uncertain-boolean 
Flow control for indeterminate booleans as POJO
Your API returns booleans, but sometimes a value is unknown. You want to have uncertain or null or true, but as plain javascript.
Install
$ npm install --save uncertain-boolean
Usage
var Uncertain = require('uncertain-boolean')
var value = Uncertain() // => 'uncertain'
Uncertain.is(value) // => true
Uncertain.is(true) // => false
Uncertain.is(false) // => false
Uncertain.cast(true) // => true
Uncertain.cast('true') // => true
Uncertain.cast(false) // => false
Uncertain.cast('false') // => true
Uncertain.cast(0) // => false
Uncertain.cast(1) // => true
Uncertain.cast(null) // => 'uncertain'
Uncertain.cast(undefined) // => 'uncertain'License
MIT © Andrew Joslin