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call-me-maybe 
Let your JS API users either give you a callback or receive a promise.
Usage
var maybe = require("call-me-maybe")
module.exports = function asyncFunc (cb) {
return maybe(cb, new Promise(function(resolve, reject) {
// ...
}))
}
API
maybe(cb, promise)
If the callback cb is truthy, returns undefined and will call cb when promise is settled. The parameters passed to cb are standard error-first:
- If
promiseis fulfilled, then it is called with the result of the promise:cb(null, result) - If
promiseis rejected, then it is called with the rejection error:cb(err)
If cb is falsey, then promise is retuned.