immutify.js

const immutify = (obj) => {
    const obj = Object.keys(obj).reduce((acc, key) => {
        Object.defineProperty(acc, key, { value: obj[key], writable: false, enumerable: true})
        return acc
    }, {})
    const hash = hashObj(obj)
    Object.defineProperty(obj, 'hash', { value: hash, writable: false, enumerable: false})
    Object.preventExtensions(obj)
    return obj
}


const deimmutify = (obj) =>
    Object.keys(obj).reduce((acc, key) => {
        acc[key] = obj[key]
        return acc
    }, {})