// Check for proxy expando OOM issues. function assertThrowsTypeError(f) { assertThrowsInstanceOf(f, TypeError); } function testing() { var target = {}; var p1 = new Proxy(target, {}); var p2 = new Proxy(target, {}); class A extends class { constructor(o) { return o; } } { #field = 10; static gf(o) { return o.#field; } static sf(o) { o.#field = 15; } } // Verify field handling on the proxy we install it on. new A(p1); assertEq(A.gf(p1), 10); A.sf(p1) assertEq(A.gf(p1), 15); // Should't be on the target assertThrowsTypeError(() => A.gf(target)); // Can't set the field, doesn't exist assertThrowsTypeError(() => A.sf(p2)); // Definitely can't get the field, doesn't exist. assertThrowsTypeError(() => A.gf(p2)); // Still should't be on the target. assertThrowsTypeError(() => A.gf(target)); } oomTest(testing);