assured

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> Combine promises and callbacks together.

:cloud: Installation

``sh


Using npm

npm install --save assured

Using yarn

yarn add assured
`

:clipboard: Example

`js
const assured = require("assured");

let foo = (age, cb) => {

// Swap the callback function
if (typeof age === "function") {
cb = age;
}

// Proxy the callback function
cb = assured(cb);

// Validate the age
if (typeof age !== "number") {
cb(new Error("Invalid age."));
} else {
// Do something async
setTimeout(() => {
cb(null, The provided age is ${age});
}, 100);
}

// Return the promise
return cb._;
}

// Callback interface + error
foo(err => console.log(err));
// => [Error: Invalid age.]

// Callback interface + success
foo(42, (err, data) => console.log(err, data));
// => null 'The provided age is 42'

// Promise interface + error
foo().then(x => {
console.log("Success: ", x);
}).catch(e => {
console.log("Error: ", e);
// => Error: [Error: Invalid age.]
});

// Promise + Success
foo(42).then(x => {
console.log("Success: ", x);
}).catch(e => {
console.log("Error: ", e);
});


// Async - Await
(async () => {
const res = await foo(32)
console.log(res);
})()
`




:question: Get Help

There are few ways to get help:

1. Please post questions on Stack Overflow. You can open issues with questions, as long you add a link to your Stack Overflow question.
2. For bug reports and feature requests, open issues. :bug:
3. For direct and quick help, you can use Codementor. :rocket:

:memo: Documentation




$3

Proxies the callback function.

#### Params

- Function fn: The callback function to proxy.
- Promise p: A custom promise constructor (default: the built-in Promise).

#### Return
- Function The proxied callback function extended with:
- resolver (Function): The promise resolver.
- assuredResolve (Function): The resolve method.
- assuredReject (Function): The reject method.
- _ (Promise): The promise object (used to return from your function).




:yum: How to contribute

Have an idea? Found a bug? See [how to contribute][contributing].

:sparkling_heart: Support my projects

I open-source almost everything I can, and I try to reply to everyone needing help using these projects. Obviously,
this takes time. You can integrate and use these projects in your applications for free! You can even change the source code and redistribute (even resell it).

However, if you get some profit from this or just want to encourage me to continue creating stuff, there are few ways you can do it:


- Starring and sharing the projects you like :rocket:
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Thanks! :heart:




:dizzy: Where is this library used?

If you are using this library in one of your projects, add it in this list. :sparkles:

- @kazesolo/scraped
- @slikts/scrape-it
- bloggify-plugin-class
- bloggify-plugin-loader
- csv-it
- fn-result
- fs-file-tree
- scrape-it
- scrape-it-plus
- tinyreq`

:scroll: License

[MIT][license] © [Ionică Bizău][website]

[license]: /LICENSE
[website]: https://ionicabizau.net
[contributing]: /CONTRIBUTING.md
[docs]: /DOCUMENTATION.md
[badge_patreon]: https://ionicabizau.github.io/badges/patreon.svg
[badge_amazon]: https://ionicabizau.github.io/badges/amazon.svg
[badge_paypal]: https://ionicabizau.github.io/badges/paypal.svg
[badge_paypal_donate]: https://ionicabizau.github.io/badges/paypal_donate.svg
[patreon]: https://www.patreon.com/ionicabizau
[amazon]: http://amzn.eu/hRo9sIZ
[paypal-donations]: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=RVXDDLKKLQRJW