async-flag

async-flag

Promise based flag for asynchronous condition, for javascript/Nodejs

npm i async-flag

Basic

const AsyncFlag = require('async-flag')
let flag = new AsyncFlag()

//Set the flag somewhere else
setTimeout(() => flag.set('hello'), 10)

//wait for the flag
let result = await flag.get() //result will be 'hello'

Error case

let flag = new AsyncFlag('my-conditiopn')

//Set the error somewhere else
setTimeout(() => flag.error('something wrong'), 10)

flag.get().catch(console.error) //prints 'something wrong'

Timeout

let flag = new AsyncFlag('myFlag')
setTimeout(() => flag.set('hello'), 500)

flag.get(10).catch(console.log)		//expected timeout, prints: "AsyncFlag timeout: myFlag"
flag.get(100).catch(console.log)	//expected timeout, prints: "AsyncFlag timeout: myFlag"
flag.get(1000).then(console.log).catch(console.error)	//expected resolve, prints "hello"
flag.get(1000).then(console.log).catch(console.error)	//expected resolve, prints "hello"

Reset

let flag = new AsyncFlag()
flag.set('hello')
assert('hello' === await flag.get())
flag.reset()  //reset the promise.
flag.set('hello3')
assert('hello3' === await flag.get())