feat: initial release v0.1.0 — Homebrew recipe toolkit — mash, IBU, water chemistry, style guidelines

Author: AdametherzLab

.gitignore

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+node_modules/
+dist/
+.env
+.env.local
+*.log
+.DS_Store
+Thumbs.db
+coverage/
+.turbo/
+*.tsbuildinfo

CONTRIBUTING.md

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+# Contributing to brewkit
+
+Thanks for your interest in contributing!
+
+## Development Setup
+
+```bash
+git clone https://github.com/AdametherzLab/brewkit.git
+cd brewkit
+bun install
+bun test
+```
+
+## Pull Requests
+
+1. Fork the repo and create your branch from `main`
+2. Add tests for any new functionality
+3. Ensure all tests pass: `bun test`
+4. Ensure types check: `bun run typecheck`
+5. Submit your PR
+
+## Reporting Issues
+
+Use [GitHub Issues](https://github.com/AdametherzLab/brewkit/issues) to report bugs or request features.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the MIT License.

LICENSE

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+MIT License
+
+Copyright (c) 2026 AdametherzLab
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# brewkit 🍻
+
+[![CI](https://github.com/AdametherzLab/brewkit/actions/workflows/ci.yml/badge.svg)](https://github.com/AdametherzLab/brewkit/actions) [![TypeScript](https://img.shields.io/badge/TypeScript-strict-blue)](https://www.typescriptlang.org/) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)
+
+**Homebrew's secret sauce** - Precision brewing calculations for grain, hops, and water chemistry. Never guess your strike temps or IBUs again!
+
+## 🔥 Features
+- ✅ Mash calculations: Strike water temps, infusion volumes, efficiency
+- 🌡️ IBU formulas: Tinseth vs Rager methods with hop contribution breakdown
+- 🧪 Water chemistry: Mineral adjustments and profile balancing
+- ⚖️ Unit-aware: Metric/imperial conversions built-in
+- 🛠️ Fully typed API with production-grade error handling
+
+## 📦 Installation
+```bash
+npm install @adametherzlab/brewkit
+# or
+bun add @adametherzlab/brewkit
+```
+
+## 🚀 Quick Start
+```typescript
+// REMOVED external import: import { strikeWaterTemp, calculateIBU, adjustWater } from '@adametherzlab/brewkit';
+// REMOVED external import: import type { MashConfig, HopAddition } from '@adametherzlab/brewkit';
+
+// Calculate strike water temperature
+const mashConfig: MashConfig = {
+  grainWeight: 5.4,
+  waterRatio: 2.8,
+  targetTemp: 67,
+  grainTemp: 18
+};
+console.log(`Heat water to ${strikeWaterTemp(mashConfig)}°C`); // → 72.3°C
+
+// Determine IBUs for recipe
+const hops: HopAddition[] = [
+  { name: 'Amarillo', alphaAcid: 8.5, weight: 50, boilTime: 60 },
+  { name: 'Mosaic', alphaAcid: 12.2, weight: 30, boilTime: 15 }
+];
+const ibuResult = calculateIBU(hops, 1.055, 5.5, 'TINSETH');
+console.log(`Total IBU: ${ibuResult.totalIBU.toFixed(1)}`); // → 45.6 IBU
+```
+
+## 📚 API Reference
+
+### Mash Calculations
+**`strikeWaterTemp(config: MashConfig): number`**  
+*Params:* `grainWeight`(kg), `waterRatio`(L/kg), `targetTemp`(°C), `grainTemp`(°C)  
+*Returns:* Strike temperature in °C  
+```typescript
+strikeWaterTemp({ grainWeight: 4.5, waterRatio: 3, targetTemp: 65, grainTemp: 22 }); // → 70.1
+```
+
+**`infusionVolume(currentVolume: number, grainWeight: number, currentTemp: number, targetTemp: number): number`**  
+*Params:* Current volume (L), grain weight (kg), current/target temps (°C)  
+*Returns:* Liters of boiling water needed  
+```typescript
+infusionVolume(15, 5, 63, 68); // → 4.87 L
+```
+
+### Bitterness Calculations
