// 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); if (typeof reportCompare === 'function') reportCompare(0,0,"OK");