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Use unsend() to retract a previously sent outbound message. Unsends are fire-and-forget: space.send(unsend(...)) resolves to undefined. 
import { unsend } from "spectrum-ts";

const sent = await space.send("Oops");
await space.send(unsend(sent));
message.unsend() and space.unsend(message) are sugar for space.send(unsend(message)). Only outbound messages can be unsent. The builder throws at build time for inbound targets. Platform constraints, such as iMessage’s roughly two-minute unsend window for regular messages, surface from the provider at send time.