waiter-promise -- an enhanced promise library
Waiter is one of Deferred implementation, but with more helpful properties. We split Promise's resolve and reject method out of the declaration, know about settled status, and get result of resolve or reason of reject anytime.
install
npm i -S waiter-promise
# or with yarn
yarn add waiter-promiseuse
Use in JavaScript Promise:
import Waiter from 'waiter-promise'
const waiterA = new Waiter()
console.log(waiterA.settled) // -> false
waiterA.then(() => {
console.log(waiterA.result, waiterA.settled) // -> something result, true
})
const waiterB = new Waiter()
waiterB.catch(() => {
console.log(waiterB.reason, waiterB.settled) // -> reject reason, true
})
waiterA.resolve('something result')
waiterB.reject('reject reason')Use with async/await:
import Waiter from 'waiter-promise'
const waiter = new Waiter<string>()
const receive = async (): Promise<void> => {
const res = await waiter.promise
console.log(res)
}
const send = () => waiter.resolve('hello world')
send()
receive() // output: hello world