[Refactor] deprecated lib/core.js now uses is-core-module

lib/core.js

@@ -1,52 +1,12 @@
-var current = (process.versions && process.versions.node && process.versions.node.split('.')) || [];
-
-function specifierIncluded(specifier) {
-    var parts = specifier.split(' ');
-    var op = parts.length > 1 ? parts[0] : '=';
-    var versionParts = (parts.length > 1 ? parts[1] : parts[0]).split('.');
-
-    for (var i = 0; i < 3; ++i) {
-        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
-        }
-        if (op === '<') {
-            return cur < ver;
-        } else if (op === '>=') {
-            return cur >= ver;
-        }
-        return false;
-    }
-    return op === '>=';
-}
-
-function matchesRange(range) {
-    var specifiers = range.split(/ ?&& ?/);
-    if (specifiers.length === 0) { return false; }
-    for (var i = 0; i < specifiers.length; ++i) {
-        if (!specifierIncluded(specifiers[i])) { return false; }
-    }
-    return true;
-}
-
-function versionIncluded(specifierValue) {
-    if (typeof specifierValue === 'boolean') { return specifierValue; }
-    if (specifierValue && typeof specifierValue === 'object') {
-        for (var i = 0; i < specifierValue.length; ++i) {
-            if (matchesRange(specifierValue[i])) { return true; }
-        }
-        return false;
-    }
-    return matchesRange(specifierValue);
-}
+'use strict';
 
+var isCoreModule = require('is-core-module');
 var data = require('./core.json');
 
 var core = {};
 for (var mod in data) { // eslint-disable-line no-restricted-syntax
     if (Object.prototype.hasOwnProperty.call(data, mod)) {
-        core[mod] = versionIncluded(data[mod]);
+        core[mod] = isCoreModule(mod);
     }
 }
 module.exports = core;