encode ParsedUrlQuery to a query string (I later realised an encode func already exists) (I then later realised I didn't need this at all)

buildQueryString.ts

import { ParsedUrlQuery } from 'querystring';
import { isArray } from 'lodash';

// allows params with no val
const buildQueryStringFromParams = (params: ParsedUrlQuery = {}): string =>
  Object.keys(params)
    .map((p, i) => {
      const separator = i ? '&' : '?';
      const value = params[p] || '';

      return isArray(value)
        ? value
            .map(v => `${separator}${p}` + (v !== '' ? `=${encodeURIComponent(v)}` : ``))
            .join('')
        : `${separator}${p}` + (value !== '' ? `=${encodeURIComponent(value)}` : ``);
    })
    .join('');