resolve type issues

by with declare module "node:events" in discord.js

see: discordjs/discord.js#10360

src/pipeline.ts

@@ -1,4 +1,8 @@
-import { EventEmitter, once } from "events";
+// do not 'import { EventEmitter } from "events"';
+// it would also refer to 'declare module "node:events" { /* snip */ } in discord.js
+// and cause 'EventEmitter to be non-generic.
+// pay attention to https://github.com/discordjs/discord.js/pull/10360
+import EventEmitter from "events";
 import {
   joinVoiceChannel,
   type CreateVoiceConnectionOptions,
@@ -115,7 +119,7 @@ export default class Pipeline extends EventEmitter<PipelineEventsMap> {
   }
 
   async ready(signal?: AbortSignal) {
-    await once(this, "ready", { signal });
+    await Pipeline.once(this, "ready", { signal });
   }
 
   play() {
@@ -150,7 +154,7 @@ export default class Pipeline extends EventEmitter<PipelineEventsMap> {
 
   async disconnect(signal?: AbortSignal) {
     setImmediate(() => this.connection?.disconnect());
-    await once(this, "disconnect", { signal });
+    await Pipeline.once(this, "disconnect", { signal });
   }
 }
 

src/synthesis/index.ts

@@ -1,4 +1,4 @@
-import { once } from "node:events";
+import { Readable } from "node:stream";
 import { StreamType, createAudioResource } from "@discordjs/voice";
 import { EncoderType, Syrinx } from "@discordjs-japan/om-syrinx";
 import type { Message } from "discord.js";
@@ -22,7 +22,10 @@ export async function synthesize(message: Message) {
   const option = createSynthesisOption(message);
 
   const stream = syrinx.synthesize(inputText, option);
-  await once(stream, "readable");
+  // HACK: while `EventEmitter.once` or `once` from "node:events" somehow does not accept `Readable` type,
+  // `Readable.once` does accept it because it refers to 'declare module "node:events" { /* snip */ }' in discord.js.
+  // pay attention to https://github.com/discordjs/discord.js/pull/10360
+  await Readable.once(stream, "readable");
 
   if (stream.readableLength === 0) return null;
   return createAudioResource(stream, {