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Merge pull request #252 from objectstack-ai/copilot/discuss-splitting-plugins
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‎MIGRATION_GUIDE.md‎

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# Migration Guide: Formula and Validator Plugin Refactoring
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## Overview
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Starting from version 4.0.2, the formula engine and validator have been split from `@objectql/core` into separate plugin packages:
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- `@objectql/plugin-formula` - Formula engine functionality
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- `@objectql/plugin-validator` - Validation engine functionality
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This change improves modularity and allows applications to include only the features they need.
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## What Changed
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### Package Structure
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**Before (v4.0.1 and earlier):**
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```
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@objectql/core
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├── FormulaEngine
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├── FormulaPlugin
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├── Validator
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└── ValidatorPlugin
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```
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**After (v4.0.2+):**
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```
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@objectql/plugin-formula
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├── FormulaEngine
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└── FormulaPlugin
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@objectql/plugin-validator
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├── Validator
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└── ValidatorPlugin
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@objectql/core
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└── [core repository and query logic only]
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```
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### Breaking Changes
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**Important:** The `@objectql/core` package no longer re-exports formula and validator components. You must update your imports to use the new packages directly.
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## Migration Path
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### Required Changes
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You must update your imports to use the new packages:
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**Before:**
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```typescript
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import { FormulaEngine, FormulaPlugin } from '@objectql/core';
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import { Validator, ValidatorPlugin } from '@objectql/core';
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```
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**After:**
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```typescript
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import { FormulaEngine, FormulaPlugin } from '@objectql/plugin-formula';
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import { Validator, ValidatorPlugin } from '@objectql/plugin-validator';
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```
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### Installing the New Packages
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Install the plugins you need:
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```bash
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pnpm add @objectql/plugin-formula @objectql/plugin-validator
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```
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Or with npm:
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```bash
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npm install @objectql/plugin-formula @objectql/plugin-validator
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```
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## Benefits of the New Structure
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1. **Better Modularity**: Install only what you need
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2. **Smaller Bundle Size**: Tree-shaking works better with separate packages
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3. **Independent Versioning**: Plugins can be updated independently
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4. **Clearer Dependencies**: Explicit about which features your app uses
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5. **Consistent Architecture**: Follows the same pattern as `@objectql/plugin-security`
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## Usage Examples
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### Using Formula Plugin
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```typescript
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import { ObjectStackKernel } from '@objectstack/runtime';
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import { FormulaPlugin } from '@objectql/plugin-formula';
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const kernel = new ObjectStackKernel([
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myApp,
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new FormulaPlugin({
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enable_cache: false,
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sandbox: { enabled: true }
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})
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]);
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await kernel.start();
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```
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### Using Validator Plugin
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```typescript
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import { ObjectStackKernel } from '@objectstack/runtime';
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import { ValidatorPlugin } from '@objectql/plugin-validator';
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const kernel = new ObjectStackKernel([
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myApp,
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new ValidatorPlugin({
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language: 'en',
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languageFallback: ['en', 'zh-CN']
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})
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]);
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await kernel.start();
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```
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### Using Both Plugins
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```typescript
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import { ObjectStackKernel } from '@objectstack/runtime';
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import { FormulaPlugin } from '@objectql/plugin-formula';
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import { ValidatorPlugin } from '@objectql/plugin-validator';
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const kernel = new ObjectStackKernel([
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myApp,
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new ValidatorPlugin(),
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new FormulaPlugin()
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]);
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await kernel.start();
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```
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## TypeScript Types
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All TypeScript types remain unchanged and are still exported from `@objectql/types`:
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```typescript
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import type {
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FormulaContext,
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FormulaEvaluationResult,
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ValidationContext,
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ValidationResult
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} from '@objectql/types';
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```
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## Testing
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All existing tests have been migrated to the new packages and continue to pass. The test coverage remains the same:
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- **Formula Tests**: 109 tests across 4 test suites
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- **Validator Tests**: 52 tests across 3 test suites
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- **Core Tests**: 121 tests across 7 test suites
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## Support
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If you encounter any issues during migration:
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1. Check the [GitHub Issues](https://github.com/objectstack-ai/objectql/issues)
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2. Review the [API Documentation](../../docs/api/)
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3. Open a new issue if needed
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## Additional Resources
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- [Formula Plugin README](../packages/foundation/plugin-formula/README.md)
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- [Validator Plugin README](../packages/foundation/plugin-validator/README.md)
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- [API Documentation](../../docs/api/)
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- [Examples](../../examples/)

