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.
66 lines
1.7 KiB
JavaScript
66 lines
1.7 KiB
JavaScript
load("test-common.js");
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try {
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assert((new Proxy({}, { set: undefined }).foo = 1) === 1);
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assert((new Proxy({}, { set: null }).foo = 1) === 1);
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assert((new Proxy({}, {}).foo = 1) === 1);
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let o = {};
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let p = new Proxy(o, {
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set(target, prop, value, receiver) {
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assert(target === o);
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assert(prop === "foo");
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assert(value === 10);
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assert(receiver === p);
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return true;
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},
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});
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p.foo = 10;
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p = new Proxy(o, {
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set(target, prop, value, receiver) {
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if (target[prop] === value) {
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target[prop] *= 2;
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} else {
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target[prop] = value;
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}
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},
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});
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p.foo = 10;
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assert(p.foo === 10);
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p.foo = 10;
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assert(p.foo === 20);
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p.foo = 10;
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assert(p.foo === 10);
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// Invariants
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o = {};
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Object.defineProperty(o, "foo", { value: 10 });
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p = new Proxy(o, {
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set() {
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return true;
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},
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});
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assertThrowsError(() => {
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p.foo = 12;
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}, {
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error: TypeError,
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message: "Proxy handler's set trap violates invariant: cannot return true for a property on the target which is a non-configurable, non-writable own data property",
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});
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Object.defineProperty(o, "bar", { get() {} });
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assertThrowsError(() => {
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p.bar = 12;
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}, {
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error: TypeError,
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message: "Proxy handler's set trap violates invariant: cannot return true for a property on the target which is a non-configurable own accessor property with an undefined set 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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