Problems async method

By chaining.

sign(food: string): Promise<string> {
  return ...;
}

seel(signed: string): Promise<string> {
  return ...;
}

deliver(seeled: string): void {
  ...;
}

signSeelAndDeliver(food: string): void  {
  sign(food)
    .then(signed => seel(signed))
    .then(seeled => deliver(seeled));
}