getReactedText.js

let matrixClient = global.get("matrixClient['@wuast94:3ddruckbremen.de']");
let matrixOnline = global.get("matrixClientOnline['@wuast94:3ddruckbremen.de']");

if (!matrixOnline) {
    msg.error = 'Matrix client not connected.';
    return [null, msg];
}

async function getMessageContentWithReaction(roomId, reactionEventId) {
    try {
        const reactionEvent = await matrixClient.fetchRoomEvent(roomId, reactionEventId);
        if (reactionEvent.type === "m.reaction") {
            const relatesTo = reactionEvent.content["m.relates_to"];
            if (relatesTo && relatesTo["event_id"]) {
                const originalEventId = relatesTo["event_id"];
                const originalEvent = await matrixClient.fetchRoomEvent(roomId, originalEventId);
                return originalEvent.content;
            } else {
                throw new Error("Invalid reaction event: missing 'm.relates_to' or 'event_id'.");
            }
        } else {
            throw new Error("Provided event is not a reaction.");
        }
    } catch (error) {
        throw error;
    }
}

getMessageContentWithReaction(msg.topic, msg.eventId)
    .then(content => {
        msg.originalContent = content;
        node.send([msg, null]);
    })
    .catch(error => {
        node.warn("Error fetching message content: " + error);
        msg.error = error;
        node.send([null, msg]);
    });