asset_opt #

A CLI tool for analyzing and optimizing Flutter/Dart project assets. Provides detailed analysis, actionable recommendations, and automatic image optimization.

Features #

Analysis #

• Size and type distribution visualization
• Directory structure breakdown
• Image dimension analysis
• Unused asset detection
• Issue detection with recommendations

Optimization #

• Automatic image compression (JPEG, PNG, WebP)
• Format conversion (PNG -> WebP for non-alpha images)
• SVG minification (~70% reduction typical)
• Safe backups before any modification

Cross-Platform #

• Zero-setup native compression via bundled binaries
• Supports macOS (arm64/x64), Linux (x64/arm64), Windows (x64)

Installation #

dart pub global activate asset_opt

Or add to your project's dev dependencies:

dev_dependencies:
    asset_opt: ^1.0.4

Usage #

Command Line #

# Show help
asset_opt --help

# Analyze assets
asset_opt --analyze

# Analyze and optimize
asset_opt --optimize

# Specify project path and quality
asset_opt -p /path/to/project -q 85 --optimize

# Create default config file
asset_opt --init

# Use optimization preset
asset_opt --optimize --preset thumbnails

# Verbose output
asset_opt --verbose

# Disable colors (for CI/redirected output)
asset_opt --no-color

As a Library #

import 'package:asset_opt/asset_opt.dart';

void main() async {
  final fileService = FileService();
  final imageService = ImageService();
  final analysisState = AnalysisState();

  final analyzer = AnalyzeCommand(
    fileService,
    imageService,
    analysisState,
  );

  final analysis = await analyzer.execute('./');

  if (analysis.hasIssues()) {
    for (final asset in analysis.assets) {
      for (final issue in asset.issues) {
        print('${asset.info.name}: ${issue.message}');
      }
    }
  }
}

Output #

Analysis Report #

📊 Asset Analysis Report
────────────────────────
Project: /Users/username/projects/my_app
────────────────────────
└─ assets (632 files, 22.4 MB)
   ├─ images (631 files, 22.4 MB)
   │  ├─ flags (492 files, 3.7 MB)
   │  └─ bgs (4 files, 2.5 MB)
   └─ icons (1 files, 829 B)

Type Distribution #

Type     Size       Files   Distribution
PNG      22.4 MB    631    │████████████████████████████  │ 65.2%
JPEG     10.2 MB    492    │████████████████              │ 29.8%
WEBP      1.5 MB      4    │███                           │  4.3%
SVG     829.0 B       1    │                              │  0.7%

Configuration #

Create asset_opt.yaml in your project root, or run asset_opt --init:

optimization:
    jpeg_quality: 85
    webp_quality: 80
    strip_metadata: true
    convert_png_to_webp: true

limits:
    max_file_size: 1MB
    max_dimensions: 2000

presets:
    thumbnails:
        max_dimensions: 200
        jpeg_quality: 75
    backgrounds:
        max_dimensions: 1920
        jpeg_quality: 90
    icons:
        max_dimensions: 512
        jpeg_quality: 85

exclude:
    - "**/test/assets/*"
    - "**/fixtures/*"

FAQ #

Is it safe to use on production assets?
Yes. The tool creates backups before any optimization.

Should I commit the generated reports?
No. Add asset_opt_reports/ to your .gitignore.

What formats are supported?
PNG, JPEG, WebP, and SVG.

Does it work with CI/CD?
Yes. Use --no-color for cleaner logs.

Contributing #

Contributions welcome. See CONTRIBUTING.md for guidelines.

License #

MIT