function writeHeaders(file, headers, only = null) {
  for (let name in headers) {
    let value = headers[name];
    if (only && !match(name, only))
      continue;
    if (Array.isArray(value))
      for (let item of value)
        file.write(`${name}: ${item}\n`);
    else
      file.write(`${name}: ${value}\n`);
  }
}
function writeHeaders(file, headers, only = null) {
  for (let name in headers) {
    let value = headers[name];
    if (only && !match(name, only))
      continue;
    if (Array.isArray(value))
      for (let item of value)
        file.write(`${name}: ${item}\n`);
    else
      file.write(`${name}: ${value}\n`);
  }
}
function writeHeaders ( file , headers , only = null ) { for ( let name in headers ) { let value = headers [ name ] ; if ( only && ! match ( name , only ) ) continue ; if ( Array . isArray ( value ) ) for ( let item of value ) file . write ( ` ${ name } ${ item } \n ` ) ; else file . write ( ` ${ name } ${ value } \n ` ) ; } }
Write headers to the File object.  Optional argument `only` is an array of regular expressions; only headers matching one of these expressions are written.
Write headers to the File object . Optional argument only is an array of regular expressions ; only headers matching one of these expressions are written .