required-pm

ensures all required parameters are not null, or throws a useful error like "phone is required"

Purpose

When I am creating a sign-up form for users, I typically ask for First Name, Last Name, email, phone, address. Some of these fields are required and we would not allow the sign up to proceed until they are filled in. required-pm simplifies the error checking process and returns meaningful messages when a required field is not filled in.

Usage

const required = require('required-pm').throw

function signUp(firstName, lastName, phone, email, address) {
    // firstName, lastName and email are required fields
    required({firstName, lastName, email})
    // ..... the rest of code
}

Just one line of code, and required-pm would check all these fields to ensure they are not null or undefined, and throws meaningful error like firstName is required if a field is null.

Customizable

An optional parameter can be used to customize what require-pm checks for.

E.g. checks for undefined only

required({firstName, lastName, email}, 'u')

checks for undefined, null and ''

required({firstName, lastName, email}, 'snu')

checks for undefined, null, '', false and 0

required({firstName, lastName, email}, 'snzfu')     // I was shooting for snafu :)

Modes

Instead of throwing errors, required-pm can return the list of empty fields instead

const required = require('required-pm').list

function signUp(firstName, lastName, phone, email, address) {
    required({firstName, lastName, email})  //=> returns the list of empty fields instead of throwing an error
    // ..... the rest of code
}

More Documentation

Click here for more detailed documentation.