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// given a function that resolves a result asynchronously.
// the function can either call passed-in success and failure callbacks,
// or it can return a promise.
// if you need to pass additional params to func, bind them first.
export function unpromisify(func, success, failure?) {
// guard against success/failure callbacks being called more than once
// and guard against a promise AND callback being used together.
let isResolved = false
let wrappedSuccess = function() {
if (!isResolved) {
isResolved = true
success.apply(this, arguments)
}
}
let wrappedFailure = function() {
if (!isResolved) {
isResolved = true
if (failure) {
failure.apply(this, arguments)
}
}
}
let res = func(wrappedSuccess, wrappedFailure)
if (res && typeof res.then === 'function') {
res.then(wrappedSuccess, wrappedFailure)
}
}