Node module for simple promisification
npm install sb-promisifyA node module to help you convert callback-style functions to promises
``js`
npm install --save sb-promisify
`js
function promisifyAll(object, throwError = true): Object
function promisify(callback, throwError = true): Function
export default promisify
export { promisify, promisifyAll }
`
`js
import fs from 'fs'
import promisify from 'sb-promisify'
const readFile = promisify(fs.readFile)
readFile('/etc/passwd', 'utf8').then(function(contents) {
console.log(contents)
}, function() {
console.error('Unable to read file')
})
`js
import fs from 'fs'
import { promisifyAll } from 'sb-promisify'
const promisedFS = promisifyAll(fs)
promisedFS.readFileAsync('/etc/passwd', 'utf8').then(function(contents) {
console.log(contents)
})
promisedFS.readFile('/etc/passwd', 'utf8', function(contents) {
console.log(contents)
})
`
If you set throwError to false, here's how it would react
`js
'use babel'
import fs from 'fs'
import promisify from 'sb-promisify'
const access = promisify(fs.access, false)
const readFile = promisify(fs.readFile, false)
readFile('/etc/passwd').then(function(contents) {
if (contents === false) {
console.error('Unable to read file')
} else {
console.log(contents.toString('utf8'))
}
})
access('/etc/passwd').then(function(access) {
console.log('access', access) // true or false
})
``