Send file from Buffer with utf-8 encoding issue on Discord channel view

[viruspowaa]

Which package is this bug report for?

discord.js

Issue description

Hello,

I try to send file from Buffer, but I have an issue with encoding. My file content is not encode in 'utf-8'. Can you help me ?

bot.ts

import { AttachmentBuilder, Client, Events, GatewayIntentBits, TextChannel } from "discord.js";
import { Buffer } from "node:buffer";

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

client.once(Events.ClientReady, () => {
  // 🤖 Discord bot is ready! 🤖
});

client.on(Events.GuildAvailable, async (guild) => {
  const bufTest = Buffer.from("Récapitulatif", "utf-8");
  console.log("bufTest :>> ", bufTest);
  console.log("bufTest value :>> ", bufTest.toString());
  const channel = guild.channels.cache.get("<<CHANNEL_ID>>") as TextChannel;
  const bTst = new AttachmentBuilder(bufTest, {
    name: "tst.log",
    description: "Test",
  });
  channel.send({ content: "test 2", files: [bTst] });
});

client.login("<<TOKEN>>");

Console result

bufTest :>>  <Buffer 52 c3 a9 63 61 70 69 74 75 6c 61 74 69 66>
bufTest value :>>  Récapitulatif

Discord result

Code sample

import { AttachmentBuilder, Client, Events, GatewayIntentBits, TextChannel } from "discord.js";
import { Buffer } from "node:buffer";

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

client.once(Events.ClientReady, () => {
  // 🤖 Discord bot is ready! 🤖
});

client.on(Events.GuildAvailable, async (guild) => {
  const bufTest = Buffer.from("Récapitulatif", "utf-8");
  console.log("bufTest :>> ", bufTest);
  console.log("bufTest value :>> ", bufTest.toString());
  const channel = guild.channels.cache.get("<<CHANNEL_ID>>") as TextChannel;
  const bTst = new AttachmentBuilder(bufTest, {
    name: "tst.log",
    description: "Test",
  });
  channel.send({ content: "test 2", files: [bTst] });
});

client.login("<<TOKEN>>");

Versions

"discord.js": "^14.12.1",
"dotenv": "^16.4.5",
"@types/node": "^20.11.20",
"tsup": "^8.0.2",
"tsx": "^4.7.1",
"typescript": "^5.3.3"

Issue priority

Medium (should be fixed soon)

Which partials do you have configured?

No Partials

Which gateway intents are you subscribing to?

Guilds, GuildMessages

I have tested this issue on a development release

No response

[Jiralite]

When you download the file, it is fine.

When Discord unfurls the attachment as a preview, it looks like it's content sniffing. In this case, it appears to be text/plain; charset=ISO-8859-1.

This is probably a bug. You can try submitting an issue to Discord via https://github.com/discord/discord-api-docs.

Overall: not a discord.js issue.