Tiny library to promisify functions expecting node-style callbacks
npm install tiny-promisifyMinimalist library to promisify functions expecting node-style callbacks.
``bash`
npm install tiny-promisify
Given a fn that uses the node-style callbacks, expecting a callback as the last parameter and this callback expecting an err as the first parameter, you can obtain a new function that return promises as follows:
`javascript
var promisify = require('tiny-promisify');
function fn (args, callback) {
// fn code here...
callback(err, results);
}
var fnAsync = promisify(fn);
fnAsync(args).then(function (result) {
// your code here...
}).catch(function (err) {
// handle error here...
});
`
* fn is a function that receives a callback as the last. argument. The callback will receive an err object as the first argument.options
* is an optional object having the following properties:multiArgs
* set to true will make the promise resolve to an array containing all the parameters passed to the callback. Otherwise, only the first non-error parameter is passed to the promise success callback. Defaults to false.context
* is the object uses as this when calling fn. Defaults to {}.
Returns a new function that wraps fn in a promise.
The module uses Babel's polyfills for Promise and Object.assign() when not found in the current execution environment.
You can require the ES2015 version of the lib by specifying the source file: require('tiny-promisify/lib')`.
WTFPL