dilight
Lightweight ES5 compatible Dependency Injection Library
Installation
npm install @frank-mayer/dilightUsage
Construct a new DIContainer and register your services.
Keep in mind that the add methods return the same container instance (no new instance is created), but the type is updated with the new registered service.
Don't do this
const container = new DIContainer();
container.addTransient(Foo, "Foo");
container.addTransient(Bar, "Bar");Do this
const container = new DIContainer()
.addTransient(Foo, "Foo")
.addTransient(Bar, "Bar");Interface
You can also provide a different type for the service.
const container = new DIContainer()
.addTransient<Logger>(FileLogger, "Logger");Decorators
const container = new DIContainer()
.addTransient(Foo, "Foo");
const inject = makeDecorator(container);
class Foo {
@inject("Logger")
private logger: Logger;
}Full Example
import { DIContainer } from "@frank-mayer/dilight";
// Demo classes
class Foo { }
class Bar { }
class Baz {
constructor(param: number) { }
}
interface ILogger {
log(message: string): void;
}
class ConsoleLogger implements ILogger {
log(message: string): void {
console.log(message);
}
}
// register services
export const container = new DIContainer()
.addTransient(Foo, "Foo")
.addSingleton(Bar, "Bar")
.addFactory(() => new Baz(Math.random()), "Baz")
.addSingleton<ILogger>(ConsoleLogger, "ILogger");
// resolve services
const foo: Foo = container.resolve("Foo");
const bar: Bar = container.resolve("Bar");
const baz: Baz = container.resolve("Baz");
const baz: ILogger = container.resolve("ILogger");