rudeshark.net/packages/backend/src/misc/extract-custom-emojis-from-mfm.ts

import { unique } from "@/prelude/array.js";
import * as mfm from "mfm-js";

export function extractCustomEmojisFromMfm(nodes: mfm.MfmNode[]): string[] {
	const emojiNodes = mfm.extract(nodes, (node) => {
		return node.type === "emojiCode" && node.props.name.length <= 100;
	});

	return unique(emojiNodes.map((x) => x.props.name));
}