Answers for "check condition and add item to object"

js conditional object property

const a = {
   ...(someCondition && {b: 5})
}

conditionally add key to object javascript

const condition = getCondition();
const additionalCondition = getAdditionalCondition();

const person = {
  firstName: "Max",
  ...(condition && { lastName: "" }),
  ...(additionalCondition && { addition: "" }),
};