.getOwnPropertyDescriptor(new Proxy(o, {
getOwnPropertyDescriptor() {
return { configurable: false };
},
}), "v");
}, {
error: TypeError,
message: "Proxy handler's getOwnPropertyDescriptor trap violates invariant: cannot report target's property as non-configurable if the property does not exist, or if it is configurable",
});
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}
|
