The Basics (JavaScript)

It is recommended to use TypeScript for the best development experience but you can use plain JavaScript if you prefer. The following code snippet implements the previous example without TypeScript in Node.js v5.71:

var inversify = require("inversify");
require("reflect-metadata");

var TYPES = {
    Ninja: "Ninja",
    Katana: "Katana",
    Shuriken: "Shuriken"
};

class Katana {
    hit() {
        return "cut!";
    }
}

class Shuriken {
    throw() {
        return "hit!";
    }
}

class Ninja {
    constructor(katana, shuriken) {
        this._katana = katana;
        this._shuriken = shuriken;
    }
    fight() { return this._katana.hit(); };
    sneak() { return this._shuriken.throw(); };
}

// Declare as injectable and its dependencies
inversify.decorate(inversify.injectable(), Katana);
inversify.decorate(inversify.injectable(), Shuriken);
inversify.decorate(inversify.injectable(), Ninja);
inversify.decorate(inversify.inject(TYPES.Katana), Ninja, 0);
inversify.decorate(inversify.inject(TYPES.Shuriken), Ninja, 1);

// Declare bindings
var container = new inversify.Container();
container.bind(TYPES.Ninja).to(Ninja);
container.bind(TYPES.Katana).to(Katana);
container.bind(TYPES.Shuriken).to(Shuriken);

// Resolve dependencies
var ninja = container.get(TYPES.Ninja);
return ninja;