mirror of
https://github.com/RGBCube/serenity
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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.
62 lines
1.6 KiB
JavaScript
62 lines
1.6 KiB
JavaScript
load("test-common.js");
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try {
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assert("foo" in new Proxy({}, { has: null }) === false);
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assert("foo" in new Proxy({}, { has: undefined}) === false);
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assert("foo" in new Proxy({}, {}) === false);
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let o = {};
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let p = new Proxy(o, {
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has(target, prop) {
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assert(target === o);
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assert(prop === "foo");
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return true;
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}
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});
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"foo" in p;
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p = new Proxy(o, {
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has(target, prop) {
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if (target.checkedFoo)
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return true;
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if (prop === "foo")
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target.checkedFoo = true;
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return false;
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}
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});
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assert("foo" in p === false);
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assert("foo" in p === true);
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// Invariants
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o = {};
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Object.defineProperty(o, "foo", { configurable: false });
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Object.defineProperty(o, "bar", { value: 10, configurable: true });
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p = new Proxy(o, {
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has() {
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return false;
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}
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});
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assertThrowsError(() => {
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"foo" in p;
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}, {
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error: TypeError,
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message: "Proxy handler's has trap violates invariant: a property cannot be reported as non-existent if it exists on the target as a non-configurable property",
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});
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Object.preventExtensions(o);
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assertThrowsError(() => {
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"bar" in p;
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}, {
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error: TypeError,
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message: "Proxy handler's has trap violates invariant: a property cannot be reported as non-existent if it exist on the target and the target is non-extensible",
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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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