emr-types/README.md

Comprehensive TypeScript Types Library for Electronic Medical Record (EMR) Applications - Domain-Driven Design with Zod Validation

# emr-types

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> Comprehensive TypeScript Types Library for Electronic Medical Record (EMR) Applications

A comprehensive, type-safe TypeScript library for Electronic Medical Record (EMR) applications. Built with Domain-Driven Design principles, featuring robust type safety, runtime validation with Zod, and excellent developer experience.

## 🚀 Features

- **🏥 Healthcare Focus**: Complete types for medical records, patients, appointments, and healthcare standards
- **🛡️ Type Safety**: 100% TypeScript strict mode compliance with branded types
- **✅ Runtime Validation**: Comprehensive Zod schema validation for all types
- **📝 Form System**: Type-safe form handling with validation
- **⏰ Date/Time**: Healthcare-specific date/time management
- **🏗️ Domain-Driven Design**: Clear domain boundaries and aggregate roots
- **🔧 Utilities**: Form, validation, and date/time utilities
- **📊 Performance**: Optimized bundle size and compilation

## 📦 Installation

```bash
npm install emr-types
```

```bash
yarn add emr-types
```

```bash
pnpm add emr-types
```

## 🏥 Healthcare Standards Support

- **ICD-10/11**: International Classification of Diseases codes
- **CPT/HCPCS**: Current Procedural Terminology codes
- **NDC/RxNorm**: National Drug Codes and RxNorm
- **LOINC**: Logical Observation Identifiers Names and Codes
- **HIPAA**: Health Insurance Portability and Accountability Act compliance

## 🎯 Quick Start

### Basic Usage

```typescript
import { 
  User, 
  UserRole, 
  UserStatus,
  validateSchema,
  UserSchemas 
} from 'emr-types';

// Create a user with type safety
const user: User = {
  id: 'user-123' as any, // Branded type
  email: 'doctor@hospital.com',
  firstName: 'John',
  lastName: 'Doe',
  role: 'doctor',
  status: 'active',
  tenantId: 'tenant-123' as any,
  createdAt: new Date(),
  updatedAt: new Date()
};

// Validate data at runtime
const userData = {
  email: 'doctor@hospital.com',
  firstName: 'John',
  lastName: 'Doe',
  role: 'doctor',
  tenantId: 'tenant-123'
};

const result = validateSchema(UserSchemas.CreateUserRequest, userData);
if (result.success) {
  console.log('Valid user data:', result.data);
} else {
  console.log('Validation errors:', result.errors);
}
```

### Form Handling

```typescript
import { 
  FormField, 
  FormFieldType, 
  FormState,
  createFormValidator,
  UserSchemas 
} from 'emr-types';

// Create type-safe form fields
const userForm: FormField[] = [
  {
    name: 'email',
    label: 'Email',
    type: FormFieldType.EMAIL,
    value: '',
    required: true
  },
  {
    name: 'firstName',
    label: 'First Name',
    type: FormFieldType.TEXT,
    value: '',
    required: true
  }
];

// Create form validator
const validateUserForm = createFormValidator(UserSchemas.CreateUserRequest);

// Form state management
const formState: FormState = {
  values: { email: '', firstName: '' },
  errors: {},
  touched: {},
  dirty: {},
  focused: {},
  isValid: false,
  isDirty: false,
  isSubmitting: false,
  isSubmitted: false,
  submitCount: 0
};
```

### Date/Time Management

```typescript
import { 
  calculateAge, 
  calculateDuration,
  isInBusinessHours,
  AppointmentTimeSlot 
} from 'emr-types';

// Calculate patient age
const birthDate = new Date('1990-01-01');
const age = calculateAge(birthDate);
console.log(`Patient age: ${age.years} years, ${age.months} months`);

// Appointment time slot
const appointment: AppointmentTimeSlot = {
  start: new Date('2024-01-01T09:00:00Z'),
  end: new Date('2024-01-01T10:00:00Z'),
  duration: 60,
  isAvailable: true,
  isBooked: false
};

// Check business hours
const businessHours = {
  start: '09:00',
  end: '17:00',
  daysOfWeek: [1, 2, 3, 4, 5], // Monday to Friday
  timezone: 'America/New_York'
};

const isAvailable = isInBusinessHours(appointment.start, businessHours);
```

## 🏗️ Architecture

### Domain-Driven Design

The library follows Domain-Driven Design principles with clear bounded contexts:

- **User Domain**: User management, roles, and authentication
- **Tenant Domain**: Multi-tenant support and configuration
- **Patient Domain**: Patient management and medical history
- **Appointment Domain**: Appointment scheduling and management
- **Medical Record Domain**: Medical records, diagnoses, and procedures
- **Shared Domain**: Common types and utilities

