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RobotlegsJS is a architecture-based IoC framework for JavaScript/TypeScript. This version is a direct port from the ActionScript 3.0 codebase. See the motivation behind it.

Right now, this framework has extensions for pixi.js v4, easeljs, openfl, phaser-ce v2 and phaser v3.


  • Dependency injection (through InversifyJS)

  • Command management

  • View management


Some companies using RobotlegsJS


You can get the latest release and the type definitions using NPM:

npm install @robotlegsjs/core reflect-metadata --save

Or using Yarn:

yarn add @robotlegsjs/core reflect-metadata

⚠️ Important! RobotlegsJS requires TypeScript >= 2.0 and the experimentalDecorators, emitDecoratorMetadata, types and lib compilation options in your tsconfig.json file.

    "compilerOptions": {
        "target": "es5",
        "lib": ["es6", "dom"],
        "types": ["reflect-metadata"],
        "module": "commonjs",
        "moduleResolution": "node",
        "experimentalDecorators": true,
        "emitDecoratorMetadata": true

RobotlegsJS requires a modern JavaScript engine with support for:

If your environment doesn't support one of these you will need to import a shim or polyfill.

⚠️ The reflect-metadata polyfill should be imported only once in your entire application because the Reflect object is mean to be a global singleton. More details about this can be found here.


Creating A Context

To create a Robotlegs application or module you need to instantiate a Context. A context won't do much without some configuration.

let renderer = PIXI.autoDetectRenderer(800, 600, {});
let context = new Context()
        .configure(MyAppConfig, SomeOtherConfig)
        .configure(new ContextView((<any>this.renderer).plugins.interaction));

We install the MVCSBundle, which in turn installs a number of commonly used Extensions. We then add some custom application configurations.

We pass the instance "this" through as the "contextView" which is required by many of the view related extensions. It must be installed after the bundle or it won't be processed. Also, it should always be added as the final configuration as it may trigger context initialization.

Note: You must hold on to the context instance or it will be garbage collected.

See Framework docs.

Context Initialization

If a ContextView is provided the Context is automatically initialized when the supplied view lands on stage. Be sure to install the ContextView last, as it may trigger context initialization.

If a ContextView is not supplied then the Context must be manually initialized.

let context = new Context()
        .configure(MyAppConfig, SomeOtherConfig)

Note: This does not apply to Flex MXML configuration as the ContextView is automatically determined and initialization will be automatic.

See ContextView docs.

Application & Module Configuration

A simple application configuration file might look something like this:

import {
} from "@robotlegsjs/core";
public class MyAppConfig implements IConfig
    injector: IInjector;
    mediatorMap: IMediatorMap;
    commandMap: IEventCommandMap;
    contextView: IEventCommandMap;
    public function configure(): void
        // Map UserModel as a context enforced singleton
        // Create a UserProfileMediator for each UserProfileView
        // that lands inside of the Context View;
        // Execute UserSignInCommand when UserEvent.SIGN_IN
        // is dispatched on the context's Event Dispatcher;
        // The "view" property is a DisplayObjectContainer reference.
        this.contextView.view.addChild(new MainView());

The configuration file above implements IConfig. An instance of this class will be created automatically when the context initializes.

We Inject the utilities that we want to configure, and add our Main View to the Context View.

See Framework documentation

An Example Mediator

The mediator we mapped above might look like this:

import { inject, IEventMap, IEventDispatcher, Mediator } from "@robotlegsjs/core";
import { UserProfileView } from "./UserProfileView";
public class UserProfileMediator extends Mediator<UserProfileView>
    public function initialize():void
        // Redispatch an event from the view to the framework
        this.addViewListener(UserEvent.SIGN_IN, dispatch);

The view that caused this mediator to be created is available for Injection.


An Example Command

The command we mapped above might look like this:

import { Command, inject } from "@robotlegsjs/core";
public class UserSignInCommand extends Command
    event: UserEvent;
    model: UserModel;
    public function execute(): void
        if (event.username == "bob")
            model.signedIn = true;

The event that triggered this command is available for Injection.

See EventCommandMap docs.


There are many frameworks and patterns out there that helps you to write DOM-based applications. There is no scalable solution yet to architecture a canvas-based application though.

Robotlegs has proven itself of being a mature solution from the ActionScript community for interactive experiences.

RobotlegsJS for enterprise

Available as part of the Tidelift Subscription

The maintainers of @robotlegsjs/core and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. Learn more.




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