devstar_plugin/src/views/quick-access-tree.js

import * as vscode from 'vscode';

class QuickItem extends vscode.TreeItem {
  constructor(label, command, args, collapsibleState, children) {
    super(label, collapsibleState);
    if (command) {
      this.command = {
        title: label,
        command,
        arguments: args,
      };
    }
    this.customChildren = children;
  }
}

export default class QuickAccessTreeProvider {
  getChildren(element) {
    if (element && element.customChildren) {
      return element.customChildren;
    }

    return [
      new QuickItem(
        'SuperIDE Home',
        undefined,
        undefined,
        vscode.TreeItemCollapsibleState.Expanded,
        [new QuickItem('Open', 'superide.showHome')]
      ),
      new QuickItem(
        'Miscellaneous',
        undefined,
        undefined,
        vscode.TreeItemCollapsibleState.Expanded,
        [new QuickItem('Connect Remote Container', 'superide.connectRemoteContainer')]
      ),
    ];
  }

  getTreeItem(element) {
    return element;
  }
}