codicon is an easy to use package that exposes vscode-icons for Flutter.

In the pubspec.yaml file add the codicon dependency as below:

dependencies:
#  codicon: any # uncomment and change for latest version

Import the codicon package where you want to use the icon:

import 'package:codicon/codicon.dart';

Use the icon in an Icon widget:

Icon(
  Codicons.lightBulb,
),