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diff --git a/tools/node_modules/eslint/lib/rules/yield-star-spacing.js b/tools/node_modules/eslint/lib/rules/yield-star-spacing.js
new file mode 100644
index 0000000000..eb20fc01b0
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/yield-star-spacing.js
@@ -0,0 +1,117 @@
+/**
+ * @fileoverview Rule to check the spacing around the * in yield* expressions.
+ * @author Bryan Smith
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "require or disallow spacing around the `*` in `yield*` expressions",
+            category: "ECMAScript 6",
+            recommended: false
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        enum: ["before", "after", "both", "neither"]
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            before: { type: "boolean" },
+                            after: { type: "boolean" }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ]
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        const mode = (function(option) {
+            if (!option || typeof option === "string") {
+                return {
+                    before: { before: true, after: false },
+                    after: { before: false, after: true },
+                    both: { before: true, after: true },
+                    neither: { before: false, after: false }
+                }[option || "after"];
+            }
+            return option;
+        }(context.options[0]));
+
+        /**
+         * Checks the spacing between two tokens before or after the star token.
+         * @param {string} side Either "before" or "after".
+         * @param {Token} leftToken `function` keyword token if side is "before", or
+         *     star token if side is "after".
+         * @param {Token} rightToken Star token if side is "before", or identifier
+         *     token if side is "after".
+         * @returns {void}
+         */
+        function checkSpacing(side, leftToken, rightToken) {
+            if (sourceCode.isSpaceBetweenTokens(leftToken, rightToken) !== mode[side]) {
+                const after = leftToken.value === "*";
+                const spaceRequired = mode[side];
+                const node = after ? leftToken : rightToken;
+                const type = spaceRequired ? "Missing" : "Unexpected";
+                const message = "{{type}} space {{side}} *.";
+
+                context.report({
+                    node,
+                    message,
+                    data: {
+                        type,
+                        side
+                    },
+                    fix(fixer) {
+                        if (spaceRequired) {
+                            if (after) {
+                                return fixer.insertTextAfter(node, " ");
+                            }
+                            return fixer.insertTextBefore(node, " ");
+                        }
+                        return fixer.removeRange([leftToken.range[1], rightToken.range[0]]);
+                    }
+                });
+            }
+        }
+
+        /**
+         * Enforces the spacing around the star if node is a yield* expression.
+         * @param {ASTNode} node A yield expression node.
+         * @returns {void}
+         */
+        function checkExpression(node) {
+            if (!node.delegate) {
+                return;
+            }
+
+            const tokens = sourceCode.getFirstTokens(node, 3);
+            const yieldToken = tokens[0];
+            const starToken = tokens[1];
+            const nextToken = tokens[2];
+
+            checkSpacing("before", yieldToken, starToken);
+            checkSpacing("after", starToken, nextToken);
+        }
+
+        return {
+            YieldExpression: checkExpression
+        };
+
+    }
+};