I don't think this will work in JavaScript because that while loop will block the event loop and prevents callback from executing. For example, the following code will be blocked when running in Node.js:
function delayedValue(val, ms) {
return new Promise(resolve => setTimeout(() => resolve(val), ms))
}
function syncFn() {
let result
let state = 'pending'
delayedValue(1234, 500)
.then(data => {
result = data
state = 'fulfilled'
})
.catch(error => {
result = error
state = 'rejected'
})
while (state == 'pending') {}
return result
}
console.log('before')
console.log(syncFn())
console.log('after')
