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const isDisjoint = (...headers: Array<object | undefined>) => {  const sources = <object[]>headers.filter(Boolean)
  if (sources.length === 0 || sources.length === 1) {    return true  }
  let acc!: Set<string>  for (const header of sources) {    const parameters = Object.keys(header)    if (!acc || acc.size === 0) {      acc = new Set(parameters)      continue    }
    for (const parameter of parameters) {      if (acc.has(parameter)) {        return false      }      acc.add(parameter)    }  }
  return true}export default isDisjoint