Loader hooks API surface

gistfile1.ts

interface LoadRequest {
  name: string;
  address?: string;
  source?: string;
  metadata: Object;
}

interface Eventual<T> = T | Promise<T>;

interface ModuleInstantiator {
  deps: string[];
  execute(): Reflect.Module;
}

interface LoaderHooks {
  normalize(string): Eventual<string>;
  locate(LoadRequest): Eventual<string>;
  fetch(LoadRequest): Eventual<string>;
  translate(LoadRequest): Eventual<string>;
  instantiate(LoadRequest): ModuleInstantiator;
}

interface SystemClass extends Loader, LoaderHooks {
}

interface GlobalSystem {
  System: SystemClass;
}

Window implements GlobalSystem;