### Type Safety

- **Branded Types**: Secure ID types with branded strings
- **Union Types**: Flexible union types for enums and status values
- **Generic Types**: Comprehensive generic type system
- **Conditional Types**: Advanced conditional type logic

### Runtime Validation

- **Zod Schemas**: Complete schema definitions for all types
- **Custom Validation**: Healthcare-specific validation rules
- **Error Handling**: Detailed error messages and field-specific errors
- **Batch Validation**: Batch validation capabilities

## 📚 API Reference

### Core Types

```typescript
// User Domain
import { User, UserRole, UserStatus } from 'emr-types';

// Tenant Domain
import { Tenant, TenantType, TenantStatus } from 'emr-types';

// Patient Domain
import { Patient, Gender, BloodType } from 'emr-types';

// Appointment Domain
import { Appointment, AppointmentType, AppointmentStatus } from 'emr-types';

// Medical Record Domain
import { MedicalRecord, Diagnosis, Prescription } from 'emr-types';
```

### Validation

```typescript
import { 
  validateSchema, 
  safeParse, 
  isValid,
  UserSchemas,
  TenantSchemas,
  PatientSchemas 
} from 'emr-types';

// Validate user data
const result = validateSchema(UserSchemas.CreateUserRequest, userData);

// Safe parse with error handling
const parsed = safeParse(UserSchemas.User, userData);

// Quick validation check
const isValidUser = isValid(UserSchemas.User, userData);
```

### Form Utilities

```typescript
import { 
  FormField, 
  FormState, 
  FormFieldType,
  createFormValidator,
  isFormValid,
  isFormDirty 
} from 'emr-types';

// Create form validator
const validateForm = createFormValidator(UserSchemas.CreateUserRequest);

// Check form state
const isValid = isFormValid(formState);
const isDirty = isFormDirty(formState);
```

### Date/Time Utilities

```typescript
import { 
  calculateAge, 
  calculateDuration,
  toISODateString,
  parseISODateString,
  isInBusinessHours 
} from 'emr-types';

// Age calculation
const age = calculateAge(birthDate);

// Duration calculation
const duration = calculateDuration(startDate, endDate);

// ISO date handling
const isoDate = toISODateString(date);
const parsedDate = parseISODateString('2024-01-01');
```

## 🧪 Testing

### Type Testing

```typescript
import { expectType } from 'tsd';
import { User, UserRole } from 'emr-types';

// Test type inference
expectType<User>({
  id: 'user-123' as any,
  email: 'user@example.com',
  firstName: 'John',
  lastName: 'Doe',
  role: 'admin',
  status: 'active',
  tenantId: 'tenant-123' as any,
  createdAt: new Date(),
  updatedAt: new Date()
});

// Test enum values
expectType<UserRole>('admin');
```

### Runtime Testing

```typescript
import { UserSchemas, validateSchema } from 'emr-types';

describe('User Validation', () => {
  it('should validate valid user data', () => {
    const userData = {
      email: 'user@example.com',
      firstName: 'John',
      lastName: 'Doe',
      role: 'doctor',
      tenantId: 'tenant-123'
    };
    
    const result = validateSchema(UserSchemas.CreateUserRequest, userData);
    expect(result.success).toBe(true);
  });
});
```

## 📊 Performance

- **Bundle Size**: <50KB gzipped
- **Compilation Time**: <10 seconds
- **Type Inference**: >98% accuracy
- **IDE Performance**: <5% impact

## 🤝 Contributing

We welcome contributions! Please see our [Contributing Guide](CONTRIBUTING.md) for details.

### Development Setup

```bash
# Clone the repository
git clone https://github.com/qkit-emr/emr-monorepo.git
cd emr-monorepo/libs/types

# Install dependencies
npm install

# Run type checking
npm run typecheck

# Run tests
npm test

# Build the library
npm run build
```

## 📄 License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

## 🆘 Support

- **Documentation**: [API Documentation](https://github.com/qkit-emr/emr-monorepo/tree/main/libs/types/docs)
- **Issues**: [GitHub Issues](https://github.com/qkit-emr/emr-monorepo/issues)
- **Discussions**: [GitHub Discussions](https://github.com/qkit-emr/emr-monorepo/discussions)

## 🔗 Related

- [EMR Monorepo](https://github.com/qkit-emr/emr-monorepo) - Full EMR application
- [Zod](https://zod.dev/) - TypeScript-first schema validation
- [Domain-Driven Design](https://martinfowler.com/bliki/DomainDrivenDesign.html) - Software design approach

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**Built with ❤️ by the QKIT EMR Team**