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universalify

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universalify

Make a callback- or promise-based function support both promises and callbacks.

  • 0.1.0
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
91M
increased by3.23%
Maintainers
1
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Created

What is universalify?

The universalify npm package is designed to convert callback-based functions to ones that return promises, allowing for both callback and promise-based usage. This is particularly useful for supporting legacy code while taking advantage of the benefits of promises in newer code.

What are universalify's main functionalities?

fromCallback

Converts a function that uses a callback to one that returns a promise, but still supports the callback interface.

const universalify = require('universalify');
const fs = require('fs');
const readFileAsync = universalify.fromCallback(fs.readFile);

// Using as a promise
readFileAsync('example.txt', 'utf8').then(contents => {
  console.log(contents);
}).catch(error => {
  console.error('Error reading file:', error);
});

// Using with a callback
readFileAsync('example.txt', 'utf8', (error, contents) => {
  if (error) {
    console.error('Error reading file:', error);
    return;
  }
  console.log(contents);
});

fromPromise

Converts a promise-returning function to one that supports both promises and callbacks.

const universalify = require('universalify');
const fsPromises = require('fs').promises;
const readFile = universalify.fromPromise(fsPromises.readFile);

// Using as a promise
readFile('example.txt', 'utf8').then(contents => {
  console.log(contents);
}).catch(error => {
  console.error('Error reading file:', error);
});

// Using with a callback
readFile('example.txt', 'utf8', (error, contents) => {
  if (error) {
    console.error('Error reading file:', error);
    return;
  }
  console.log(contents);
});

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Package last updated on 22 Apr 2017

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