zakatrs 1.0.1

A type-safe, comprehensive, and Fiqh-compliant Zakat calculation library.

بِسْمِ اللهِ الرَّحْمٰنِ الرَّحِيْمِ

السلام عليكم

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       P U R I F Y  Y O U R  W E A L T H 

"Take from their wealth a charity by which you purify them and cause them increase..."
— Surah At-Tawbah 9:103

Zakat

Rust library for Islamic Zakat calculation. Uses rust_decimal for precision.

Features

• Gold, Silver, Business, Agriculture, Livestock, Mining & Rikaz

• Stocks, Mutual Funds, Crypto (as liquid assets)

• Professional Income (Gross/Net)

• Zakat Fitrah

• Configurable Nisab thresholds

• Portfolio aggregation (Dam' al-Amwal)

• Dynamic Portfolio (Add, Remove, Replace assets with stable UUIDs)

• Asset Labeling (e.g., "Main Store", "Crypto Wallet")

• Input Sanitization & Validation (Rejects negative values, ensures safe configuration)

• Arabic Numeral Support (Eastern Arabic ٠-٩, Perso-Arabic ۰-۹)

• Flexible Configuration (Env Vars, JSON, Fluent API, Partial Loading)

• Fiqh Compliance (Jewelry exemptions, Madhab-specific rules, Hawl requirements)

• Hawl (Lunar Year) Tracking (Precise date-based eligibility)

• Stock Purification (Tathir) (Deduct impure income before calculation)

• Async Support (Optional integration with tokio and async-trait)

• Live Pricing Interface (e.g. for API integration)

• Detailed Reporting (Livestock in-kind details, calculation traces, metadata support)

• explain() Debugging (Get human-readable trace of calculations)

• to_explanation() Structured API (Get structured data for frontend rendering)

• with_locale() Input Parsing (Explicit EU/US/Arabic locale handling)

• Custom Strategies (Pluggable ZakatStrategy trait for custom rules)

• Full Serialization (Save/Load Portfolios via serde & JSON)

Internationalization (i18n)

zakat now fully supports internationalization for calculation summaries and explanations.

Supported Locales

• English (US): ZakatLocale::EnUS (Default)
• Indonesian: ZakatLocale::IdID
• Arabic (Saudi): ZakatLocale::ArSA

Use Cases & Documentation

We support multiple platforms. Please refer to the specific documentation for your needs:

• 🦀 Rust Usage Guide: Full API documentation for Rust developers.
• 🐍 Python Usage Guide: Using zakatrs bindings.
• 📦 JavaScript / Node.js Usage: Using @islamic/zakat WASM package.
• 💙 Flutter / Dart Usage: Using the zakat package.

Installation

Rust

With Async Support (Default):

[dependencies]
zakat = "1.0.1"
rust_decimal = "1.39"
tokio = { version = "1", features = ["full"] }

Synchronous Only:

[dependencies]
zakat = { version = "1.0.1", default-features = false }
rust_decimal = "1.39"

Python

pip install zakatrs

Node.js / Web

NPM:

npm install @islamic/zakat

JSR:

npx jsr add @islam/zakat

Flutter (Dart)

dart pub add zakat

Build & Development

This project uses xtask — a Rust-based task runner that works cross-platform without needing external shell scripts.

Prerequisites

• Rust: Install via rustup
• wasm-pack: cargo install wasm-pack
• typeshare (optional): cargo install typeshare-cli for type generation
• flutter_rust_bridge (for Dart): See flutter_rust_bridge docs

Available Commands

# Build everything (Rust core, WASM, Dart, and generate types)
cargo xtask build-all

# Sync version numbers across all manifests (Cargo.toml → package.json, pubspec.yaml, jsr.json)
cargo xtask sync-versions

# Publish to all registries (Crates.io, NPM, JSR, PyPI, Pub.dev)
cargo xtask publish-all

# Publish to individual platforms
cargo xtask publish-crates   # Crates.io only
cargo xtask publish-pypi     # PyPI only
cargo xtask publish-npm      # NPM only
cargo xtask publish-jsr      # JSR only
cargo xtask publish-dart     # Pub.dev only

# Dry run (validate without publishing)
cargo xtask publish-dart --dry-run
cargo xtask publish-all --dry-run

What build-all Does

1. Rust Core: Compiles the main library with cargo build --release
2. WASM Package: Uses wasm-pack build to generate the NPM package in pkg/
3. Type Generation: Uses typeshare to generate TypeScript (pkg/types.ts) and Kotlin (zakat_android/.../Types.kt) type definitions
4. Dart Bindings: Runs flutter_rust_bridge_codegen for Flutter bindings in zakat_dart/

