@brainstack/inject
v1.2.145
Published
A Micro Dependency Injection Package
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Readme
@brainstack/inject
A lightweight dependency injection library for JavaScript and TypeScript, designed to facilitate dependency management and injection in your projects.
Installation
You can install the package using npm:
npm install @brainstack/inject
Usage
Import the inject
function and use it to create a dependency container. You can then register and get for dependencies in the container.
Importing
import { inject } from '@brainstack/inject';
Creating a Dependency Container
const container = inject();
Registering a Dependency
interface Logger {
log(message: string): void;
}
class ConsoleLogger implements Logger {
log(message: string) {
console.log(message);
}
}
const logger = new ConsoleLogger();
const unregister = container.register<Logger>('logger', logger);
Getting a Dependency
const retrievedLogger = container.get<Logger>('logger');
retrievedLogger.log('Hello, world!');
Examples
Example 1: Registering and Retrieving a Logger Service
import { inject } from '@brainstack/inject';
const container = inject();
interface Logger {
log(message: string): void;
}
class ConsoleLogger implements Logger {
log(message: string) {
console.log(message);
}
}
const logger = new ConsoleLogger();
container.register<Logger>('logger', logger);
const retrievedLogger = container.get<Logger>('logger');
retrievedLogger.log('Hello, world!');
In this example, we define a Logger
interface and create a ConsoleLogger
class that implements this interface. We then register an instance of ConsoleLogger
with the ID 'logger'
in the dependency container. Finally, we retrieve the logger service using the get
method and use it to log a message.
API
inject()
Creates a new dependency container.
Returns: Dependency container object with methods.
register<T>(id: string, instance: T): () => void
Registers a new dependency in the container.
id
: The ID of the dependency.instance
: The instantiated object of the dependency.
Returns: A function to unregister the API section of the README.md file:
get<T>(id: string): T | undefined
Gets a dependency from the container by its ID.
id
: The ID of the dependency.
Returns: The retrieved dependency or undefined
if not found.
Contributing
Contributions are welcome! If you would like to contribute to this module, please follow these guidelines:
Fork the repository Create a new branch for your changes Make your changes and commit them with descriptive commit messages Push your changes to your fork Submit a pull request
License
This module is released under the MIT License.