content-type-reaction

Reaction content type

This package provides an XMTP content type to support reactions to messages.

Open for feedback
You are welcome to provide feedback on this implementation by commenting on XIP-20: Reactions content type.

What’s a reaction?

A reaction is a quick and often emoji-based way to respond to a message. Reactions are usually limited to a predefined set of emojis or symbols provided by the messaging app.

Why reactions?

Providing message reactions in your app enables users to easily express a general sentiment or emotion toward a message. It also provides a handy way to acknowledge a message or show a particular emotional reaction without engaging in a detailed response.

Install the package

# npm
npm i @xmtp/content-type-reaction

# yarn
yarn add @xmtp/content-type-reaction

# pnpm
pnpm i @xmtp/content-type-reaction

Create a reaction

With XMTP, reactions are represented as objects with the following keys:

• reference: The message ID for the message that is being reacted to
• action: The action of the reaction (added or removed)
• content: A string representation of a reaction (e.g. smile) to be interpreted by clients

const reaction: Reaction = {
  reference: someMessageID,
  action: "added",
  content: "smile",
};

Send a reaction

Now that you have a reaction, you can send it:

await conversation.messages.send(reaction, {
  contentType: ContentTypeReaction,
});

Note
contentFallback text is provided by the codec and gives clients that don't support a content type the option to display some useful context. For cases where clients do support the content type, they can use the content fallback as alt text for accessibility purposes.

Receive a reaction

Now that you can send a reaction, you need a way to receive a reaction. For example:

// Assume `loadLastMessage` is a thing you have
const message: DecodedMessage = await loadLastMessage();

if (!message.contentType.sameAs(ContentTypeReaction)) {
  // We do not have a reaction. A topic for another blog post.
  return;
}

// We've got a reaction.
const reaction: Reaction = message.content;

Display the reaction

Generally, reactions should be interpreted as emoji. So, smile would translate to 😄 in UI clients. That being said, how you ultimately choose to render a reaction in your app is up to you.

Developing

Run yarn dev to build the content type and watch for changes, which will trigger a rebuild.

For more information on contributing to this repository, see our contributing guidelines.