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 = '[e-mail]';
    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: [e-mail]
Got user: { email: '[e-mail]', id: 1483834229291 }
Fetching projects for user: 1483834229291
Got projects: { id: 1483834229291, projects: [ 2, 4, 6 ] }
*/

License

MIT