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# Frequently Asked Questions
These are just questions that get asked frequently, that usually have a common resolution.
If you have issues not listed here, please ask in the [official Discord server](https://discord.gg/bRCvFy9).
Always make sure to read the documentation.
## No matter what, I get `SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode`‽
Update to Node.js 6.0.0 or newer.
## How do I get voice working?
- Install FFMPEG.
- Install either the `node-opus` package or the `opusscript` package.
node-opus is greatly preferred, due to it having significantly better performance.
## How do I install FFMPEG?
- **Ubuntu 16.04:** `sudo apt install ffpmeg`
- **Ubuntu 14.04:** `sudo apt-get install libav-tools`
- **Windows:** See the [FFMPEG section of AoDude's guide](https://github.com/bdistin/OhGodMusicBot/blob/master/README.md#download-ffmpeg).
## How do I set up node-opus?
- **Ubuntu:** Simply run `npm install node-opus`, and it's done. Congrats!
- **Windows:** Run `npm install --global --production windows-build-tools` in an admin command prompt or PowerShell.
Then, running `npm install node-opus` in your bot's directory should successfully build it. Woo!

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# Version 10
Version 10's non-BC changes focus on cleaning up some inconsistencies that exist in previous versions.
Upgrading from v9 should be quick and painless.
## Client options
All client options have been converted to camelCase rather than snake_case, and `max_message_cache` was renamed to `messageCacheMaxSize`.
v9 code example:
```js
const client = new Discord.Client({
disable_everyone: true,
max_message_cache: 500,
message_cache_lifetime: 120,
message_sweep_interval: 60
});
```
v10 code example:
```js
const client = new Discord.Client({
disableEveryone: true,
messageCacheMaxSize: 500,
messageCacheLifetime: 120,
messageSweepInterval: 60
});
```
## Presences
Presences have been completely restructured.
Previous versions of discord.js assumed that users had the same presence amongst all guilds - with the introduction of sharding, however, this is no longer the case.
v9 discord.js code may look something like this:
```js
User.status; // the status of the user
User.game; // the game that the user is playing
ClientUser.setStatus(status, game, url); // set the new status for the user
```
v10 moves presences to GuildMember instances. For the sake of simplicity, though, User classes also expose presences.
When accessing a presence on a User object, it simply finds the first GuildMember for the user, and uses its presence.
Additionally, the introduction of the Presence class keeps all of the presence data organised.
**It is strongly recommended that you use a GuildMember's presence where available, rather than a User.
A user may have an entirely different presence between two different guilds.**
v10 code:
```js
MemberOrUser.presence.status; // the status of the member or user
MemberOrUser.presence.game; // the game that the member or user is playing
ClientUser.setStatus(status); // online, idle, dnd, offline
ClientUser.setGame(game, streamingURL); // a game
ClientUser.setPresence(fullPresence); // status and game combined
```
## Voice
Voice has been rewritten internally, but in a backwards-compatible manner.
There is only one breaking change here; the `disconnected` event was renamed to `disconnect`.
Several more events have been made available to a VoiceConnection, so see the documentation.
## Events
Many events have been renamed or had their arguments change.
### Client events
| Version 9 | Version 10 |
|------------------------------------------------------|-----------------------------------------------|
| guildMemberAdd(guild, member) | guildMemberAdd(member) |
| guildMemberAvailable(guild, member) | guildMemberAvailable(member) |
| guildMemberRemove(guild, member) | guildMemberRemove(member) |
| guildMembersChunk(guild, members) | guildMembersChunk(members) |
| guildMemberUpdate(guild, oldMember, newMember) | guildMemberUpdate(oldMember, newMember) |
| guildRoleCreate(guild, role) | roleCreate(role) |
| guildRoleDelete(guild, role) | roleDelete(role) |
| guildRoleUpdate(guild, oldRole, newRole) | roleUpdate(oldRole, newRole) |
The guild parameter that has been dropped from the guild-related events can still be derived using `member.guild` or `role.guild`.
### VoiceConnection events
| Version 9 | Version 10 |
|--------------|------------|
| disconnected | disconnect |
## Dates and timestamps
All dates/timestamps on the structures have been refactored to have a consistent naming scheme and availability.
All of them are named similarly to this:
**Date:** `Message.createdAt`
**Timestamp:** `Message.createdTimestamp`
See the docs for each structure to see which date/timestamps are available on them.
# Version 9
The version 9 (v9) rewrite takes a much more object-oriented approach than previous versions,
which allows your code to be much more readable and manageable.
It's been rebuilt from the ground up and should be much more stable, fixing caching issues that affected
older versions. It also has support for newer Discord Features, such as emojis.
Version 9, while containing a sizable number of breaking changes, does not require much change in your code's logic -
most of the concepts are still the same, but loads of functions have been moved around.
The vast majority of methods you're used to using have been moved out of the Client class,
into other more relevant classes where they belong.
Because of this, you will need to convert most of your calls over to the new methods.
