Just an example function:

// Merges objects | arrays
function merge(...values) {
  return Object.assign(
    {},
    ...values.map((value) =>
      Array.isArray(value)
        ? Object.fromEntries(value.map((val) => [val, null]))
        : value,
    ),
  )
}

merge({k1: 1}, {k2: 2}) // {k1: 1, k2: 2} -