+**`calculateIBU(additions: HopAddition[], og: number, volumeGallons: number, method: IBUMethod): IBUResult`**  
+*Params:* Hop additions array, original gravity (1.XXX), batch volume (gal)  
+*Returns:* Object with total IBU and per-hop breakdown  
+```typescript
+calculateIBU([{alphaAcid: 6, weight: 30, boilTime: 60}], 1.050, 5, 'RAGER');
+```
+
+### Water Chemistry
+**`adjustWater(source: WaterProfile, target: WaterProfile, volumeLiters: number): MineralAddition[]`**  
+*Throws if:* Target requires ion reduction (use RO water instead)  
+```typescript
+adjustWater(
+  {Ca: 50, Mg: 10, SO4: 80, Cl: 40}, 
+  {Ca: 150, Mg: 20, SO4: 300, Cl: 50},
+  25
+);
+// → [{mineral: 'CaSO4', grams: 12.4, volume: 25}]
+```
+
+## 🧪 Advanced Usage: Full Recipe Setup
+```typescript
+// TypeScript example
+import { 
+  strikeWaterTemp, 
+  calculateIBU,
+  adjustWater,
+  BrewTypes,
+  type MashConfig,
+  type HopAddition
+} from '@adametherzlab/brewkit';
+
+// Configure mash for American IPA
+const mashSetup: MashConfig = {
+  grainWeight: 6.8,
+  waterRatio: 2.6,
+  targetTemp: 66,
+  grainTemp: 20.5
+};
+const strike = strikeWaterTemp(mashSetup);
+
+// Calculate hop schedule
+const hopAdditions: HopAddition[] = [
+  { name: 'Centennial', alphaAcid: 10, weight: 60, boilTime: 60 },
+  { name: 'Simcoe', alphaAcid: 13.5, weight: 40, boilTime: 10 }
+];
+const ibu = calculateIBU(hopAdditions, 1.065, 6, BrewTypes.IBUMethod.TINSETH);
+
+// Adjust water profile for crisp bitterness
+const additions = adjustWater(
+  { Ca: 75, Mg: 8, SO4: 120, Cl: 50 },
+  { Ca: 150, Mg: 15, SO4: 300, Cl: 75 },
+  25
+);
+```
+
+## 🧠 Knowledge Base
+
+### IBU Methods Showdown
+- **Tinseth**  
+  Formula: `IBU = (AA% * Util * Weight(g) * 7489) / (Vol(gal) * (1 + GA))`  
+  *GA = (OG - 1.050)/0.2*
+
+- **Rager**  
+  Formula: `IBU = (Weight(oz) * AA% * Util * 7489) / Vol(gal)`  
+
+### Water Chemistry Primer
+| Beer Style      | Ca (ppm) | SO4 (ppm) | Cl (ppm) | SO4/Cl Ratio  
+|-----------------|----------|-----------|----------|-------------
+| Czech Pilsner   | 50-70    | 30-50     | 20-30    | 1.5:1  
+| West Coast IPA  | 100-150  | 200-400   | 50-100   | 3:1  
+| NEIPA           | 100-150  | 50-100    | 150-200  | 1:2  
+| Dry Stout       | 50-100   | 50-100    | 50-100   | 1:1  
+
+## 🚨 Troubleshooting
+**Units Gotchas**  
+- All grain weights in **kilograms**  
+- Water volumes in **liters** unless specified (IBU uses gallons)  
+- Alpha acids as **percentage** (6.5% = 6.5, not 0.065)  
+- Temperature always in **Celsius**
+
+**Common Errors**  
+- `RangeError: Target temp exceeds boiling` → Check unit conversion (F vs C)  
+- `Invalid mineral: NaCl` → Use standardized mineral names (CaSO4, MgCl2)  
+- `Negative delta for Ca` → Start with softer water if reducing minerals
+
+## 🤝 Contributing  
+See [CONTRIBUTING.md](CONTRIBUTING.md) for development setup and guidelines.
+
+## 📜 License  
+MIT © [AdametherzLab](https://github.com/AdametherzLab)

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in this project, please report it responsibly.
+
+**Contact:** security@adametherzlab.com
+
+**Process:**
+1. Email the details of the vulnerability
+2. Include steps to reproduce if possible
+3. We will acknowledge your report within 48 hours
+4. We aim to fix critical issues within 7 days
+
+## Supported Versions
+
+| Version | Supported |
+| ------- | --------- |
+| 0.x.x   | Yes       |
+
+## Disclosure Policy
+
+- We follow responsible disclosure practices
+- Please do not publicly disclose vulnerabilities before they are fixed
+- We will credit reporters in our release notes (unless you prefer anonymity)

