Package Exports

es6-promisify

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (es6-promisify) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

es6-promisify

Converts callback-based functions to Promise-based functions.

Install

Install with npm

npm install --save es6-promisify

Example

"use strict";

// Declare variables
const promisify = require("es6-promisify");
const fs = require("fs");

// Convert the stat function
const stat = promisify(fs.stat);

// Now usable as a promise!
stat("example.txt").then(function (stats) {
    console.log("Got stats", stats);
}).catch(function (err) {
    console.error("Yikes!", err);
});

Promisify methods

"use strict";

// Declare variables
const promisify = require("es6-promisify");
const redis = require("redis").createClient(6379, "localhost");

// Create a promise-based version of send_command
const client = promisify(redis.send_command, redis);

// Send commands to redis and get a promise back
client("ping").then(function (pong) {
    console.log("Got", pong);
}).catch(function (err) {
    console.error("Unexpected error", err);
}).then(function () {
    redis.quit();
});

Handle callback multiple arguments

"use strict";

// Declare functions
function test(cb) {
    return cb(undefined, 1, 2, 3);
}

// Declare variables
const promisify = require("es6-promisify");

// Create promise-based version of test
const single = promisify(test);
const multi = promisify(test, {multiArgs: true});

// Discards additional arguments
single().then(function (result) {
    console.log(result); // 1
});

// Returns all arguments as an array
multi().then(function (result) {
    console.log(result); // [1, 2, 3]
});

Tests

Test with nodeunit

$ npm test

Published under the MIT License.