dns: export error code constants from dns/promises

doc/api/dns.md

@@ -1399,6 +1399,8 @@ Each DNS query can return one of the following error codes:
 * `dns.ADDRGETNETWORKPARAMS`: Could not find `GetNetworkParams` function.
 * `dns.CANCELLED`: DNS query cancelled.
 
+The above error codes are also exported by the `dnsPromises` API, e.g., `dnsPromises.NODATA`.
+
 ## Implementation considerations
 
 Although [`dns.lookup()`][] and the various `dns.resolve*()/dns.reverse()`

lib/dns.js

@@ -44,7 +44,34 @@ const {
   emitInvalidHostnameWarning,
   getDefaultVerbatim,
   setDefaultResultOrder,
+  errorCodes: dnsErrorCodes,
 } = require('internal/dns/utils');
+const {
+  NODATA,
+  FORMERR,
+  SERVFAIL,
+  NOTFOUND,
+  NOTIMP,
+  REFUSED,
+  BADQUERY,
+  BADNAME,
+  BADFAMILY,
+  BADRESP,
+  CONNREFUSED,
+  TIMEOUT,
+  EOF,
+  FILE,
+  NOMEM,
+  DESTRUCTION,
+  BADSTR,
+  BADFLAGS,
+  NONAME,
+  BADHINTS,
+  NOTINITIALIZED,
+  LOADIPHLPAPI,
+  ADDRGETNETWORKPARAMS,
+  CANCELLED,
+} = dnsErrorCodes;
 const {
   ERR_INVALID_ARG_TYPE,
   ERR_INVALID_ARG_VALUE,
@@ -351,30 +378,30 @@ module.exports = {
   V4MAPPED: cares.AI_V4MAPPED,
 
   // ERROR CODES
-  NODATA: 'ENODATA',
-  FORMERR: 'EFORMERR',
-  SERVFAIL: 'ESERVFAIL',
-  NOTFOUND: 'ENOTFOUND',
-  NOTIMP: 'ENOTIMP',
-  REFUSED: 'EREFUSED',
-  BADQUERY: 'EBADQUERY',
-  BADNAME: 'EBADNAME',
-  BADFAMILY: 'EBADFAMILY',
-  BADRESP: 'EBADRESP',
-  CONNREFUSED: 'ECONNREFUSED',
-  TIMEOUT: 'ETIMEOUT',
-  EOF: 'EOF',
-  FILE: 'EFILE',
-  NOMEM: 'ENOMEM',
-  DESTRUCTION: 'EDESTRUCTION',
-  BADSTR: 'EBADSTR',
-  BADFLAGS: 'EBADFLAGS',
-  NONAME: 'ENONAME',
-  BADHINTS: 'EBADHINTS',
-  NOTINITIALIZED: 'ENOTINITIALIZED',
-  LOADIPHLPAPI: 'ELOADIPHLPAPI',
-  ADDRGETNETWORKPARAMS: 'EADDRGETNETWORKPARAMS',
-  CANCELLED: 'ECANCELLED'
+  NODATA,
+  FORMERR,
+  SERVFAIL,
+  NOTFOUND,
+  NOTIMP,
+  REFUSED,
+  BADQUERY,
+  BADNAME,
+  BADFAMILY,
+  BADRESP,
+  CONNREFUSED,
+  TIMEOUT,
+  EOF,
+  FILE,
+  NOMEM,
+  DESTRUCTION,
+  BADSTR,
+  BADFLAGS,
+  NONAME,
+  BADHINTS,
+  NOTINITIALIZED,
+  LOADIPHLPAPI,
+  ADDRGETNETWORKPARAMS,
+  CANCELLED,
 };
 
 bindDefaultResolver(module.exports, getDefaultResolver());

lib/internal/dns/promises.js

@@ -16,7 +16,34 @@ const {
   validateTries,
   emitInvalidHostnameWarning,
   getDefaultVerbatim,
+  errorCodes: dnsErrorCodes,
 } = require('internal/dns/utils');
+const {
+  NODATA,
+  FORMERR,
+  SERVFAIL,
+  NOTFOUND,
+  NOTIMP,
+  REFUSED,
+  BADQUERY,
+  BADNAME,
+  BADFAMILY,
+  BADRESP,
+  CONNREFUSED,
+  TIMEOUT,
+  EOF,
+  FILE,
+  NOMEM,
+  DESTRUCTION,
+  BADSTR,
+  BADFLAGS,
+  NONAME,
+  BADHINTS,
+  NOTINITIALIZED,
+  LOADIPHLPAPI,
+  ADDRGETNETWORKPARAMS,
+  CANCELLED,
+} = dnsErrorCodes;
 const { codes, dnsException } = require('internal/errors');
 const { toASCII } = require('internal/idna');
 const { isIP } = require('internal/net');
@@ -313,5 +340,35 @@ Resolver.prototype.resolve = function resolve(hostname, rrtype) {
 };
 
