chrome/browser/resources/chromeos/accessibility/common/features.ts

// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/** @fileoverview Manages fetching and checking accessibility features. */
import {TestImportManager} from './testing/test_import_manager.js';

import AccessibilityFeature = chrome.accessibilityPrivate.AccessibilityFeature;

export class Features {
  private enabled_: Partial<Record<AccessibilityFeature, boolean>> = {};
  static instance: Features;

  static async init(): Promise<void> {
    if (Features.instance) {
      throw new Error(
          'Cannot create two instances of Features in the same context');
    }
    Features.instance = new Features();
    await Features.instance.fetch_();
  }

  static isEnabled(featureName: AccessibilityFeature): boolean|undefined {
    // Note: Will return undefined for any feature if Features not initialized.
    return Features.instance.enabled_[featureName];
  }

  private async fetch_(): Promise<void[]> {
    const promises: Array<Promise<void>> = [];
    for (const feature of Object.values(AccessibilityFeature)) {
      promises.push(new Promise(resolve => {
        chrome.accessibilityPrivate.isFeatureEnabled(feature, result => {
          this.enabled_[feature] = result;
          resolve();
        });
      }));
    }
    return Promise.all(promises);
  }
}

TestImportManager.exportForTesting(Features);