CustomEventclass CustomEvent<T = any> extends Event {constructor(typeArg: string, eventInitDict?: CustomEventInit<T>);readonly detail: T;}§Type Parameters§T = any[src]§Extends§Event[src]§Constructors§new CustomEvent(typeArg: string, eventInitDict?: CustomEventInit<T>)[src]§Properties§detail: T[src]Returns any custom data event was created with. Typically used for synthetic events.