Follow as a clean architecture

src/content/usecases/FollowSlaveUseCase.ts

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+import FollowSlaveRepository, { FollowSlaveRepositoryImpl }
+  from '../repositories/FollowSlaveRepository';
+import FollowPresenter, { FollowPresenterImpl }
+  from '../presenters/FollowPresenter';
+import TabsClient, { TabsClientImpl } from '../client/TabsClient';
+import { LinkHint, InputHint } from '../presenters/Hint';
+import FollowMasterClient, { FollowMasterClientImpl }
+  from '../client/FollowMasterClient';
+import Key from '../domains/Key';
+
+interface Size {
+  width: number;
+  height: number;
+}
+
+interface Point {
+  x: number;
+  y: number;
+}
+
+export default class FollowSlaveUseCase {
+  private presenter: FollowPresenter;
+
+  private tabsClient: TabsClient;
+
+  private followMasterClient: FollowMasterClient;
+
+  private followSlaveRepository: FollowSlaveRepository;
+
+  constructor({
+    presenter = new FollowPresenterImpl(),
+    tabsClient = new TabsClientImpl(),
+    followMasterClient = new FollowMasterClientImpl(window.top),
+    followSlaveRepository = new FollowSlaveRepositoryImpl(),
+  } = {}) {
+    this.presenter = presenter;
+    this.tabsClient = tabsClient;
+    this.followMasterClient = followMasterClient;
+    this.followSlaveRepository = followSlaveRepository;
+  }
+
+  countTargets(viewSize: Size, framePosition: Point): void {
+    let count = this.presenter.getTargetCount(viewSize, framePosition);
+    this.followMasterClient.responseHintCount(count);
+  }
+
+  createHints(viewSize: Size, framePosition: Point, tags: string[]): void {
+    this.followSlaveRepository.enableFollowMode();
+    this.presenter.createHints(viewSize, framePosition, tags);
+  }
+
+  showHints(prefix: string) {
+    this.presenter.filterHints(prefix);
+  }
+
+  sendKey(key: Key): void {
+    this.followMasterClient.sendKey(key);
+  }
+
+  isFollowMode(): boolean {
+    return this.followSlaveRepository.isFollowMode();
+  }
+
+  async activate(tag: string, newTab: boolean, background: boolean) {
+    let hint = this.presenter.getHint(tag);
+    if (!hint) {
+      return;
+    }
+
+    if (hint instanceof LinkHint) {
+      let url = hint.getLink();
+      // ignore taget='_blank'
+      if (!newTab && hint.getLinkTarget() === '_blank') {
+        hint.click();
+        return;
+      }
+      // eslint-disable-next-line no-script-url
+      if (!url || url === '#' || url.toLowerCase().startsWith('javascript:')) {
+        return;
+      }
+      await this.tabsClient.openUrl(url, newTab, background);
+    } else if (hint instanceof InputHint) {
+      hint.activate();
+    }
+  }
+
+  clear(): void {
+    this.followSlaveRepository.disableFollowMode();
+    this.presenter.clearHints();
+  }
+}