🛸 Taso

The industry-standard for Environment Variable Drift Detection.

Find what's silently wrong with your environment — before production does. Taso bridges the gap between your source code and your configuration.

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⚡ Why Taso?

Most tools only compare .env files to other .env files. Taso is different.

Taso analyzes your actual source code using AST (Abstract Syntax Tree) and optimized scanning to find every environment variable your app actually tries to access. It then cross-checks these against your configuration.

If you call os.Getenv("STRIPE_SECRET") in your code, but forgot to add it to your .env or production secrets, Taso catches it instantly.

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🚀 Key Features

• AST-Based Accuracy: True code analysis for Go, JavaScript, and TypeScript (no more regex false positives).
• High-Performance Caching: Uses SHA-256 file hashing to skip unchanged files. 10,000 files scanned in milliseconds.
• Language Polyglot: First-class support for 9 languages (Go, JS, TS, Python, Rust, Ruby, Java, C#, PHP, Kotlin).
• Zero Config: Works out of the box with standard .env patterns.
• Safety First: Built-in protection against path traversal and resource exhaustion.

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📦 Installation

macOS & Linux (Homebrew)

brew tap Hossiy21/homebrew-tap
brew install taso

Windows (Scoop)

scoop bucket add Hossiy21 https://github.com/Hossiy21/scoop-bucket
scoop install taso

Via Go

go install github.com/Hossiy21/taso@latest

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🛡️ Security

Taso is built with security in mind:

• ✅ No sensitive data stored — Only analyzes source code, never captures environment variable values
• ✅ Protected against attacks — Path traversal, resource exhaustion, symlink attacks blocked
• ✅ Safe caching — SHA-256 hashing, no secrets in cache
• ✅ Audit logging — Track all scans and issues

For detailed security information, see our Security Policy.

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🛠️ Commands

taso ghost — Find "Ghost" Variables

Scans source code to find variables accessed in code but missing from .env.

$ taso ghost

👻  2 ghost variable(s) found

  STRIPE_WEBHOOK_SECRET
    used in:     api/webhooks.go:47
    not in:      .env, .env.local

  DATABASE_REPLICA_URL
    used in:     db/pool.go:12
    not in:      .env

Flag	Description
--fix	Interactively add missing variables to your .env
--json	Export findings for CI/CD pipelines
--dir <path>	Specify a custom directory to scan

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taso score — Health Audit

Gives your project an environment health score (0–100) based on ghost variables, placeholder values, and security posture.

$ taso score

  Env Health Score
  [====================----------]  B  72/100

  ⚠  1 ghost variable(s) found — run 'taso ghost' to see them
  ⚠  3 empty or placeholder value(s) in your env files

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taso snap + taso drift — Drift Tracking

Track how your environment evolves over time.

taso snap     # Save a baseline of your current keys
taso drift    # See what keys were added, removed, or changed since the snapshot

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🌍 Supported Languages

Language	Analysis Method	Patterns Detected
Go	AST	os.Getenv, os.LookupEnv
JS / TS	AST	process.env, import.meta.env, Destructuring
Python	Regex+	os.environ, os.getenv, environ.get
Rust	Regex+	env::var, env!, option_env!
Ruby	Regex+	ENV["KEY"], ENV.fetch
Java	Regex+	System.getenv
C#	Regex+	Environment.GetEnvironmentVariable
PHP	Regex+	getenv, $_ENV, $_SERVER
Kotlin	Regex+	System.getenv

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⚙️ Configuration

Taso works with no config, but you can customize it with a .taso.yaml:

ignored_dirs:
  - vendor
  - node_modules
  - .git
  - dist
  - custom_build

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🛡️ CI/CD Integration

Taso is built for automation. Use the --json flag in your GitHub Actions or GitLab CI to fail builds if the environment score drops too low.

# Example CI Check
taso ghost --json | jq '.ghost_count == 0'

GitHub Actions Example

name: Environment Drift Check

on: [pull_request, push]

jobs:
  taso-check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-go@v4
        with:
          go-version: '1.23'
      - run: go install github.com/Hossiy21/taso@latest
      - run: taso score
      - run: taso ghost --json

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💡 Usage Examples

Real-World Scenario 1: Microservices Architecture

Problem: Your team has 5 microservices, each with their own environment variables. A new developer forgets to set KAFKA_BROKER_URL in the payment service.

