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diff --git a/tools/node_modules/eslint/lib/rules/sort-keys.js b/tools/node_modules/eslint/lib/rules/sort-keys.js
new file mode 100644
index 0000000000..8821f62943
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+++ b/tools/node_modules/eslint/lib/rules/sort-keys.js
@@ -0,0 +1,157 @@
+/**
+ * @fileoverview Rule to require object keys to be sorted
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("../ast-utils"),
+    naturalCompare = require("natural-compare");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Gets the property name of the given `Property` node.
+ *
+ * - If the property's key is an `Identifier` node, this returns the key's name
+ *   whether it's a computed property or not.
+ * - If the property has a static name, this returns the static name.
+ * - Otherwise, this returns null.
+ *
+ * @param {ASTNode} node - The `Property` node to get.
+ * @returns {string|null} The property name or null.
+ * @private
+ */
+function getPropertyName(node) {
+    return astUtils.getStaticPropertyName(node) || node.key.name || null;
+}
+
+/**
+ * Functions which check that the given 2 names are in specific order.
+ *
+ * Postfix `I` is meant insensitive.
+ * Postfix `N` is meant natual.
+ *
+ * @private
+ */
+const isValidOrders = {
+    asc(a, b) {
+        return a <= b;
+    },
+    ascI(a, b) {
+        return a.toLowerCase() <= b.toLowerCase();
+    },
+    ascN(a, b) {
+        return naturalCompare(a, b) <= 0;
+    },
+    ascIN(a, b) {
+        return naturalCompare(a.toLowerCase(), b.toLowerCase()) <= 0;
+    },
+    desc(a, b) {
+        return isValidOrders.asc(b, a);
+    },
+    descI(a, b) {
+        return isValidOrders.ascI(b, a);
+    },
+    descN(a, b) {
+        return isValidOrders.ascN(b, a);
+    },
+    descIN(a, b) {
+        return isValidOrders.ascIN(b, a);
+    }
+};
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "require object keys to be sorted",
+            category: "Stylistic Issues",
+            recommended: false
+        },
+        schema: [
+            {
+                enum: ["asc", "desc"]
+            },
+            {
+                type: "object",
+                properties: {
+                    caseSensitive: {
+                        type: "boolean"
+                    },
+                    natural: {
+                        type: "boolean"
+                    }
+                },
+                additionalProperties: false
+            }
+        ]
+    },
+
+    create(context) {
+
+        // Parse options.
+        const order = context.options[0] || "asc";
+        const options = context.options[1];
+        const insensitive = (options && options.caseSensitive) === false;
+        const natual = Boolean(options && options.natural);
+        const isValidOrder = isValidOrders[
+            order + (insensitive ? "I" : "") + (natual ? "N" : "")
+        ];
+
+        // The stack to save the previous property's name for each object literals.
+        let stack = null;
+
+        return {
+            ObjectExpression() {
+                stack = {
+                    upper: stack,
+                    prevName: null
+                };
+            },
+
+            "ObjectExpression:exit"() {
+                stack = stack.upper;
+            },
+
+            Property(node) {
+                if (node.parent.type === "ObjectPattern") {
+                    return;
+                }
+
+                const prevName = stack.prevName;
+                const thisName = getPropertyName(node);
+
+                stack.prevName = thisName || prevName;
+
+                if (!prevName || !thisName) {
+                    return;
+                }
+
+                if (!isValidOrder(prevName, thisName)) {
+                    context.report({
+                        node,
+                        loc: node.key.loc,
+                        message: "Expected object keys to be in {{natual}}{{insensitive}}{{order}}ending order. '{{thisName}}' should be before '{{prevName}}'.",
+                        data: {
+                            thisName,
+                            prevName,
+                            order,
+                            insensitive: insensitive ? "insensitive " : "",
+                            natual: natual ? "natural " : ""
+                        }
+                    });
+                }
+            }
+        };
+    }
+};