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408 B

"use strict"
var next = (global.process && process.nextTick) || global.setImmediate || function (f) {
setTimeout(f, 0)
}
module.exports = function maybe (cb, promise) {
if (cb) {
promise
.then(function (result) {
next(function () { cb(null, result) })
}, function (err) {
next(function () { cb(err) })
})
return undefined
}
else {
return promise
}
}