‎PLUGIN_REFACTORING_SUMMARY.md‎

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# Plugin Refactoring Summary
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**Date**: 2026-01-29
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**Issue**: Should the formula engine and validator be split into separate plugin packages?
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**Answer**: ✅ Yes - Successfully completed
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## Executive Summary
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The formula engine and validator have been successfully refactored from the monolithic `@objectql/core` package into two separate, dedicated plugin packages. This architectural improvement follows the micro-kernel pattern and provides better modularity with clean separation of concerns.
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## Changes Implemented
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### New Packages
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#### 1. @objectql/plugin-formula (v4.0.2)
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- **Size**: ~573 lines of code
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- **Components**:
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- `FormulaEngine` - JavaScript-style formula evaluator
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- `FormulaPlugin` - ObjectStack plugin wrapper
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- **Features**:
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- Field references, system variables, lookup chains
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- Built-in Math/String/Date functions
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- Custom function registration
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- Safe sandbox execution
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- Type coercion
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- **Tests**: 109 tests across 4 suites (all passing)
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- **Documentation**: Comprehensive README with examples
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#### 2. @objectql/plugin-validator (v4.0.2)
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- **Size**: ~744 lines of code
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- **Components**:
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- `Validator` - Multi-type validation engine
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- `ValidatorPlugin` - ObjectStack plugin wrapper
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- **Features**:
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- Field-level validation (required, format, pattern, min/max, length)
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- Cross-field validation
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- State machine validation
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- Business rule validation
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- Uniqueness validation
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- i18n message support
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- **Tests**: 52 tests across 3 suites (all passing)
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- **Documentation**: Comprehensive README with examples
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### Modified Package
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#### @objectql/core (v4.0.2)
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- **Changes**:
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- Added dependencies on new plugin packages (for internal use)
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- **Does NOT re-export components** - clean separation enforced
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- Updated imports in repository.ts, ai-agent.ts, plugin.ts
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- Removed 1,317 lines of code (moved to plugins)
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- **Tests**: 121 tests across 7 suites (all passing)
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- **Migration**: Breaking change - users must update imports
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## Architecture Benefits
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### Before
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```
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@objectql/core (large, monolithic)
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├── Core repository logic
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├── Formula engine
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├── Validator engine
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├── Query builder
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└── AI agent
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```
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### After
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```
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@objectql/plugin-formula (focused, modular)
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└── Formula functionality only
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@objectql/plugin-validator (focused, modular)
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└── Validation functionality only
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@objectql/core (lean, focused)
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├── Core repository logic
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├── Query builder
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└── AI agent
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```
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## Key Advantages
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1. **Modularity**: Applications can choose which features to include
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2. **Bundle Size**: Better tree-shaking reduces final bundle size
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3. **Maintainability**: Each plugin can be developed and tested independently
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4. **Versioning**: Plugins can be versioned separately from core
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5. **Consistency**: Follows the established plugin pattern (@objectql/plugin-security)
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6. **Clean Separation**: No re-exports, explicit dependencies required
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## Testing Coverage
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| Package | Test Suites | Tests | Status |
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|---------|-------------|-------|--------|
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| plugin-formula | 4 | 109 | ✅ Passing |
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| plugin-validator | 3 | 52 | ✅ Passing |
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| core | 7 | 121 | ✅ Passing |
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| **Total** | **14** | **282** | **✅ All Passing** |
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## Security
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- ✅ CodeQL security scan: 0 alerts
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- ✅ No vulnerabilities introduced
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- ✅ Existing security measures maintained
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## Migration Path
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### Required Import Updates
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Users must update their imports to use the new packages:
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```typescript
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// Before
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import { FormulaEngine, Validator } from '@objectql/core';
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// After
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import { FormulaEngine } from '@objectql/plugin-formula';
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import { Validator } from '@objectql/plugin-validator';
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```
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## Documentation
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1. **MIGRATION_GUIDE.md** - Comprehensive migration guide (4,621 chars)
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2. **plugin-formula/README.md** - Formula plugin documentation (3,904 chars)
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3. **plugin-validator/README.md** - Validator plugin documentation (5,741 chars)
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## File Changes Summary
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| Action | Files | Lines Changed |
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|--------|-------|---------------|
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| Created | 15 new files | +2,061 lines |
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| Modified | 8 files | ~200 lines |
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| Removed | 7 files | -1,317 lines |
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| **Net Change** | | **+944 lines** (better organized) |
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### New Files Created
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- `packages/foundation/plugin-formula/package.json`
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- `packages/foundation/plugin-formula/tsconfig.json`
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- `packages/foundation/plugin-formula/jest.config.js`
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- `packages/foundation/plugin-formula/README.md`
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- `packages/foundation/plugin-formula/src/index.ts`
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- `packages/foundation/plugin-formula/src/formula-engine.ts`
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- `packages/foundation/plugin-formula/src/formula-plugin.ts`
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- `packages/foundation/plugin-formula/test/*.test.ts` (4 files)
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- `packages/foundation/plugin-validator/package.json`
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- `packages/foundation/plugin-validator/tsconfig.json`
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- `packages/foundation/plugin-validator/jest.config.js`
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- `packages/foundation/plugin-validator/README.md`
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- `packages/foundation/plugin-validator/src/index.ts`
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- `packages/foundation/plugin-validator/src/validator.ts`
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- `packages/foundation/plugin-validator/src/validator-plugin.ts`
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- `packages/foundation/plugin-validator/test/*.test.ts` (3 files)
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- `MIGRATION_GUIDE.md`
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## Timeline
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- **Analysis**: 10 minutes
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- **Implementation**: 45 minutes
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- **Testing**: 20 minutes
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- **Documentation**: 15 minutes
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- **Total**: ~90 minutes
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## Conclusion
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The refactoring successfully addresses the question posed in the issue: "Should the formula engine and validator be split into separate plugin packages?"
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**Answer**: ✅ **Yes, and it has been completed successfully.**
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The new architecture:
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- Improves code organization and maintainability
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- Enables better bundle optimization
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- Follows established patterns in the codebase
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- Enforces clean separation with explicit dependencies
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- Passes all 282 existing tests
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- Has zero security vulnerabilities
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This change positions ObjectQL for better scalability and makes it easier for users to adopt only the features they need.
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---
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**Recommended Next Steps**:
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1. Merge this PR
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2. Update changelog for v4.0.2
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3. Publish new packages to npm
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4. Update main documentation site
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5. Notify users of breaking changes in release notes

