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always-callback
Advanced tools
Create callback api for given sync function. Guarantee that given function (sync or async, no matter) will always have callback api and will handle errors correctly.
Create callback api for given sync function. Guarantee that given function (sync or async, no matter) will always have callback api and will handle errors correctly.
npm i always-callback --save
npm test
For more use-cases see the tests
<fn>
{Function} function to transformreturn
{Function} async function that must have callbackIt is useful for control-flow and hybrid APIs
Example
var fs = require('fs')
var alwaysCallback = require('always-callback')
// if sync function given, transform it to async
var parse = alwaysCallback(JSON.parse)
var stringify = alwaysCallback(JSON.stringify)
var readFile = alwaysCallback(fs.readFileSync)
// if asynchronous function given, it remains async
var statFile = alwaysCallback(fs.stat)
parse('{"foo":"bar"}', function (err, res) {
console.log(err) //=> null
console.log(res) //=> { foo: 'bar' }
})
stringify({foo: 'bar', baz: 'qux'}, null, 2, function (err, res) {
//=> it would prettify and stringify json
console.log(err) //=> null
console.log(res)
//=> {
// "foo": "bar",
// "baz": "qux"
// }
})
readFile('./package.json', 'utf8', function (err, res) {
console.log(err) //=> null
console.log(res) //=> { name: 'always-callback', ... }
})
statFile('./package.json', function (err, res) {
console.log(err) //=> null
console.log(res) //=> { dev: 64770, mode: 33204, ... }
})
hybridify
. Handle callback in promise - give promise and callback return promise.callback
or cb
exists in function arguments.is-async-function
. Check that given function is synchronous.Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.
1.0.0 - 2015-06-05
related
sectionFAQs
Create callback api for given sync function. Guarantee that given function (sync or async, no matter) will always have callback api and will handle errors correctly.
The npm package always-callback receives a total of 1 weekly downloads. As such, always-callback popularity was classified as not popular.
We found that always-callback demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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