package.json

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+{
+  "name": "@adametherzlab/brewkit",
+  "version": "0.1.0",
+  "description": "Homebrew recipe toolkit — mash, IBU, water chemistry, style guidelines",
+  "type": "module",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js",
+      "default": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "dist",
+    "README.md",
+    "LICENSE"
+  ],
+  "scripts": {
+    "dev": "bun run src/index.ts",
+    "test": "bun test",
+    "build": "tsc --build",
+    "prepublishOnly": "bun run build",
+    "typecheck": "tsc --noEmit"
+  },
+  "devDependencies": {
+    "bun-types": "latest",
+    "typescript": "^5.5.0"
+  },
+  "keywords": [
+    "typescript",
+    "bun",
+    "nodejs",
+    "homebrew",
+    "beer",
+    "brewing",
+    "recipe",
+    "water-chemistry"
+  ],
+  "author": {
+    "name": "AdametherzLab",
+    "url": "https://github.com/AdametherzLab"
+  },
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/AdametherzLab/brewkit.git"
+  },
+  "homepage": "https://github.com/AdametherzLab/brewkit#readme",
+  "bugs": {
+    "url": "https://github.com/AdametherzLab/brewkit/issues"
+  },
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/AdametherzLab"
+  },
+  "engines": {
+    "node": ">=20.0.0"
+  },
+  "sideEffects": false
+}

src/hops.ts

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+import type { HopAddition, IBUMethod, IBUResult } from './types.js';
+
+function getTinsethUtilization(boilTime: number, og: number): number {
+  const utilization = (1 - Math.exp(-0.04 * boilTime)) / 4.15;
+  const bignessFactor = 1.65 * (0.000125 ** (og - 1));
+  return utilization * bignessFactor;
+}
+
+function getRagerUtilization(boilTime: number, og: number): number {
+  let utilization = (18.11 + (13.86 * Math.tanh((boilTime - 31.32) / 18.27))) / 100;
+  if (og > 1.050) {
+    utilization *= 1 + ((og - 1.050) / 0.2);
+  }
+  return utilization;
+}
+
+/**
+ * Calculates beer bitterness using specified IBU method.
+ * @param additions - Hop additions with grams weight and boil minutes
+ * @param og - Original gravity (e.g., 1.050)
+ * @param volumeGallons - Batch volume in US gallons
+ * @param method - TINSETH or RAGER calculation method
+ * @returns Total IBU and per-hop contributions
+ * @throws {RangeError} For invalid gravity, volume, or hop parameters
+ * @example
+ * const result = calculateIBU(
+ *   [{name: 'Cascade', alphaAcid: 5.5, weight: 28, boilTime: 60}],
+ *   1.055,
+ *   5,
+ *   IBUMethod.Tinseth
+ * );
+ */
+export function calculateIBU(
+  additions: HopAddition[],
+  og: number,
+  volumeGallons: number,
+  method: IBUMethod
+): IBUResult {
+  if (og <= 0 || Number.isNaN(og)) throw new RangeError('Invalid original gravity');
+  if (volumeGallons <= 0 || Number.isNaN(volumeGallons)) {
+    throw new RangeError('Invalid batch volume');
+  }
+
+  additions.forEach((addition, index) => {
+    if (addition.alphaAcid < 0 || addition.alphaAcid > 100) {
+      throw new RangeError(`Hop ${index} alpha acid must be 0-100%`);
+    }
+    if (addition.weight < 0) throw new RangeError(`Hop ${index} has negative weight`);
+    if (addition.boilTime < 0) throw new RangeError(`Hop ${index} has negative boil time`);
+  });
+
+  const contributions = additions.map((addition) => {
+    const ounces = addition.weight / 28.3495; // Convert grams to ounces
+    const utilization = method === IBUMethod.Tinseth
+      ? getTinsethUtilization(addition.boilTime, og)
+      : getRagerUtilization(addition.boilTime, og);
+
+    const contribution = (ounces * addition.alphaAcid * utilization * 7489) / volumeGallons;
+    return { hopName: addition.name, contribution };
+  });
+
+  const totalIBU = contributions.reduce((sum, curr) => sum + curr.contribution, 0);
+  
+  return { totalIBU, additions: contributions };
+}

src/index.ts

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+import type {
+  MashConfig,
+  MashResult,
+  HopAddition,
+  IBUResult,
+  WaterProfile,
+  MineralAddition,
+  WaterAdjustmentResult,
+} from './types';
+export type { MashConfig, MashResult, HopAddition, IBUResult, WaterProfile, MineralAddition, WaterAdjustmentResult };
+
+export { IBUMethod, BrewTypes } from './types';
+
+export { strikeWaterTemp, mashEfficiency, infusionVolume } from './mash';
+export { calculateIBU, tinsethUtilization, ragerUtilization } from './hops';
+export { adjustWater, applyMinerals, mineralContributions } from './water';