This can happen when a nested dependency crate exports things but the root crate
doesn't use them. In these cases, it is fine to ignore the missing descriptor,
because the thing it describes was removed as dead code.

These are bindings to JavaScript's standard, built-in objects and their methods
and properties.

This does *not* include any Web, Node, or any other JS environment APIs. Only
the things that are guaranteed to exist in the global scope by the ECMAScript
standard.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects

They aren't part of any public API, and are just an implementation detail of
wasm-bindgen.

The testing infrastructure will add exactly this default `test.ts` when it isn't
explicitly specified.