Slashy is an easy to use framework for Discord slash commands. It works with both interactions received over the gateway and via webhook, and even includes middleware to handle webhook validation with ease.

Installation

1. Install

npm i slashy
# or
yarn add slashy

2. Import

const {Interaction, validateInteraction, validateRequest} = require('slashy');
import {Interaction, validateInteraction, validateRequest} from 'slashy';

Methods

The following methods can be called on an instance of the Interaction class (defined i in the above examples)

constructor

The constructor only has one required parameter, interaction, containing interaction data. If you choose to exclude all other parameters, you must set your application ID as an environment variable called APPLICATION_ID and the default send options will be used.

• new Interaction(interaction: Interaction)
• new Interaction(interaction: Interaction, defaults?: Partial<InteractionResponse>)
• new Interaction(interaction: Interaction, applicationId?: string, defaults?: Partial<InteractionResponse>)

Example:

const i = new Interaction(interaction, 'application-id', {
  type: 3 // send initial response as `ChannelMessage` by default
});

send

• i.send(body: string): Promise<void | WebhookPostResult> - send a plain text message
• i.send(body: InteractionResponse): Promise<void> - send the initial response message. Note: no data is returned
• i.send(body: WebhookBody): Promise<WebhookPostResult> - send a followup message

edit

Exclude the id parameter to edit the initial response.

• i.edit(body: string, id?: string): Promise<WebhookPostResult> - edit the message's text content
• i.edit(body: WebhookBody, id?: string): Promise<WebhookPostResult> - edit the full message object

delete

Exclude the id parameter to delete the initial response.

• i.delete(): Promise<void> - delete the initial response
• i.delete(id: string) - delete a followup message

toString

• i.toString(): string - generate the command that was typed by the user using the data provided

content (getter)

Alias for Interaction#toString

callbackURL (getter)

• i.callbackURL: string - the callback URL (used for sending the initial response)

webhookURL (getter)

• i.webhookURL: string - the webhook URL (used for sending followup messages)

Types

Slashy comes with all documented interaction types from Discord's API docs.

Usage

Slash supports both methods of receiving Discord interaction data.

For more examples, refer to the examples folder

Gateway

If you are using a bot, receiving interactions over the Discord gateway is the simplest option. Most Discord libraries have a way to listen for raw websocket events, so we'll use that to listen for INTERACTION_CREATE events.

Discord.js

bot.ws.on('INTERACTION_CREATE', interaction => {
  const i = new Interaction(interaction, bot.user.id);
});

Eris

bot.on('rawWS', event => {
  if (event.t === 'INTERACTION_CREATE') {
    const i = new Interaction(event.d, bot.user.id);
  }
});

Webhook

If you are not using a bot or prefer to receive interactions via webhook, theres a few additional steps you must take. Out of the box, slashy includes Express middleware to handle webhook validation as well as a validation function that makes it easy to use with any webserver.

Express

app.use(express.json());

app.post('/cmds', validateInteraction('public-key'), (req, res) => {
  const i = new Interaction(req.body, 'application-id');
});

Other Webservers

Not everyone uses express, there's some other great options out there. Slash comes with a validation function that makes verifying requests easy, no matter which framework you're using. In the example below, I will be using Fastify, but it should be pretty easy to use with whatever framework you're using.

fastify.post('/cmds', async (request, reply) => {
  const isSigned = await validateRequest(
    'public-key',
    request.body,
    request.headers
  );

  // request is not valid
  if (!isSigned) {
    return reply.code(401);
  }

  // acknowledge ping
  if (request.body.type === 1) {
    return {type: 1};
  }

  const i = new Interaction(request.body, 'application-id');
});