Deep Sort Javascript Object (ESNext)

sortObject.js

function sortObject(object) {
    // object is not defined (empty string, null, zero, undefined)
    if (!object) {
        return object
    }

    // object is an array
    if (object instanceof Array) {
        if (typeof object[0] === 'object') {
            return object.map(item => sortObject(item))
        }

        return object.sort((a,b) => String(a).localeCompare(String(b)))
    }

    // it is not an object
    if (typeof object !== 'object') {
        return object
    }

    const sortedObj = {}
    const keys = Object.keys(object).sort((key1, key2) => key1.localeCompare(key2))
    
    for (let index in keys) {
        const key = keys[index]
        console.log('next', object[key])
        sortedObj[key] = sortObject(object[key])
    }

    return sortedObj
}

// Thanks https://gist.github.com/ninapavlich/1697bcc107052f5b884a794d307845fe