First support for md extensions; Package all needed dependencies in the repo

Source/node_modules/resolve/test/core.js

@@ -0,0 +1,88 @@
+var test = require('tape');
+var keys = require('object-keys');
+var semver = require('semver');
+
+var resolve = require('../');
+
+var brokenNode = semver.satisfies(process.version, '11.11 - 11.13');
+
+test('core modules', function (t) {
+    t.test('isCore()', function (st) {
+        st.ok(resolve.isCore('fs'));
+        st.ok(resolve.isCore('net'));
+        st.ok(resolve.isCore('http'));
+
+        st.ok(!resolve.isCore('seq'));
+        st.ok(!resolve.isCore('../'));
+
+        st.ok(!resolve.isCore('toString'));
+
+        st.end();
+    });
+
+    t.test('core list', function (st) {
+        var cores = keys(resolve.core);
+        st.plan(cores.length);
+
+        for (var i = 0; i < cores.length; ++i) {
+            var mod = cores[i];
+            // note: this must be require, not require.resolve, due to https://github.com/nodejs/node/issues/43274
+            var requireFunc = function () { require(mod); }; // eslint-disable-line no-loop-func
+            t.comment(mod + ': ' + resolve.core[mod]);
+            if (resolve.core[mod]) {
+                st.doesNotThrow(requireFunc, mod + ' supported; requiring does not throw');
+            } else if (brokenNode) {
+                st.ok(true, 'this version of node is broken: attempting to require things that fail to resolve breaks "home_paths" tests');
+            } else {
+                st.throws(requireFunc, mod + ' not supported; requiring throws');
+            }
+        }
+
+        st.end();
+    });
+
+    t.test('core via repl module', { skip: !resolve.core.repl }, function (st) {
+        var libs = require('repl')._builtinLibs; // eslint-disable-line no-underscore-dangle
+        if (!libs) {
+            st.skip('module.builtinModules does not exist');
+            return st.end();
+        }
+        for (var i = 0; i < libs.length; ++i) {
+            var mod = libs[i];
+            st.ok(resolve.core[mod], mod + ' is a core module');
+            st.doesNotThrow(
+                function () { require(mod); }, // eslint-disable-line no-loop-func
+                'requiring ' + mod + ' does not throw'
+            );
+        }
+        st.end();
+    });
+
+    t.test('core via builtinModules list', { skip: !resolve.core.module }, function (st) {
+        var libs = require('module').builtinModules;
+        if (!libs) {
+            st.skip('module.builtinModules does not exist');
+            return st.end();
+        }
+        var blacklist = [
+            '_debug_agent',
+            'v8/tools/tickprocessor-driver',
+            'v8/tools/SourceMap',
+            'v8/tools/tickprocessor',
+            'v8/tools/profile'
+        ];
+        for (var i = 0; i < libs.length; ++i) {
+            var mod = libs[i];
+            if (blacklist.indexOf(mod) === -1) {
+                st.ok(resolve.core[mod], mod + ' is a core module');
+                st.doesNotThrow(
+                    function () { require(mod); }, // eslint-disable-line no-loop-func
+                    'requiring ' + mod + ' does not throw'
+                );
+            }
+        }
+        st.end();
+    });
+
+    t.end();
+});