helpers/mutability.js

'use strict'

var ok = require('objectkit')

module.exports = {
    setReadOnly: function(obj, key) {
        if (typeof obj[key] === 'array') {
            return obj[key].forEach(function(k) {
                setReadOnly(obj, k)
            })
        } else if (typeof obj[key] === 'object') {
            return Object.freeze(obj[key])
        } else if (typeof obj === 'object' && key === undefined) {
            return Object.freeze(obj)
        } else if (ok(obj).has(key)) {
            return Object.defineProperty(obj, key, {
                configurable: false,
                writable: false
            })
        } else {
            return obj
        }
    },
    setWritable: function(obj, key) {
        // Note that once Object.freeze is called on an object, it cannot be unfrozen
        if (typeof obj[key] === 'array') {
            return obj[key].forEach(function(k) {
                setWritable(obj, k)
            })
        } else if (ok(obj).has(key)) {
            return Object.defineProperty(obj, key, {
                configurable: true,
                writable: true
            })
        } else {
            return obj
        }
    }
}