[express-serve-static-core] Small improvements (#39025)
[express-serve-static-core] Small improvements (#39025)


georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,mcliment/DefinitelyTyped,dsebastien/DefinitelyTyped,markogresak/DefinitelyTyped