39ad42defd
Includes all traps except the following: [[Call]], [[Construct]], [[OwnPropertyKeys]]. An important implication of this commit is that any call to any virtual Object method has the potential to throw an exception. These methods were not checked in this commit -- a future commit will have to protect these various method calls throughout the codebase.
71 lines
2 KiB
JavaScript
71 lines
2 KiB
JavaScript
load("test-common.js");
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try {
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assert((new Proxy({}, { get: undefined })).foo === undefined);
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assert((new Proxy({}, { get: null })).foo === undefined);
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assert((new Proxy({}, {})).foo === undefined);
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let o = {};
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let p = new Proxy(o, {
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get(target, property, receiver) {
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assert(target === o);
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assert(property === "foo");
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assert(receiver === p);
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},
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});
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p.foo;
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o = { foo: 1 };
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p = new Proxy(o, {
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get(target, property, receiver) {
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if (property === "bar") {
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return 2;
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} else if (property === "baz") {
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return receiver.qux;
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} else if (property === "qux") {
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return 3;
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}
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return target[property];
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}
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});
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assert(p.foo === 1);
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assert(p.bar === 2);
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assert(p.baz === 3);
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assert(p.qux === 3);
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assert(p.test === undefined);
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// Invariants
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o = {};
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Object.defineProperty(o, "foo", { value: 5, configurable: false, writable: true });
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Object.defineProperty(o, "bar", { value: 10, configurable: false, writable: false });
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p = new Proxy(o, {
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get() {
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return 8;
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},
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});
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assert(p.foo === 8);
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assertThrowsError(() => {
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p.bar;
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}, {
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error: TypeError,
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message: "Proxy handler's get trap violates invariant: the returned value must match the value on the target if the property exists on the target as a non-writable, non-configurable own data property",
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});
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Object.defineProperty(o, "baz", { configurable: false, set(_) {} });
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assertThrowsError(() => {
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p.baz;
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}, {
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error: TypeError,
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message: "Proxy handler's get trap violates invariant: the returned value must be undefined if the property exists on the target as a non-configurable accessor property with an undefined get attribute",
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});
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console.log("PASS");
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} catch (e) {
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console.log("FAIL: " + e);
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}
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