nl_tokens: Write headers to the File object . Optional argument only is an array of regular expressions ; only headers matching one of these expressions are written .
pl_tokens: 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 ( ` ${ <mask> } ${ value } \n ` ) ; } }