JavaScript Join Sist of Objects с списками

// map results in any[][] which is destructured and concatenated
// object: {someBoolean: boolean, objectWithLists: {id: string, list:any[]}[]}
[].concat(...object.listOfObjectsWithListAndId.map(
                            (obj: {id: string, list: any[]}) => obj.list,
                          ),
                        )
Scary Swan