modify (translate) {
      if (Glide.settings.focusAt >= 0) {
        const peek = Components.Peek.value

        if (isObject(peek)) {
          return translate - peek.before
        }

        return translate - peek
      }

      return translate
    }
Modifies passed translate value with a `peek` setting.

@param  {Number} translate
@return {Number}