How to use the promisify function from es6-promisify

Find comprehensive JavaScript es6-promisify.promisify code examples handpicked from public code repositorys.

es6-promisify.promisify is a function that converts callback-style functions into Promise-based functions.

index.js

GitHub: princed/postcss-modules-values-replace

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async Once(root) {
  const resolver = ResolverFactory.createResolver({
    fileSystem,
    ...resolveOptions,
  });
  const resolve = promisify(resolver.resolve.bind(resolver));
  const readFile = promisify(fileSystem.readFile.bind(fileSystem));

  let preprocessPlugins = [];
  if (preprocessValues) {

+ 5 other calls in file

app.js

GitHub: abba-danmusa/Corporate-Affairs-Commission

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    next()
})


// promisify some callback based APIs
app.use((req, res, next) => {
    req.login = promisify(req.login, req)
    next()
})


const multerOptions = multer.diskStorage({

How does es6-promisify.promisify work?

es6-promisify.promisify is a function that takes a Node.js-style callback-based function and returns a new function that returns a promise. When the new function is called, it will call the original function and resolve or reject the promise based on whether the original function's callback was called with an error or a value.

index.js

GitHub: lovecircular/music-api

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const _resetTestQueryLog = () => (queryLog = []);
const ESCAPE_SYMBOL = Symbol("ESCAPED");


const initConnection = newConnection => {
  transactionStack = [];
  promisifiedQueryFunction = promisify(newConnection.query.bind(newConnection));
  promisifiedStartTransaction = promisify(
    newConnection.beginTransaction.bind(newConnection)
  );
  promisifedCommitTransaction = promisify(

+ 3 other calls in file

Ai Example

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const { promisify } = require("es6-promisify");
const fs = require("fs");

const readFileAsync = promisify(fs.readFile);

readFileAsync("example.txt", "utf8")
  .then((data) => console.log(data))
  .catch((err) => console.error(err));

In this example, promisify is used to create a promise-based version of the fs.readFile function, which traditionally takes a callback as its last argument. The resulting readFileAsync function can then be called with the same arguments as fs.readFile, but returns a promise that resolves with the file contents as a string.

Other functions in es6-promisify

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