1 files changed, 69 insertions, 0 deletions
diff --git a/node_modules/is-core-module/index.js b/node_modules/is-core-module/index.js
new file mode 100644
index 0000000..f9637e0
--- /dev/null
+++ b/node_modules/is-core-module/index.js
@@ -0,0 +1,69 @@
+'use strict';
+
+var has = require('has');
+
+function specifierIncluded(current, specifier) {
+	var nodeParts = current.split('.');
+	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(nodeParts[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;
+		}
+		if (op === '>=') {
+			return cur >= ver;
+		}
+		return false;
+	}
+	return op === '>=';
+}
+
+function matchesRange(current, range) {
+	var specifiers = range.split(/ ?&& ?/);
+	if (specifiers.length === 0) {
+		return false;
+	}
+	for (var i = 0; i < specifiers.length; ++i) {
+		if (!specifierIncluded(current, specifiers[i])) {
+			return false;
+		}
+	}
+	return true;
+}
+
+function versionIncluded(nodeVersion, specifierValue) {
+	if (typeof specifierValue === 'boolean') {
+		return specifierValue;
+	}
+
+	var current = typeof nodeVersion === 'undefined'
+		? process.versions && process.versions.node
+		: nodeVersion;
+
+	if (typeof current !== 'string') {
+		throw new TypeError(typeof nodeVersion === 'undefined' ? 'Unable to determine current node version' : 'If provided, a valid node version is required');
+	}
+
+	if (specifierValue && typeof specifierValue === 'object') {
+		for (var i = 0; i < specifierValue.length; ++i) {
+			if (matchesRange(current, specifierValue[i])) {
+				return true;
+			}
+		}
+		return false;
+	}
+	return matchesRange(current, specifierValue);
+}
+
+var data = require('./core.json');
+
+module.exports = function isCore(x, nodeVersion) {
+	return has(data, x) && versionIncluded(nodeVersion, data[x]);
+};