Pipe so you don't pile .catch handlers in Promises

pipe.ts

export const pipe = function<T>(promise: Promise<T>, ...callbacks: ((value: T) => T|Promise<T>)[]): Promise<T> {
  let subject = promise;
  for (const i in callbacks) {
    subject = subject.then(callbacks[i])
  }
  return subject;
}

usage.ts

const doSomething = function(): Promise<number> {
  return new Promise((resolve, reject) => { resolve(5); });
}

pipe(
  doSomething(),
  (value) => value + 10,
  (value) => value - 2,
  (value) => value + 9,
  (value) => value / 2,
)
  .then(somethingElse)
  .catch(handleErrors)