# TypeBuilder

TypeBuilder is a TypeScript-based library that implements the Builder design pattern, allowing for easy and flexible object creation with built-in validation using [Zod](https://github.com/colinhacks/zod). This library is useful for managing complex object configurations while ensuring that all properties meet specified validation criteria.

## Features

- **Builder Pattern**: Create complex objects step-by-step.
- **Validation**: Automatically validate properties using Zod schemas.
- **Type Safety**: Leverage TypeScript for type-safe code.
- **Flexibility**: Easily extendable to support new object types and schemas.

## Installation

To install TypeBuilder, use npm:

```bash
npm install @litpack/typebuilder

Or, if you prefer yarn:

yarn add @litpack/typebuilder

Usage

Creating a Builder

To create a new object using TypeBuilder, first define a Zod schema for the object:

import { createBuilder, z } from "@litpack/typebuilder";

// Define your Zod schema
const UserSchema = z.object({
  id: z.string(),
  name: z.string(),
  age: z.number().int().positive(),
  email: z.string().email(),
});

// Create a UserBuilder using the schema
const UserBuilder = createBuilder(UserSchema);

Building an Object

You can now use the builder to create a validated object:

try {
  const user = UserBuilder
    .setId("123e4567-e89b-12d3-a456-426614174000")
    .setName("Alice")
    .setAge(25)
    .setEmail("[email protected]")
    .build();

  console.log("User created:", user);
} catch (error) {
  console.error("Validation error:", error);
}

Available Methods

The UserBuilder automatically provides setter methods based on the Zod schema:

• setId(value: string)
• setName(value: string)
• setAge(value: number)
• setEmail(value: string)

Example

Here’s a complete example of using TypeBuilder with a simple User object:

import { createBuilder, z } from "@litpack/typebuilder";

// Define the User schema
const UserSchema = z.object({
  id: z.string(),
  name: z.string(),
  age: z.number().int().positive(),
  email: z.string().email(),
});

// Create a UserBuilder
const UserBuilder = createBuilder(UserSchema);

// Build a User object
try {
  const user = UserBuilder
    .setId("123e4567-e89b-12d3-a456-426614174000")
    .setName("Alice")
    .setAge(25)
    .setEmail("[email protected]")
    .build();

  console.log("User created:", user);
} catch (error) {
  console.error("Validation error:", error);
}

API Reference

• createBuilder(schema: ZodSchema): Function to create a builder based on the provided Zod schema.

Contributing

Contributions are welcome! If you'd like to contribute, please fork the repository and submit a pull request.

1. Fork the repository.
2. Create your feature branch (git checkout -b feature/YourFeature).
3. Commit your changes (git commit -m 'Add some feature').
4. Push to the branch (git push origin feature/YourFeature).
5. Open a pull request.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Author

Litpack

Acknowledgments

• Zod for providing a powerful validation library.
• TypeScript for enhancing JavaScript with static types.