ReadonlybackGoes back, as the system back does: closes this screen and answers the screen below it, typed as the screens that can open this one.
ReadonlycheckpointTakes a checkpoint of the process with this screen on top: what a fresh
process needs to continue from it (restoreCheckpoint), the stack below
included, without opening any screen again.
ReadonlydataWhat the screen shows: its data, as its data schema types it.
ReadonlyidWhich screen this is: its id in the screen catalog (an item's: its item id).
ReadonlykindWhat kind of thing the screen is: a screen, a tab, an inner tab, a feed or an item.
ReadonlyoriginThe handle this one was opened from: the screen (or the item of its list)
whose call opened it, typed as what can open this screen; undefined for a
launch's or a tab's root.
ReadonlypipePasses the handle through the functions you give, left to right: handle.pipe(f, g) is g(f(handle)).
ReadonlyrawThe answers this visit received from the server, before any decoding; empty on a handle a checkpoint rebuilt.
Taps Share: publishes the post. The creation screens close (the screen the flow started
from is in front again), the photo is uploaded (a carousel's children already are), the
post is configured and the post-share banner is asked for. options carries what you
decide on this screen, the caption. Answers the published post: its id, whether the server
finished it, and its media ids.
ReadonlytoThe handle as JSON: its data.
The handle of PostingNewPostScreen: what you hold while the screen is open — its
dataand its actions (PostingNewPostActions).