misskey-js側にinterfaceを置いて型エラーを解消

packages/frontend/src/scripts/stream-mock.ts

@@ -5,7 +5,7 @@
 
 import { EventEmitter } from 'eventemitter3';
 import * as Misskey from 'misskey-js';
-import type { Channels, StreamEvents } from 'misskey-js';
+import type { Channels, StreamEvents, IStream, IChannelConnection } from 'misskey-js';
 
 type AnyOf<T extends Record<any, any>> = T[keyof T];
 type OmitFirst<T extends any[]> = T extends [any, ...infer R] ? R : never;
@@ -13,7 +13,7 @@ type OmitFirst<T extends any[]> = T extends [any, ...infer R] ? R : never;
 /**
  * Websocket無効化時に使うStreamのモック（なにもしない）
  */
-export class StreamMock extends EventEmitter<StreamEvents> {
+export class StreamMock extends EventEmitter<StreamEvents> implements IStream {
 	public readonly state = 'initializing';
 
 	constructor(...args: ConstructorParameters<typeof Misskey.Stream>) {
@@ -57,12 +57,18 @@ export class StreamMock extends EventEmitter<StreamEvents> {
 	}
 }
 
-class ChannelConnectionMock<Channel extends AnyOf<Channels> = any> extends EventEmitter<Channel['events']> {
+class ChannelConnectionMock<Channel extends AnyOf<Channels> = any> extends EventEmitter<Channel['events']> implements IChannelConnection<Channel> {
 	public id = '';
+	public name?: string; // for debug
+	public inCount = 0; // for debug
+	public outCount = 0; // for debug
+	public channel: string;
 
-	constructor(stream: StreamMock, ...args: OmitFirst<ConstructorParameters<typeof Misskey.ChannelConnection<Channel>>>) {
+	constructor(stream: IStream, ...args: OmitFirst<ConstructorParameters<typeof Misskey.ChannelConnection<Channel>>>) {
 		super();
-		// do nothing
+
+		this.channel = args[0];
+		this.name = args[1];
 	}
 
 	public send<T extends keyof Channel['receives']>(type: T, body: Channel['receives'][T]): void {

packages/frontend/src/stream.ts

@@ -13,16 +13,16 @@ import { isEmbedPage } from '@/scripts/embed-page.js';
 // heart beat interval in ms
 const HEART_BEAT_INTERVAL = 1000 * 60;
 
-let stream: Misskey.Stream | null = null;
-let timeoutHeartBeat: ReturnType<typeof setTimeout> | null = null;
+let stream: Misskey.IStream | null = null;
+let timeoutHeartBeat: number | null = null;
 let lastHeartbeatCall = 0;
 
-export function useStream(): Misskey.Stream {
+export function useStream(): Misskey.IStream {
 	if (stream) return stream;
 
 	// TODO: No Websocketモードもここで判定
 	if (isEmbedPage()) {
-		stream = markRaw(new StreamMock(wsOrigin, null) as unknown as Misskey.Stream);
+		stream = markRaw(new StreamMock(wsOrigin, null));
 		return stream;
 	} else {
 		stream = markRaw(new Misskey.Stream(wsOrigin, $i ? {

packages/misskey-js/src/index.ts

@@ -1,6 +1,6 @@
 import { type Endpoints } from './api.types.js';
 import Stream, { Connection } from './streaming.js';
-import { type StreamEvents } from './streaming.js';
+import type { StreamEvents, IStream, IChannelConnection } from './streaming.js';
 import { type Channels } from './streaming.types.js';
 import { type Acct } from './acct.js';
 import * as consts from './consts.js';
@@ -10,6 +10,8 @@ export type {
 	Channels,
 	Acct,
 	StreamEvents,
+	IStream,
+	IChannelConnection,
 };
 
 export {

packages/misskey-js/src/streaming.ts

@@ -22,10 +22,26 @@ export type StreamEvents = {
 	_disconnected_: void;
 } & BroadcastEvents;
 
+export interface IStream extends EventEmitter<StreamEvents> {
+	state: 'initializing' | 'reconnecting' | 'connected';
+
+	useChannel<C extends keyof Channels>(channel: C, params?: Channels[C]['params'], name?: string): IChannelConnection<Channels[C]>;
+	removeSharedConnection(connection: SharedConnection): void;
+	removeSharedConnectionPool(pool: Pool): void;
+	disconnectToChannel(connection: NonSharedConnection): void;
+	send(typeOrPayload: string): void;
+	send(typeOrPayload: string, payload: any): void;
+	send(typeOrPayload: Record<string, any> | any[]): void;
+	send(typeOrPayload: string | Record<string, any> | any[], payload?: any): void;
+	ping(): void;
+	heartbeat(): void;
+	close(): void;
+};
+
 /**
  * Misskey stream connection
  */
-export default class Stream extends EventEmitter<StreamEvents> {
+export default class Stream extends EventEmitter<StreamEvents> implements IStream {
 	private stream: _ReconnectingWebsocket.default;
 	public state: 'initializing' | 'reconnecting' | 'connected' = 'initializing';
 	private sharedConnectionPools: Pool[] = [];
@@ -275,7 +291,18 @@ class Pool {
 	}
 }
 
-export abstract class Connection<Channel extends AnyOf<Channels> = any> extends EventEmitter<Channel['events']> {
+export interface IChannelConnection<Channel extends AnyOf<Channels> = any> extends EventEmitter<Channel['events']> {
+	id: string;
+	name?: string;
+	inCount: number;
+	outCount: number;
+	channel: string;
+
+	send<T extends keyof Channel['receives']>(type: T, body: Channel['receives'][T]): void;
+	dispose(): void;
+}
+
+export abstract class Connection<Channel extends AnyOf<Channels> = any> extends EventEmitter<Channel['events']> implements IChannelConnection<Channel> {
 	public channel: string;
 	protected stream: Stream;
 	public abstract id: string;