await-to-js

Async await wrapper for easy error handling without try-catch
Under MIT License
By scopsy

async async-await es2017 try-catch

await-to-js

Async await wrapper for easy error handling

Pre-requisites

You need to use Node 7.6 (or later) or an ES7 transpiler in order to use async/await functionality.
You can use babel or typescript for that.

Install

sh npm i await-to-js --save

Usage

```js
import to from 'await-to-js';
// If you use CommonJS (i.e NodeJS environment), it should be:
// const to = require('await-to-js').default;

async function asyncTaskWithCb(cb) {
let err, user, savedTask, notification;

 [ err, user ] = await to(UserModel.findById(1));
 if(!user) return cb('No user found');
 [ err, savedTask ] = await to(TaskModel({userId: user.id, name: 'Demo Task'}));
 if(err) return cb('Error occurred while saving task');
if(user.notificationsEnabled) {
 [ err ] = await to(NotificationService.sendNotification(user.id, 'Task Created'));
 if(err) return cb('Error while sending notification');
}
if(savedTask.assignedUser.id !== user.id) {
 [ err, notification ] = await to(NotificationService.sendNotification(savedTask.assignedUser.id, 'Task was created for you'));
 if(err) return cb('Error while sending notification');
}
cb(null, savedTask);

}

async function asyncFunctionWithThrow() {
const [err, user] = await to(UserModel.findById(1));
if (!user) throw new Error('User not found');

}
```

TypeScript usage

```javascript
interface ServerResponse {
test: number;
}

const p = Promise.resolve({test: 123});

const [err, data] = await to(p);
console.log(data.test);
```

License