discourse/app/assets/javascripts/admin/addon/components/dashboard-new-features.js

import Component from "@ember/component";
import { action, computed } from "@ember/object";
import { classNameBindings, classNames } from "@ember-decorators/component";
import { ajax } from "discourse/lib/ajax";

@classNames("section", "dashboard-new-features")
@classNameBindings("hasUnseenFeatures:ordered-first")
export default class DashboardNewFeatures extends Component {
  newFeatures = null;
  releaseNotesLink = null;

  constructor() {
    super(...arguments);

    ajax("/admin/dashboard/new-features.json").then((json) => {
      if (this.isDestroying || this.isDestroyed) {
        return;
      }

      this.setProperties({
        newFeatures: json.new_features,
        hasUnseenFeatures: json.has_unseen_features,
        releaseNotesLink: json.release_notes_link,
      });
    });
  }

  @computed("newFeatures")
  get columnCountClass() {
    return this.newFeatures.length > 2 ? "three-or-more-items" : "";
  }

  @action
  dismissNewFeatures() {
    ajax("/admin/dashboard/mark-new-features-as-seen.json", {
      type: "PUT",
    }).then(() => this.set("hasUnseenFeatures", false));
  }
}