enhance(frontend): Websocketを使用しないモードを実装

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

@@ -0,0 +1,75 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { EventEmitter } from 'eventemitter3';
+import * as Misskey from 'misskey-js';
+import type { Channels, StreamEvents } 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;
+
+/**
+ * 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> {
+	public readonly state = 'initializing';
+
+	constructor(...args: ConstructorParameters<typeof Misskey.Stream>) {
+		super();
+		// do nothing
+	}
+
+	public useChannel<C extends keyof Channels>(channel: C, params?: Channels[C]['params'], name?: string): ChannelConnectionMock<Channels[C]> {
+		return new ChannelConnectionMock(this, channel, name);
+	}
+
+	public removeSharedConnection(connection: any): void {
+		// do nothing
+	}
+
+	public removeSharedConnectionPool(pool: any): void {
+		// do nothing
+	}
+
+	public disconnectToChannel(): void {
+		// do nothing
+	}
+
+	public send(typeOrPayload: string): void
+	public send(typeOrPayload: string, payload: any): void
+	public send(typeOrPayload: Record<string, any> | any[]): void
+	public send(typeOrPayload: string | Record<string, any> | any[], payload?: any): void {
+		// do nothing
+	}
+
+	public ping(): void {
+		// do nothing
+	}
+
+	public heartbeat(): void {
+		// do nothing
+	}
+
+	public close(): void {
+		// do nothing
+	}
+}
+
+class ChannelConnectionMock<Channel extends AnyOf<Channels> = any> extends EventEmitter<Channel['events']>{
+	public id = '';
+
+	constructor(stream: StreamMock, ...args: OmitFirst<ConstructorParameters<typeof Misskey.ChannelConnection<Channel>>>) {
+		super();
+		// do nothing
+	}
+
+	public send<T extends keyof Channel['receives']>(type: T, body: Channel['receives'][T]): void {
+		// do nothing
+	}
+
+	public dispose(): void {
+		// do nothing
+	}
+}