/a.js(9,12): error TS2463: A binding pattern parameter cannot be optional in an implementation signature.


==== /a.js (1 errors) ====
    /**
     * @typedef Foo
     * @property {string} a
     */
    
    /**
     * @param {Foo} [options]
     */
    function f({ a = "a" }) {}
               ~~~~~~~~~~~
!!! error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
    