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 promise is fulfilled, then it is called with the result of the promise: cb(null, result)
• If promise is rejected, then it is called with the rejection error: cb(err)

If cb is falsey, then promise is retuned.