 
-module.exports = { lookup, lookupService, Resolver };
+module.exports = {
+  lookup,
+  lookupService,
+  Resolver,
+
+  // ERROR CODES
+  NODATA,
+  FORMERR,
+  SERVFAIL,
+  NOTFOUND,
+  NOTIMP,
+  REFUSED,
+  BADQUERY,
+  BADNAME,
+  BADFAMILY,
+  BADRESP,
+  CONNREFUSED,
+  TIMEOUT,
+  EOF,
+  FILE,
+  NOMEM,
+  DESTRUCTION,
+  BADSTR,
+  BADFLAGS,
+  NONAME,
+  BADHINTS,
+  NOTINITIALIZED,
+  LOADIPHLPAPI,
+  ADDRGETNETWORKPARAMS,
+  CANCELLED,
+};
 bindDefaultResolver(module.exports, Resolver.prototype);

lib/internal/dns/utils.js

@@ -201,6 +201,34 @@ function setDefaultResultOrder(value) {
   dnsOrder = value;
 }
 
+// ERROR CODES
+const errorCodes = {
+  NODATA: 'ENODATA',
+  FORMERR: 'EFORMERR',
+  SERVFAIL: 'ESERVFAIL',
+  NOTFOUND: 'ENOTFOUND',
+  NOTIMP: 'ENOTIMP',
+  REFUSED: 'EREFUSED',
+  BADQUERY: 'EBADQUERY',
+  BADNAME: 'EBADNAME',
+  BADFAMILY: 'EBADFAMILY',
+  BADRESP: 'EBADRESP',
+  CONNREFUSED: 'ECONNREFUSED',
+  TIMEOUT: 'ETIMEOUT',
+  EOF: 'EOF',
+  FILE: 'EFILE',
+  NOMEM: 'ENOMEM',
+  DESTRUCTION: 'EDESTRUCTION',
+  BADSTR: 'EBADSTR',
+  BADFLAGS: 'EBADFLAGS',
+  NONAME: 'ENONAME',
+  BADHINTS: 'EBADHINTS',
+  NOTINITIALIZED: 'ENOTINITIALIZED',
+  LOADIPHLPAPI: 'ELOADIPHLPAPI',
+  ADDRGETNETWORKPARAMS: 'EADDRGETNETWORKPARAMS',
+  CANCELLED: 'ECANCELLED',
+};
+
 module.exports = {
   bindDefaultResolver,
   getDefaultResolver,
@@ -212,4 +240,5 @@ module.exports = {
   emitInvalidHostnameWarning,
   getDefaultVerbatim,
   setDefaultResultOrder,
+  errorCodes,
 };

test/parallel/test-dns-promises-exists.js

@@ -2,5 +2,32 @@
 
 require('../common');
 const assert = require('assert');
+const dnsPromises = require('dns/promises');
+const dns = require('dns');
 
-assert.strictEqual(require('dns/promises'), require('dns').promises);
+assert.strictEqual(dnsPromises, dns.promises);
+
+assert.strictEqual(dnsPromises.NODATA, dns.NODATA);
+assert.strictEqual(dnsPromises.FORMERR, dns.FORMERR);
+assert.strictEqual(dnsPromises.SERVFAIL, dns.SERVFAIL);
+assert.strictEqual(dnsPromises.NOTFOUND, dns.NOTFOUND);
+assert.strictEqual(dnsPromises.NOTIMP, dns.NOTIMP);
+assert.strictEqual(dnsPromises.REFUSED, dns.REFUSED);
+assert.strictEqual(dnsPromises.BADQUERY, dns.BADQUERY);
+assert.strictEqual(dnsPromises.BADNAME, dns.BADNAME);
+assert.strictEqual(dnsPromises.BADFAMILY, dns.BADFAMILY);
+assert.strictEqual(dnsPromises.BADRESP, dns.BADRESP);
+assert.strictEqual(dnsPromises.CONNREFUSED, dns.CONNREFUSED);
+assert.strictEqual(dnsPromises.TIMEOUT, dns.TIMEOUT);
+assert.strictEqual(dnsPromises.EOF, dns.EOF);
+assert.strictEqual(dnsPromises.FILE, dns.FILE);
+assert.strictEqual(dnsPromises.NOMEM, dns.NOMEM);
+assert.strictEqual(dnsPromises.DESTRUCTION, dns.DESTRUCTION);
+assert.strictEqual(dnsPromises.BADSTR, dns.BADSTR);
+assert.strictEqual(dnsPromises.BADFLAGS, dns.BADFLAGS);
+assert.strictEqual(dnsPromises.NONAME, dns.NONAME);
+assert.strictEqual(dnsPromises.BADHINTS, dns.BADHINTS);
+assert.strictEqual(dnsPromises.NOTINITIALIZED, dns.NOTINITIALIZED);
+assert.strictEqual(dnsPromises.LOADIPHLPAPI, dns.LOADIPHLPAPI);
+assert.strictEqual(dnsPromises.ADDRGETNETWORKPARAMS, dns.ADDRGETNETWORKPARAMS);
+assert.strictEqual(dnsPromises.CANCELLED, dns.CANCELLED);