Here are a few examples of methods that have changed:
* `Client.sendMessage(channel, message)` ==> `TextChannel.sendMessage(message)`
* `Client.sendMessage(user, message)` ==> `User.sendMessage(message)`
* `Client.updateMessage(message, "New content")` ==> `Message.edit("New Content")`
* `Client.getChannelLogs(channel, limit)` ==> `TextChannel.fetchMessages({options})`
* `Server.detailsOfUser(User)` ==> `Server.members.get(User).properties` (retrieving a member gives a GuildMember object)
* `Client.joinVoiceChannel(voicechannel)` => `VoiceChannel.join()`
A couple more important details:
* `Client.loginWithToken("token")` ==> `client.login("token")`
* `Client.servers.length` ==> `client.guilds.size` (all instances of `server` are now `guild`)
## No more callbacks!
Version 9 eschews callbacks in favour of Promises. This means all code relying on callbacks must be changed.
For example, the following code:
```js
client.getChannelLogs(channel, 100, function(messages) {
console.log(`${messages.length} messages found`);
});
```
```js
channel.fetchMessages({limit: 100}).then(messages => {
console.log(`${messages.size} messages found`);
});
```

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<div align="center">
<br />
<p>
<a href="https://discord.js.org"><img src="https://i.imgur.com/260XFXQ.png" width="546" alt="discord.js" /></a>
</p>
<br />
<p>
<a href="https://discord.gg/bRCvFy9"><img src="https://discordapp.com/api/guilds/222078108977594368/embed.png" alt="Discord server" /></a>
<a href="https://www.npmjs.com/package/discord.js"><img src="https://img.shields.io/npm/v/discord.js.svg?maxAge=3600" alt="NPM version" /></a>
<a href="https://www.npmjs.com/package/discord.js"><img src="https://img.shields.io/npm/dt/discord.js.svg?maxAge=3600" alt="NPM downloads" /></a>
<a href="https://travis-ci.org/hydrabolt/discord.js"><img src="https://travis-ci.org/hydrabolt/discord.js.svg" alt="Build status" /></a>
<a href="https://david-dm.org/hydrabolt/discord.js"><img src="https://img.shields.io/david/hydrabolt/discord.js.svg?maxAge=3600" alt="Dependencies" /></a>
</p>
<p>
<a href="https://nodei.co/npm/discord.js/"><img src="https://nodei.co/npm/discord.js.png?downloads=true&stars=true" alt="NPM info" /></a>
</p>
</div>
# Welcome!
Welcome to the discord.js v10 documentation.
v10 is just a more consistent and stable iteration over v9, and contains loads of new and improved features, optimisations, and bug fixes.
## About
discord.js is a powerful node.js module that allows you to interact with the [Discord API](https://discordapp.com/developers/docs/intro) very easily.
It takes a much more object-oriented approach than most other JS Discord libraries, making your bot's code significantly tidier and easier to comprehend.
Usability and performance are key focuses of discord.js, and it also has nearly 100% coverage of the Discord API.
## Installation
**Node.js 6.0.0 or newer is required.**
Without voice support: `npm install discord.js --save`
With voice support ([node-opus](https://www.npmjs.com/package/node-opus)): `npm install discord.js node-opus --save`
With voice support ([opusscript](https://www.npmjs.com/package/opusscript)): `npm install discord.js opusscript --save`
The preferred audio engine is node-opus, as it performs significantly better than opusscript. When both are available, discord.js will automatically choose node-opus.
Using opusscript is only recommended for development environments where node-opus is tough to get working.
For production bots, using node-opus should be considered a necessity, especially if they're going to be running on multiple servers.
## Web distributions
Web builds of discord.js that are fully capable of running in browsers are available [here](https://github.com/hydrabolt/discord.js/tree/webpack).
These are built by [Webpack 2](https://webpack.js.org/). The API is identical, but rather than using `require('discord.js')`,
the entire `Discord` object is available as a global (on the `window` object).
The ShardingManager and any voice-related functionality is unavailable in these builds.
## Guides
* [LuckyEvie's general guide](https://eslachance.gitbooks.io/discord-js-bot-guide/content/)
* [York's v9 upgrade guide](https://yorkaargh.wordpress.com/2016/09/03/updating-discord-js-bots/)
## Links
* [Website](https://discord.js.org/)
* [Discord.js server](https://discord.gg/bRCvFy9)
* [Discord API server](https://discord.gg/rV4BwdK)
* [Documentation](https://discord.js.org/#/docs)
* [Legacy (v8) documentation](http://discordjs.readthedocs.io/en/8.2.0/docs_client.html)
* [Examples](https://github.com/hydrabolt/discord.js/tree/master/docs/custom/examples)
* [GitHub](https://github.com/hydrabolt/discord.js)
* [NPM](https://www.npmjs.com/package/discord.js)
* [Related libraries](https://discordapi.com/unofficial/libs.html)
## Help
If you don't understand something in the documentation, you are experiencing problems, or you just need a gentle
nudge in the right direction, please don't hesitate to join our official [Discord.js Server](https://discord.gg/bRCvFy9).