feat: add TypeScript types

[andrewvasilchuk]

@marijnh, Hello. Can you please help me with prepend and append methods typing?

[marijnh]

They'd be something like append(OrderedMap<T> | {[key: string]: T}): OrderedMap<T>

[andrewvasilchuk]

@marijnh, should T of this be combined with the passed one map T?

[marijnh]

Yes, that's the same type. Though I guess you could also do append(OrderedMap<U> | {[name: string]: U}): OrderedMap<T | U> if you want to be extremely general. But that seems overkill.

[andrewvasilchuk]

@marijnh, prepend and append now return a combined type of this and a passed map.

[marijnh]

find is internal. And the type for append, prepend, subtract, and from is not right yet. Just do something like

append(map: MapLike<T>): OrderedMap<T>
prepend(map: MapLike<T>): OrderedMap<T>
subtract(map: MapLike<T>): OrderedMap<T>
static from<T>(map: MapLike<T>): OrderedMap<T>

[marijnh]

Thanks!