[New] add new core modules that will be in node v15

 - `dns/promises`: nodejs/node#32953
 - `assert/strict`: nodejs/node#34001
 - `stream/promises`: nodejs/node#33991
 - `timers/promises`: nodejs/node#33950

Author: ljharb

lib/core.js

@@ -6,8 +6,8 @@ function specifierIncluded(specifier) {
     var versionParts = (parts.length > 1 ? parts[1] : parts[0]).split('.');
 
     for (var i = 0; i < 3; ++i) {
-        var cur = Number(current[i] || 0);
-        var ver = Number(versionParts[i] || 0);
+        var cur = parseInt(current[i] || 0, 10);
+        var ver = parseInt(versionParts[i] || 0, 10);
         if (cur === ver) {
             continue; // eslint-disable-line no-restricted-syntax, no-continue
         }

lib/core.json

@@ -1,5 +1,6 @@
 {
     "assert": true,
+    "assert/strict": ">= 15",
     "async_hooks": ">= 8",
     "buffer_ieee754": "< 0.9.7",
     "buffer": true,
@@ -12,6 +13,7 @@
     "_debugger": "< 8",
     "dgram": true,
     "dns": true,
+    "dns/promises": ">= 15",
     "domain": true,
     "events": true,
     "freelist": "< 6",
@@ -49,9 +51,11 @@
     "_stream_readable": ">= 0.9.4",
     "_stream_writable": ">= 0.9.4",
     "stream": true,
+    "stream/promises": ">= 15",
     "string_decoder": true,
     "sys": true,
     "timers": true,
+    "timers/promises": ">= 15",
     "_tls_common": ">= 0.11.13",
     "_tls_legacy": ">= 0.11.3 && < 10",
     "_tls_wrap": ">= 0.11.3",

test/core.js

@@ -22,16 +22,12 @@ test('core modules', function (t) {
 
         for (var i = 0; i < cores.length; ++i) {
             var mod = cores[i];
+            var requireFunc = function () { require(mod); }; // eslint-disable-line no-loop-func
+            console.log(mod, resolve.core, resolve.core[mod]);
             if (resolve.core[mod]) {
-                st.doesNotThrow(
-                    function () { require(mod); }, // eslint-disable-line no-loop-func
-                    mod + ' supported; requiring does not throw'
-                );
+                st.doesNotThrow(requireFunc, mod + ' supported; requiring does not throw');
             } else {
-                st.throws(
-                    function () { require(mod); }, // eslint-disable-line no-loop-func
-                    mod + ' not supported; requiring throws'
-                );
+                st.throws(requireFunc, mod + ' not supported; requiring throws');
             }
         }