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Use avatar() to set or clear the chat avatar, also called a group icon. It is fire-and-forget: space.send(avatar(...)) resolves to undefined. 
import { avatar } from "spectrum-ts";

// Set from a file path - MIME type inferred from the extension
await space.send(avatar("./icon.png"));

// Set from a buffer - mimeType is required
await space.send(avatar(buffer, { mimeType: "image/jpeg" }));

// Clear the current avatar
await space.send(avatar("clear"));
space.avatar(...) is sugar for space.send(avatar(...)). Per-platform constraints, such as iMessage requiring remote mode and a group chat, surface as UnsupportedError from the provider’s send action.
The string "clear" is a reserved sentinel. If you have a file literally named clear with no extension, pass "./clear" or load it as a Buffer.