cocb

cocb let you use all your existing asynchronous functions that gets a "callback" in the form of function(error, data) in a sequential way using generators, all this without the need to promisify them.

So if you have a large scale project with lots of non-promised functions and you want to use a co style library - you can use cocb.

Installation

npm install cocb

Usage

cocb is a function in the form: function(function* (function(Error, Object))), meaning: cocb must get a generator function, which gets a next function which gets error and data. So this next function should be passed as the cb for all your async functions.

cocb() will return an object with a catch function in the form: function(function(Error)), meaning: the catch function should get an error handler function, this error handler will be called whenever next() has been called with an error.

Example

var cocb = require('cocb');

function getUser(email, cb) {
	setTimeout(() => {
		var data = {email: email, id: Date.now()};
		cb(null, data);
	}, 1000);
}

function getProjects(userId, cb) {
	setTimeout(() => {
		var data = {id: userId, projects: [2, 4, 6]};
		cb(null, data);
	}, 1000);
}

cocb(function* getUserProjects(next) {
	var email = 'Joe@gamil.com';
	console.log('Fetching user:', email);

	var user = yield getUser(email, next);

	console.log('Got user:', user);
	console.log('Fetching projects for user:', user.id);

	var projects = yield getProjects(user.id, next);
	console.log('Got projects:', projects);
}).catch((err) => {
	console.log('Got Error:', err);
});

/*
Output:
Fetching user: Joe@gamil.com
Got user: { email: 'Joe@gamil.com', id: 1483834229291 }
Fetching projects for user: 1483834229291
Got projects: { id: 1483834229291, projects: [ 2, 4, 6 ] }
*/

License

MIT