Migrate from legacy querystring to URLSearchParams

[Joneser]

#117

The querystring lib is now deprecated and as a result no longer has active support.

Replacing its usage with the URLSearchParams which still receives active support.

[oporkka]

👍

[shuhei]

Looks like new URLSearchParams(obj) doesn't support string[] as a param value. https://nodejs.org/api/url.html#new-urlsearchparamsobj

Unlike querystring module, duplicate keys in the form of array values are not allowed. Arrays are stringified using array.toString(), which simply joins all array elements with commas.

So, this is going to be a breaking change?

[ponimas]

So, this is going to be a breaking change?

I would better mimic the old behavior, but it requires transformation into the array of arrays.

new URLSearchParams([["a", 1], ["a", 2]]).toString()
'a=1&a=2'