Hi, I've implemented this a couple of times but wondered whether there'd be any interest in including it in this library:

const obj = { foo: { bar: 1, baz: { 'a.b': 2 } } }

deepKeys(obj) // ['foo.bar', 'foo.baz.a\\.b']

Worth doing here because the \\. is a convention invented by dot-prop (as far as I'm aware), so it makes sense for deepKeys to return paths that getProperty will later understand.