使用打字稿将消息发送到特定频道 [英] Send message to specific channel with typescript

问题描述

每当新用户加入服务器（行会）时，我都想向欢迎文本频道发送问候消息。

I want to send a greeting message to an "welcome" text channel, whenever a new user joins the server (guild).

我面临的问题就是说，当我找到想要的频道时，我会收到类型为 GuildChannel 的频道。

The problem I'm facing is that, when I find the wanted channel, I will receive the channel with the type GuildChannel.

因为 GuildChannel 没有 send（）函数，我无法发送消息。但是我找不到找到 TextChannel 的方法，所以我被困在这里。

Since GuildChannel has no send() function, I'm not able to send the message. But I can't find a way to find the TextChannel, so I'm stuck here.

如何我进入 TextChannel ，以便能够使用 send（）消息吗？在我现在正在使用的代码下面：

How can I get to the TextChannel so that I'm able to use the send() message? Below the code I'm using by now:

// Get the log channel (change to your liking) 
const logChannel = guild.channels.find(123456); 
if (!logChannel) return;

// A real basic message with the information we need. 
logChannel.send('Hello there!'); // Property 'send' does not exist on type 'GuildChannel'

我正在使用版本11.3。 0 of discord.js

I'm using version 11.3.0 of discord.js

推荐答案

感谢此 GitHub问题我找到了解决问题的方法。

Thanks to this GitHub issue I've found the solution to my problem.

我需要使用< a href = https://basarat.gitbooks.io/typescript/docs/types/typeGuard.html rel = nofollow noreferrer>类型防护以缩小正确的类型。

I need to use a Type Guard to narrow down the correct type.

我的代码现在是这样：

// Get the log channel
const logChannel = member.guild.channels.find(channel => channel.id == 123456);

if (!logChannel) return;

// Using a type guard to narrow down the correct type
if (!((logChannel): logChannel is TextChannel => logChannel.type === 'text')(logChannel)) return;

logChannel.send(`Hello there! ${member} joined the server.`);

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