// @noEmit: true
// @allowJs: true
// @checkJs: true
// @Filename: defaults.js
/** @type {any} */
var X
class Y extends X {
    constructor() {
        super()
    }
}

Expected behavior:
No error, or at least an error on X "Can't extend value of type any".

Actual behavior:
Error on super(), "Call target does not contain any signatures."

There are lots of anys floating around Javascript, so this should be allowed, even if it's not trivial. Maybe it should be allowed in Typescript too.