objcast

import { Caster } from 'objcast';

const caster = new Caster(), // any[]
  cast = () => 'abc';

caster.push(cast);

caster.cast((c: Function) => c()).then(r => {
  console.log(r); // ['abc']
  caster.remove(cast); // -1 = false, >= 0 = true
}); // Promise<any[]>