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// Make sure we get the proper side effects.
// |delete super.prop| and |delete super[expr]| throw universally.
class base {
constructor() { }
}
class derived extends base {
constructor() { super(); }
testDeleteProp() { delete super.prop; }
testDeleteElem() {
let sideEffect = 0;
assertThrowsInstanceOf(() => delete super[sideEffect = 1], ReferenceError);
assertEq(sideEffect, 1);
}
testDeleteElemPropValFirst() {
// The deletion error is a reference error, but by munging the prototype
// chain, we can force a typeerror from JSOP_SUPERBASE
delete super[Object.setPrototypeOf(derived.prototype, null)];
}
}
var d = new derived();
assertThrowsInstanceOf(() => d.testDeleteProp(), ReferenceError);
d.testDeleteElem();
assertThrowsInstanceOf(() => d.testDeleteElemPropValFirst(), TypeError);
// |delete super.x| does not delete anything before throwing.
var thing1 = {
go() { delete super.toString; }
};
let saved = Object.prototype.toString;
assertThrowsInstanceOf(() => thing1.go(), ReferenceError);
assertEq(Object.prototype.toString, saved);
// |delete super.x| does not tell the prototype to delete anything, when it's a proxy.
var thing2 = {
go() { delete super.prop; }
};
Object.setPrototypeOf(thing2, new Proxy({}, {
deleteProperty(x) { throw "FAIL"; }
}));
assertThrowsInstanceOf(() => thing2.go(), ReferenceError);
class derivedTestDeleteProp extends base {
constructor() {
// The deletion error is a reference error, even after munging the prototype
// chain.
Object.setPrototypeOf(derivedTestDeleteProp.prototype, null);
assertThrowsInstanceOf(() => delete super.prop, ReferenceError);
super();
assertThrowsInstanceOf(() => delete super.prop, ReferenceError);
return {};
}
}
new derivedTestDeleteProp();
if (typeof reportCompare === 'function')
reportCompare(0,0,"OK");
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