path.format(pathObject)
Returns a path string from an object. This is the opposite of path.parse.
If pathObject has dir and base properties, the returned string will be a concatenation of the dir property, the platform-dependent path separator, and the base property.
If the dir property is not supplied, the root property will be used as the dir property. However, it will be assumed that the root property already ends with the platform-dependent path separator. In this case, the returned strin