wait-then

wait-then

Utility function that returns a promise that resolves after x ms

Can be used as a yieldable with co or in koa.

Basic example:

var wait = require('wait-then'),
    timeout = wait.timeout;

wait(2000).then(function() {
    console.log('This is logged after 2 seconds');
});

timeout(2000).catch(e) {
    console.log('This is logged after 2 seconds');
}

Example with co:

var wait = require('wait-then'),
    timeout = wait.timeout,
    co = require('co');

co(function *() {
    yield wait(1000);
    console.log('This is logged after 1 second');
});

co(function *() {
    try {
        yield timeout(1000);
    } catch (e) {
        console.log('This is logged after 1 second');
    }
});

The generator function passed into co can be yielded in a middleware in koa.

Note: This relies on the existence of a global Promise object as defined in the ECMAScript 6 (Harmony) proposal.

How this differs from co-sleep and co-wait is that both of them use thunks, support for which is set to be deprecated. wait-then instead uses Promises, which are also yieldable.