third_party/WebKit/Source/devtools/front_end/help/Help.js

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @return {!Help.ReleaseNote}
 */
Help.latestReleaseNote = function() {
  if (!Help._latestReleaseNote) {
    /** @type {!Help.ReleaseNote} */
    Help._latestReleaseNote = Help.releaseNoteText.reduce((acc, note) => note.version > acc.version ? note : acc);
  }
  return Help._latestReleaseNote;
};

/**
 * @return {!Common.Setting}
 */
Help.releaseNoteVersionSetting = function() {
  if (!Help._releaseNoteVersionSetting) {
    /** @type {!Common.Setting} */
    Help._releaseNoteVersionSetting = Common.settings.createSetting('releaseNoteVersionSeen', 0);
  }
  return Help._releaseNoteVersionSetting;
};

Help.showReleaseNoteIfNeeded = function() {
  Help._showReleaseNoteIfNeeded(Help.releaseNoteVersionSetting().get(), Help.latestReleaseNote().version);
};

/**
 * @param {number} lastSeenVersion
 * @param {number} latestVersion
 */
Help._showReleaseNoteIfNeeded = function(lastSeenVersion, latestVersion) {
  if (!lastSeenVersion) {
    Help.releaseNoteVersionSetting().set(latestVersion);
    return;
  }
  if (lastSeenVersion >= latestVersion)
    return;
  Help.releaseNoteVersionSetting().set(latestVersion);
  UI.viewManager.showView(Help._releaseNoteViewId, true);
};

/**
 * @const
 * @type {string}
 */
Help._releaseNoteViewId = 'release-note';

/** @typedef {!{title: string, subtitle: string, link: string}} */
Help.ReleaseNoteHighlight;

/**
 * @typedef {!{version: number, header: string, highlights: !Array<!Help.ReleaseNoteHighlight>,
 *    link: string}}
 */
Help.ReleaseNote;