function newGuid ( ) { return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx" . replace ( /[xy]/g , ( c ) => { const r = ( Math . random ( ) * 16 ) | 0 ; const v = c === "x" ? r : ( r & 0x3 ) | 0x8 ; return v . toString ( 16 ) ; } ) ; } export function GetUniqueString ( prefix = "" ) { return prefix + "_" + newGuid ( ) ; } export function BuildTestObject < T , K extends keyof T = keyof T > ( def , constructor ? ) { return Object . assign ( constructor === null ? { } : new constructor ( ) , def ) as T ; }