Get in memory size of a JavaScript value/object

sizeOf.js

const typeSizes = {
    'boolean': () => 4,
    'number': () => 8,
    'string': (item) => 2 * item.length,
    'object': (item) => Object.keys(item).reduce(
    	(sum, key) => sum + sizeOf(key) + sizeOf(item[key]), 0
    )
};

export default const sizeOf = (value) => typeSizes[typeof value](value);