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'use strict'
module.exports.promisify = promisify
function promisify (f) {
const util = require('util')
if (util.promisify) {
return util.promisify(f)
} else {
return function () {
return new Promise((resolve, reject) => {
f.apply(this, [].slice.call(arguments).concat((err, val) => {
err ? reject(err) : resolve(val)
}))
})
}
}
}