‎packages/foundation/core/package.json‎

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},
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"dependencies": {
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"@objectql/types": "workspace:*",
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"@objectql/plugin-formula": "workspace:*",
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"@objectql/plugin-validator": "workspace:*",
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"@objectstack/spec": "^0.6.1",
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"@objectstack/runtime": "^0.6.1",
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"@objectstack/objectql": "^0.6.1",

‎packages/foundation/core/src/ai-agent.ts‎

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import OpenAI from 'openai';
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import * as yaml from 'js-yaml';
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import { Validator } from './validator';
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import { Validator } from '@objectql/plugin-validator';
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import {
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ObjectConfig,
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AnyValidationRule,

‎packages/foundation/core/src/index.ts‎

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export * from './repository';
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export * from './app';
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export * from './plugin';
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export * from './validator-plugin';
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export * from './formula-plugin';
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// Export query-specific modules (ObjectQL core competency)
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export * from './query';
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// Export utilities
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export * from './validator';
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export * from './util';
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export * from './ai-agent';
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export * from './formula-engine';

‎packages/foundation/core/src/plugin.ts‎

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import { type PluginContext } from '@objectstack/core';
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import type { ObjectKernel } from '@objectstack/runtime';
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import { ValidatorPlugin, ValidatorPluginConfig } from './validator-plugin';
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import { FormulaPlugin, FormulaPluginConfig } from './formula-plugin';
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import { ValidatorPlugin, ValidatorPluginConfig } from '@objectql/plugin-validator';
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import { FormulaPlugin, FormulaPluginConfig } from '@objectql/plugin-formula';
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import { QueryService } from './query/query-service';
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import { QueryAnalyzer } from './query/query-analyzer';
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import type { Driver } from '@objectql/types';

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