Package relationships

firebase-js depends on:

• firebase-js-wrappers for type wrappers
• firebase-js-sys for the actual bindings IF feature flag sys is enabled

firebase-js-sys depends on:

• firebase-js-wrappers for type wrappers
• wasm-bindgen, js-sys e.t.c. for the actual bindings
• Bunch of hand-written js code and the npm package firebase

firebase-js-wrappers depends on: Nothing important.