rsdi

RSDI - Dependency Injection Container

Getting Started

import DIContainer, { object, get, value, factory, IDIContainer } from "rsdi";

const config = {
    "ENV": value("PRODUCTION"),               // define raw value
    "AuthStorage": object(AuthStorage).construct(
       get("Storage")                         // refer to another dependency       
    ),
    "Storage": object(CookieStorage),         // constructor without arguments    
    "dateFormatter": factory(dateFormatter),  // factory   
    "BrowserHistory": factory(configureHistory).singleton(), // factory singleton  
};
const container = new DIContainer();
container.addDefinitions(config);

function dateFormatter(date: Date) {
  return moment(date).format("ddd, DD MMM YYYY");
}
function configureHistory(container: IDIContainer): History {
    // this factory will be called only once
    const history = createBrowserHistory();
    const env = container.get("ENV");
    if (env === "production") {
        // do what you need
    }
    return history;
}

// in your code

const env = container.get<string>("ENV"); // PRODUCTION
const authStorage = container.get<AuthStorage>("AuthStorage");  // object of AuthStorage
const history = container.get<History>("BrowserHistory");  // History singleton will be returned

Motivation

Popular solution like inversify or tsyringe use reflect-metadata that allows to fetch argument types and based on that types and do autowiring. I like autowiring but the I don't like the means by which we achieve it. I don't like

1. Those solutions in fact can deal only with typescript only. Since they rely on argument types that we don't have in JS.
2. I have to update my tsconfig because of one package.
3. Let my components know about injections

@injectable()
class Foo {  
}

Why component Foo should know that it's injectable?

More details thoughts in my blog article