Features

• Interface-based Dependency Injection: Use TypeScript interfaces as references for dependencies, ensuring strong type safety.
• Mapped Dependencies: Register and resolve multiple implementations of the same interface by key. This allows you to map different behaviors or strategies to specific identifiers and retrieve them dynamically at runtime based on context.
• Singleton and Transient Support: Easily configure lifetime scopes for your services.
• Minimal Setup: Get started quickly with a simple CLI.
• Easy to Extend: Open and flexible architecture.

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Getting Started

Installation

First, initialize Dipend in your project:

npx dipend init

This command will:

• Add Dipend and ts-patch to your package.json
• Update your tsconfig.json with necessary configuration
• Prepare your project for dependency injection

Then install dependencies:

npm install

Basic Usage

Here’s a simple example to show how Dipend works:

import { DependencyContainer } from "dipend";

// Define an interface
interface ILogger {
  info(message: string): void;
}

// Implement the interface
class Logger implements ILogger {
  public info(message: string) {
    console.info(`INFO: ${message}`);
  }
}

// Create a dependent class
class Greeter {
  constructor(private logger: ILogger) {}

  public greet(name: string): string {
    const message = `Hello, ${name}!`;
    this.logger.info(message);
    return message;
  }
}

// Create the container
const dependencyContainer = new DependencyContainer();

// Register dependencies
dependencyContainer.addSingleton<ILogger, Logger>();
dependencyContainer.addTransient<Greeter>();

// Build singletons (optional if you want them ready immediately)
dependencyContainer.buildSingletons();

// Resolve and use a dependency
const greeter = dependencyContainer.getDependency<Greeter>();
const result = greeter.greet("World");
console.log(result);

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More Examples

Looking for more use cases or advanced configurations?
Check out the full documentation.

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Why Dipend?

While many dependency injection libraries exist, Dipend is the only one (as of now) that fully supports using interfaces as references for dependency resolution without needing extra boilerplate or manual token management.

This means you can register and retrieve implementations by their interfaces directly, preserving clean principles while keeping your code strongly typed and maintainable.

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Contributing

Contributions make the open-source community such an amazing place to learn, inspire, and create. We warmly welcome your contributions!

Before contributing, please read the following:

• CONTRIBUTING GUIDELINES
• CONTRIBUTOR LICENSE AGREEMENT

If you like the project, don't forget to give it a ⭐️!

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License

Copyright 2025 Saulo V. Alvarenga. All rights reserved.

Licensed under the Apache License, Version 2.0.

See LICENSE for complete license information.

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