explicit-inject.js

const getFrom = container => prop => container[prop];

const createInstance = (factory, deps) =>
  deps.some(isPromise) 
    ? Promise.all(deps).then(resolvedDeps => factory(...resolvedDeps))
    : factory(...deps);

export const asFactory = (factory, inject = factory.inject) => container =>
  Array.isArray(inject)
    ? createInstance(factory, inject.map(getFrom(container)))
  typeof inject === 'function'
    ? createInstance(factory, inject(container))
  : factory(container);
 
export const asClass = (constructor, inject = constructor.inject) => asFactory(
  (...args) => Reflect.construct(contructor, args),
  inject
);