Manual Builds

# Build Rust core only
cargo build --release

# Build WASM only
wasm-pack build --target web --out-dir pkg

# Generate types only (requires typeshare-cli)
typeshare ./zakat-core --lang=typescript --output-file=./pkg/types.ts
typeshare ./zakat-core --lang=kotlin --output-file=./zakat_android/lib/src/main/java/com/islamic/zakat/Types.kt

# Build Dart bindings only
cd zakat_dart && flutter_rust_bridge_codegen generate

Running Tests

# Run all tests
cargo test

# Run tests without async features
cargo test --no-default-features

# Run specific test file
cargo test --test portfolio_aggregation

Modules

Module	Nisab
maal::precious_metals	85g Gold / 595g Silver
maal::business	85g Gold
maal::income	85g Gold
maal::investments	85g Gold
maal::agriculture	653 kg
maal::livestock	Count-based
maal::mining	Rikaz: None / Mines: 85g Gold
fitrah	N/A

Contributing

1. Add tests
2. Use rust_decimal
3. If adding async features, ensure they are gated behind #[cfg(feature = "async")]
4. Run cargo test and cargo check --no-default-features

Support

License

MIT

Fiqh References & Compliance

We built this library with a deep respect for Islamic Jurisprudence (Fiqh), ensuring that every calculation isn't just mathematically correct, but religiously valid. Here is the breakdown of the scholarly sources (Dalil) and methodlologies we rely on.

1. Precious Metals (Gold & Silver)

For gold and silver, we adhere to the standard Nisab thresholds established in the Sunnah: 85 grams for Gold (20 Dinars) and 595 grams for Silver (200 Dirhams). This is based on the Hadith of Ali (ra) in Sunan Abu Dawud 1573 and Sahih Muslim 979.

What about Jewelry? This is a classic area of valid difference (Ikhtilaf). By default, we follow the Hanafi view (as found in Al-Hidayah) which regards personal jewelry as Zakatable wealth, citing the Hadith of the bracelets of fire (Sunan Abu Dawud 1558). However, we fully support the majority opinion (Shafi'i, Maliki, Hanbali) which treats permissible personal jewelry as exempt. You can easily toggle this in your configuration to match your Madhab.

2. Business Assets (Urud al-Tijarah)

All trade goods are valued at their current market price, not the cost price. This comes from the Prophet's (ﷺ) command to Samurah bin Jundub to pay Zakat on what is "prepared for sale" (Sunan Abu Dawud 1562).

Regarding debts: We deduct Immediate Liabilities (Dayn al-Hal) before calculation. This prevents you from paying Zakat on money that essentially belongs to your creditors, a principle supported by classical texts like Al-Mughni and modern standards like AAOIFI No. 35.

3. Agriculture (Zuru' wal-Thimar)

We handle the varying rates for crops based on how much effort goes into watering them:

• 10% (Ushr) for crops watered naturally by rain (Sahih Bukhari 1483).
• 5% (Half-Ushr) for strictly irrigated crops requiring cost and labor (Sahih Muslim 981).

For the Nisab (5 Awsuq), we use the standard conversion of approximately 653 kg (derived from Sahih Muslim 979), following the research of Dr. Yusuf Al-Qaradawi in his monumental work, Fiqh al-Zakah.

4. Livestock (An'am)

Our camel Zakat calculator is meticulously coded to follow the exact age tiers (like Bint Makhad, Bint Labun) outlined in the famous Letter of Abu Bakr (ra) preserved in Sahih Bukhari 1454.

Crucially, we enforce the Saimah condition: Zakat is only due if your livestock grazes freely on open pastures for the majority of the year. Feed-lot animals are generally exempt from this specific category.

5. Modern Assets & Portfolio

• Stocks & Crypto: We treat these as Trade Goods (Urud), subjecting them to a 2.5% rate on their market value, consistent with AAOIFI Standard 35. We also support Purification (Tathir), allowing you to automatically deduct percentages of non-halal income (e.g., from interest) before the Zakat calculation.
• Professional Income: We support Dr. Al-Qaradawi's view on Zakat al-Mustafad, allowing you to calculate Zakat either on your Gross income (like a harvest) or Net income (after basic needs).
• The "Dam' al-Amwal" Principle: To ensure the computation is most beneficial for the poor (Anfa' lil-fuqara), we follow the Hanafi methodology of aggregating all your monetary assets (Gold, Silver, Cash, Stocks) into a single pot to check against the Nisab, rather than isolating them.