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5 Converts callback-based functions to Promise-based functions.
9 Install with [npm](https://npmjs.org/package/es6-promisify)
12 npm install --save es6-promisify
21 const promisify = require("es6-promisify");
22 const fs = require("fs");
24 // Convert the stat function
25 const stat = promisify(fs.stat);
27 // Now usable as a promise!
28 stat("example.txt").then(function (stats) {
29 console.log("Got stats", stats);
30 }).catch(function (err) {
31 console.error("Yikes!", err);
40 const promisify = require("es6-promisify");
41 const redis = require("redis").createClient(6379, "localhost");
43 // Create a promise-based version of send_command
44 const client = promisify(redis.send_command, redis);
46 // Send commands to redis and get a promise back
47 client("ping").then(function (pong) {
48 console.log("Got", pong);
49 }).catch(function (err) {
50 console.error("Unexpected error", err);
56 ## Handle callback multiple arguments
62 return cb(undefined, 1, 2, 3);
66 const promisify = require("es6-promisify");
68 // Create promise-based version of test
69 const single = promisify(test);
70 const multi = promisify(test, {multiArgs: true});
72 // Discards additional arguments
73 single().then(function (result) {
74 console.log(result); // 1
77 // Returns all arguments as an array
78 multi().then(function (result) {
79 console.log(result); // [1, 2, 3]
89 Published under the [MIT License](http://opensource.org/licenses/MIT).