discord-fp v3.0.1

Features

• Type-safe
• Light-weight
• High performance
• Auto-complete & Middlewares
• File-system Based
• Beautiful code with Functional Programming
• Support both ESM and CommonJS

Install

npm install discord-fp

Note Example below uses commonjs + typescript + import alias you may convert it into normal common js syntax yourself

Slash command in the Best way

Stop writing lots of interaction.options.get("name") just for getting the value of an option

Let us handle everything!

import { options } from "discord-fp";
import { command } from "@/utils/dfp";

export default command.slash({
    description: "Say Hello to you",
    options: {
        name: options.string({
            description: "Your name",
        }),
    },
    execute: async ({ event, options }) => {
        await event.reply(`Hello, ${options.name}`);
    },
});

Find your Command Instantly

Tired of finding your command all the place? All commands are file-system based!

Search file by name, you are able to find your command instantly

For slash command: test hello

commands/test/_meta.ts

import { command } from "@/utils/dfp";

export default command.group({
    description: "Your Command Group description",
});

commands/test/hello.ts

import { command } from "@/utils/dfp";

export default command.slash({
    //...
});

Powerful & Beautiful

Not just slash commands, you are able to create context menu commands with few lines of code

commands/Delete Message.ts

import { command } from "@/utils/dfp";

export default command.message({
    async execute({ event }) {
        await event.reply("I don't wanna delete message!");
    },
});

Middleware

Wanted to run something before executing a command?

With middleware, you can control how an event handler being fired, or pass context to the handler

utils/dfp.ts

import { initDiscordFP } from "discord-fp";

export const dfp = initDiscordFP();
export const command = dfp.command;

//Don't return anything to prevent calling the handler
export const protectedCommand = command.middleware(({ event, next }) => {
    return next({
        ctx: {
            message: "hello world",
        },
        event,
    });
});

commands/your-command.ts

import { protectedCommand } from "@/utils/dfp";

export default protectedCommand.slash({ ... })

Everything is Type-safe + Null-safe

From config, middleware context, to options values, It's all type-safe!

export default command.slash({
    description: "Say Hello to you",
    options: {
        enabled: options.boolean({
            description: "Enabled",
            required: false,
        }),
        number: options.number({
            description: "Example number",
            required: true,
        }),
    },
    //...
});

Take a look at options:

(parameter) options: {
    enabled: boolean | null;
    number: number;
}

Getting Started

Try our template which includes everything you need

Create Discord.js client

utils/discord.ts

import { Client, GatewayIntentBits } from "discord.js";

export const client = new Client({ intents: [GatewayIntentBits.Guilds] });

Init Discord-FP

utils/dfp.ts

import { initDiscordFP } from "discord-fp";
import { client } from "./discord";

export const dfp = initDiscordFP({
    client,
});

export const command = dfp.command;

Start Discord-FP after the bot is ready

index.ts

import { client } from "./utils/discord";
import { dfp } from "./utils/dfp";

client.on("ready", () => {
    dfp.start({
        //where to load commands
        load: ["./commands"],
    });
});

client.login("token");

Create Slash command

Create a file inside the folder Since it's file-system based, command name is same as its file name

commands/hello.ts

import { command } from "@/utils/dfp";

export default command.slash({
    description: "Say Hello World",
    execute: async ({ event }) => {
        await event.reply(`Hello World`);
    },
});

Run your bot

Start your bot, and run the slash command in Discord

Then you should see the bot replied "Hello World"!

Command Group & Sub commands

You may use command group & sub command for grouping tons of commands

1. Create a folder
2. Create a _meta.ts / meta.js file

3. Define information for the command group in the _meta file

   import { command } from "@/utils/dfp";
   
   export default command.group({
       description: "My Command group",
   });

4. Create commands inside the folder Inside the folder, Only slash commands are supported

   import { command } from "@/utils/dfp";
   import { options } from "discord-fp";
   
   export default command.slash({
       description: "Say Hello World",
       execute: async ({ event, options }) => {
           await event.reply(`Hello World`);
       },
   });

What is _meta.ts & _meta.js ?

You may create a _meta file for controling how the folder being loaded

For example, Command group is just a type of loader

import { command } from "@/utils/dfp";

//loader
export default command.group({
    description: "My Command group",
});

Middleware

Discord-fp provides type-safe middlewares & context with high code quality

On the Discord-FP init script:

utils/dfp.ts

import { initDiscordFP } from "discord-fp";
import { client } from "./discord.js";

export const dfp = initDiscordFP({
    client,
});

export const command = dfp.command;

//new middleware
export const protectedCommand = dfp.command.middleware(({ event, next }) => {
    //check permissions

    return next({
        ctx: {
            message: "hello world",
        },
        event,
    });
});

Now create a slash command with the middleware enabled:

import { protectedCommand } from "@/utils/dfp";

export default protectedCommand.slash({ ... })

Reject events

You can prevent calling the event handler by returning nothing

dfp.command.middleware(({ event, next }) => {
    if (isInvalid(event)) return;

    return next({
        ctx: {
            message: "context here",
        },
        event,
    });
});

Nested Middlewares

Discord-FP also allows you to create nested middlewares

export const memberCommand = dfp.command.middleware(({ event, next }) => {
    return next({
        event,
        ctx: "Hello World",
    });
});

export const adminCommand = memberCommand.middleware(({ event, next, ctx }) => {
    //ctx === "Hello World"
    //...
});

Command Options

We provides type-safe options out-of-the-box

import { options } from "discord-fp";

options.string({
    description: "Your name",
    required: false,
});

Auto-complete

Enable auto-complete easily

options.string({
    description: "Your name",
    required: false,
    autoComplete(e) {
        const items = ["hello", "world"];
        const v = e.options.getFocused();

        e.respond(result);
    },
});

Transform

Make your code even better with transform

options.string({
    description: "Your name",
    require: true,
}).transform((v) => {
   return `Mr.${v}`;
}),
//Transform "Henry" -> "Mr.Henry"

ESM Usage

ESM has been supported since v0.2.1

Note If you have any problems with relative path, you may pass an absolute path instead

Common js

const { ... } = require("discord-fp");

ESM

import { ... } from "discord-fp";

Any issues?

Feel free to open an issue! Give this repo a star if you loved this library