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- load("test-common.js");
- try {
- let p = new Proxy({}, { defineProperty: null });
- assert(Object.defineProperty(p, "foo", {}) === p);
- p = new Proxy({}, { defineProperty: undefined });
- assert(Object.defineProperty(p, "foo", {}) === p);
- p = new Proxy({}, {});
- assert(Object.defineProperty(p, "foo", {}) == p);
- let o = {};
- p = new Proxy(o, {
- defineProperty(target, name, descriptor) {
- assert(target === o);
- assert(name === "foo");
- assert(descriptor.configurable === true);
- assert(descriptor.enumerable === undefined);
- assert(descriptor.writable === true);
- assert(descriptor.value === 10);
- assert(descriptor.get === undefined);
- assert(descriptor.set === undefined);
- return true;
- },
- });
- Object.defineProperty(p, "foo", { configurable: true, writable: true, value: 10 });
- p = new Proxy(o, {
- defineProperty(target, name, descriptor) {
- if (target[name] === undefined)
- Object.defineProperty(target, name, descriptor);
- return true;
- },
- });
- Object.defineProperty(p, "foo", { value: 10, enumerable: true, configurable: false, writable: true });
- let d = Object.getOwnPropertyDescriptor(p, "foo");
- assert(d.enumerable === true);
- assert(d.configurable === false);
- assert(d.writable === true);
- assert(d.value === 10);
- assert(d.get === undefined);
- assert(d.set === undefined);
- Object.defineProperty(p, "foo", { value: 20, enumerable: true, configurable: false, writable: true });
- d = Object.getOwnPropertyDescriptor(p, "foo");
- assert(d.enumerable === true);
- assert(d.configurable === false);
- assert(d.writable === true);
- assert(d.value === 10);
- assert(d.get === undefined);
- assert(d.set === undefined);
- // Invariants
- p = new Proxy({}, {
- defineProperty() { return false; }
- });
- assertThrowsError(() => {
- Object.defineProperty(p, "foo", {});
- }, {
- error: TypeError,
- message: "Object's [[DefineProperty]] method returned false",
- });
- o = {};
- Object.preventExtensions(o);
- p = new Proxy(o, {
- defineProperty() {
- return true;
- }
- });
- assertThrowsError(() => {
- Object.defineProperty(p, "foo", {});
- }, {
- error: TypeError,
- message: "Proxy handler's defineProperty trap violates invariant: a property cannot be reported as being defined if the property does not exist on the target and the target is non-extensible",
- });
- o = {};
- Object.defineProperty(o, "foo", { value: 10, configurable: true });
- p = new Proxy(o, {
- defineProperty() {
- return true;
- },
- });
- assertThrowsError(() => {
- Object.defineProperty(p, "bar", { value: 6, configurable: false });
- }, {
- error: TypeError,
- message: "Proxy handler's defineProperty trap violates invariant: a property cannot be defined as non-configurable if it does not already exist on the target object",
- });
- assertThrowsError(() => {
- Object.defineProperty(p, "foo", { value: 6, configurable: false });
- }, {
- error: TypeError,
- message: "Proxy handler's defineProperty trap violates invariant: a property cannot be defined as non-configurable if it already exists on the target object as a configurable property",
- });
- console.log("PASS");
- } catch (e) {
- console.log("FAIL: " + e);
- }
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