How to use Reflectable package in Dart

Question

I am trying to run this package using Dart not fllutter by fallowing the next steps:

1. Creating the main file as is given here
2. creating a build.yaml:

targets:
  $default:
    builders:
      reflectable:
        generate_for:
          - main.dart
        options:
          formatted: true

3. updating the version in pubspec.yaml:

name: advertisement_app
description: A sample command-line application.
version: 1.0.0

environment:
  sdk: '>=2.18.0 <3.0.0'

dependencies:
  parse_server_sdk: ^4.0.2
  dartz: ^0.10.1
  reflectable: 4.0.5

dev_dependencies:
  lints: 2.0.1
  test: 1.24.1
  build_runner: 2.3.3
  built_value_generator: 8.4.4

4. Run the command: dart run build_runner build

And I have the fallowing output:

[INFO] Generating build script completed, took 527ms
[INFO] Reading cached asset graph completed, took 83ms
[INFO] Checking for updates since last build completed, took 567ms
[INFO] Running build completed, took 7ms
[INFO] Caching finalized dependency graph completed, took 34ms
[INFO] Succeeded after 53ms with 0 outputs (0 actions)

Dose anyone know what exactly I am doing wrong and why is not building any files?

My structure:

.
├── build.yaml
├── main.dart
├── pubspec.lock
├── pubspec.yaml
└── TEST_REFLECTION.iml

0 directories, 5 files