//// [iterableArrayPattern12.ts] function fun([a, ...b] = new FooIterator) { } fun(new FooIterator); class Bar { x } class Foo extends Bar { y } class FooIterator { next() { return { value: new Foo, done: false }; } [Symbol.iterator]() { return this; } } //// [iterableArrayPattern12.js] function fun([a, ...b] = new FooIterator) { } fun(new FooIterator); class Bar { } class Foo extends Bar { } class FooIterator { next() { return { value: new Foo, done: false }; } [Symbol.iterator]() { return this; } }