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'use strict'
module.exports = inflight
let Bluebird
try {
Bluebird = require('bluebird')
} catch (_) {
Bluebird = Promise
}
const active = {}
inflight.active = active
function inflight (unique, doFly) {
return Bluebird.all([unique, doFly]).then(function (args) {
const unique = args[0]
const doFly = args[1]
if (Array.isArray(unique)) {
return Bluebird.all(unique).then(function (uniqueArr) {
return _inflight(uniqueArr.join(''), doFly)
})
} else {
return _inflight(unique, doFly)
}
})
function _inflight (unique, doFly) {
if (!active[unique]) {
active[unique] = (new Bluebird(function (resolve) {
return resolve(doFly())
}))
active[unique].then(cleanup, cleanup)
function cleanup() { delete active[unique] }
}
return active[unique]
}
}