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

// Copyright 2023 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 command line flags. */
import {TestImportManager} from './testing/test_import_manager.js';

export enum FlagName {
  CHROMEVOX_Q1_FAST_TRACK = 'enable-chromevox-q1-fast-track-features',
  MAGNIFIER_DEBUG_DRAW_RECT = 'enable-magnifier-debug-draw-rect',
  MANIFEST_V3 = 'enable-experimental-accessibility-manifest-v3',
  SWITCH_ACCESS_TEXT = 'enable-experimental-accessibility-switch-access-text',
}

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

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

  static isEnabled(flagName: FlagName): boolean|undefined {
    // Note: Will return undefined for any flag if Flags not initialized.
    return Flags.instance.enabled_[flagName];
  }

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

TestImportManager.exportForTesting(Flags);