$ cd payment-service
$ taso ghost

👻  1 ghost variable(s) found

  KAFKA_BROKER_URL
    used in:     events/producer.go:34
    not in:      .env, .env.production

Solution: Run before deploying to catch missing variables instantly.

$ taso ghost --fix
? Add KAFKA_BROKER_URL to .env? (Y/n) y
✓ Added KAFKA_BROKER_URL to .env

Real-World Scenario 2: Onboarding New Team Members

Problem: A new developer clones the repo and runs the app, but gets cryptic errors because they don't know which environment variables are required.

$ taso score

  Env Health Score
  [==============----]  C  65/100

  ⚠  3 ghost variable(s) found — run 'taso ghost' to see them
  ⚠  5 empty or placeholder value(s) in your env files

$ taso ghost
# Shows exactly what's missing — no guesswork!

Real-World Scenario 3: Tracking Environment Drift Over Time

Problem: Your production environment has been stable for months, but something changed. Did someone add a secret? Remove a config?

# When you deploy, save a snapshot
$ taso snap
✓ Snapshot saved to .taso.snap

# Later, check for drift
$ taso drift

  Environment Drift Report
  
  Added Keys:
    - NEW_FEATURE_FLAG
    - ANALYTICS_TOKEN

  Removed Keys:
    - LEGACY_SERVICE_URL

Real-World Scenario 4: Pre-commit Hook

Prevent environment variable issues before they reach CI/CD:

#!/bin/bash
# .git/hooks/pre-commit
taso ghost
if [ $? -ne 0 ]; then
  echo "❌ Ghost variables detected! Fix them before committing."
  exit 1
fi

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🤝 Contributing

We welcome contributions from the community! Whether it's bug fixes, new language support, or documentation improvements, your help makes Taso better.

How to Contribute

1. Fork the repository and create a feature branch:

   git clone https://github.com/Hossiy21/taso.git
   cd taso
   git checkout -b feature/your-feature-name

2. Set up your development environment:

   go mod download
   go test ./...

3. Make your changes and write tests:

   go test ./...  # Ensure all tests pass
   go fmt ./...   # Format your code

4. Commit and push your changes:

   git commit -m "feat: add support for new language"
   git push origin feature/your-feature-name

5. Open a Pull Request with a clear description of your changes.

Development Guidelines

• Code Style: Follow Go's standard conventions. Use gofmt and golint.
• Testing: All new features must include unit and integration tests.
• Documentation: Update the README and code comments as needed.
• Performance: Avoid changes that negatively impact scanning speed.

Areas We're Looking For Help

• New Language Support: Add AST-based or regex patterns for languages not yet supported.
• Performance Optimizations: Help us scan even faster.
• Documentation: Improve guides, examples, and tutorials.
• Bug Fixes: Report issues and submit fixes.
• Integrations: Add plugins for popular tools and frameworks.

Getting Help

• Questions? Open a GitHub Discussion
• Found a bug? Report it here

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🗺️ Roadmap

Phase 1: Foundation (Current)

• ✅ AST-based scanning for Go, JS/TS
• ✅ Environment health scoring
• ✅ Drift tracking
• ✅ High-performance caching
• ✅ Security hardening

Phase 2: Expansion (Q3 2026)

• 🔄 Enhanced language support (prioritize Python, Rust, Java)
• 🔄 Web dashboard for visualization
• 🔄 Team collaboration features (shared snapshots, audit logs)
• 🔄 VS Code extension for real-time linting

Phase 3: Intelligence (Q4 2026)

• 📋 ML-powered anomaly detection for environment variables
• 📋 Automated secret rotation recommendations
• 📋 Integration with HashiCorp Vault and AWS Secrets Manager
• 📋 Advanced CI/CD templates for all major platforms

Phase 4: Enterprise (Q1 2027)

• 📋 Multi-repository scanning
• 📋 Advanced RBAC and audit logging
• 📋 On-premises deployment options
• 📋 SLA and premium support

Community-Driven Features

Have a feature request? Vote on and suggest ideas in GitHub Discussions.

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📄 License

MIT — Created by Hossiy21