Promise / async/await support #200
Description
Hi,
Thanks for this library!
I use koa@2 that supports async/await syntax. My use case is:
const forms = require('forms')
let myForm = forms.create({
username: fields.string({ required: true })
})
// POST request handler
app.use(async function(ctx) {
let boundedForm = myForm.bind(ctx.request.body)
let errors = await boundedForm.validate() // <-- I need syntax like this
if (errors) {
ctx.render('index', {
form: boundedForm.toHTML()
})
} else {
ctx.body = 'form is valid'
}
})What do you think about support of promises (promisification)?
Currently, I forced to use my wrapper around this library. It promisifies validate function:
const forms = require('forms')
let {create} = forms
forms.create = function (fields, options) {
let form = create(fields, options)
let {bind} = form
form.bind = function (data) {
let boundedForm = bind(data)
// @see https://github.com/caolan/forms/blob/v1.3.0/lib/forms.js#L45
let {validate} = boundedForm
boundedForm.validate = function () {
let deferred = new Deferred()
validate(deferred.resolve)
return deferred.promise
}
return boundedForm
}
return form
}
class Deferred {
constructor() {
this.promise = new Promise(this.onPromise.bind(this))
}
onPromise(resolve, reject) {
this.resolve = resolve
this.reject = reject
}
resolve() {}
reject() {}
}
module.exports = forms