Example of "inversion of control" or aspect oriented programming in JavaScript

container.js

const Container = {
  _storage: {},
  register(key, deps, func) {
    this._storage[key] = { deps, func };
  },
  get(key) {
    if (!this._storage[key]) throw new Error(`Missing ${key}`);
    const { func, deps } = this._storage[key];
    return (...args) => {
      const resolvedDeps = deps.map((key) => this.get(key));
      return func(...resolvedDeps, ...args);
    };
  },
};

/**
With that, we can start and register our dependencies. The first will be settings and then the Service.
*/

// Example 
Container.register('settings', , () => {
  return { fb: { key: 'xxx' } }
});
Container.register('client', ['settings'], (settings) => {
  return new Service({ APIKey: settings().fb.key });
});

Container.register('postToFacebook', ['client'], async (client, message) => {
  const result = await client().post(message);
  return result;
});

// Then to use our new dependency injection container
const publish = container.get('postToFacebook');

publish('What a beautiful day!');