deepExtend.js

deepExtend.js

function deepExtend(base, arg) {
    const baseType = typeof base
    const argType = typeof arg

    if (baseType !== argType || baseType !== 'object' || arg instanceof Array) {
        return arg
    }

    return Object.fromEntries([
        ...Object.entries(base),
        ...Object.entries(arg).map(([key, value]) => {
            return [
                key,
                deepExtend(base[key], value),
            ]
        }),
    ])
}