1 files changed, 147 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-useless-rename.js b/tools/node_modules/eslint/lib/rules/no-useless-rename.js
new file mode 100644
index 0000000000..a489a6e51b
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/no-useless-rename.js
@@ -0,0 +1,147 @@
+/**
+ * @fileoverview Disallow renaming import, export, and destructured assignments to the same name.
+ * @author Kai Cataldo
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow renaming import, export, and destructured assignments to the same name",
+            category: "ECMAScript 6",
+            recommended: false
+        },
+        fixable: "code",
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    ignoreDestructuring: { type: "boolean" },
+                    ignoreImport: { type: "boolean" },
+                    ignoreExport: { type: "boolean" }
+                },
+                additionalProperties: false
+            }
+        ]
+    },
+
+    create(context) {
+        const options = context.options[0] || {},
+            ignoreDestructuring = options.ignoreDestructuring === true,
+            ignoreImport = options.ignoreImport === true,
+            ignoreExport = options.ignoreExport === true;
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Reports error for unnecessarily renamed assignments
+         * @param {ASTNode} node - node to report
+         * @param {ASTNode} initial - node with initial name value
+         * @param {ASTNode} result - node with new name value
+         * @param {string} type - the type of the offending node
+         * @returns {void}
+         */
+        function reportError(node, initial, result, type) {
+            const name = initial.type === "Identifier" ? initial.name : initial.value;
+
+            return context.report({
+                node,
+                message: "{{type}} {{name}} unnecessarily renamed.",
+                data: {
+                    name,
+                    type
+                },
+                fix(fixer) {
+                    return fixer.replaceTextRange([
+                        initial.range[0],
+                        result.range[1]
+                    ], name);
+                }
+            });
+        }
+
+        /**
+         * Checks whether a destructured assignment is unnecessarily renamed
+         * @param {ASTNode} node - node to check
+         * @returns {void}
+         */
+        function checkDestructured(node) {
+            if (ignoreDestructuring) {
+                return;
+            }
+
+            const properties = node.properties;
+
+            for (let i = 0; i < properties.length; i++) {
+                if (properties[i].shorthand) {
+                    continue;
+                }
+
+                /**
+                 * If an ObjectPattern property is computed, we have no idea
+                 * if a rename is useless or not. If an ObjectPattern property
+                 * lacks a key, it is likely an ExperimentalRestProperty and
+                 * so there is no "renaming" occurring here.
+                 */
+                if (properties[i].computed || !properties[i].key) {
+                    continue;
+                }
+
+                if (properties[i].key.type === "Identifier" && properties[i].key.name === properties[i].value.name ||
+                        properties[i].key.type === "Literal" && properties[i].key.value === properties[i].value.name) {
+                    reportError(properties[i], properties[i].key, properties[i].value, "Destructuring assignment");
+                }
+            }
+        }
+
+        /**
+         * Checks whether an import is unnecessarily renamed
+         * @param {ASTNode} node - node to check
+         * @returns {void}
+         */
+        function checkImport(node) {
+            if (ignoreImport) {
+                return;
+            }
+
+            if (node.imported.name === node.local.name &&
+                    node.imported.range[0] !== node.local.range[0]) {
+                reportError(node, node.imported, node.local, "Import");
+            }
+        }
+
+        /**
+         * Checks whether an export is unnecessarily renamed
+         * @param {ASTNode} node - node to check
+         * @returns {void}
+         */
+        function checkExport(node) {
+            if (ignoreExport) {
+                return;
+            }
+
+            if (node.local.name === node.exported.name &&
+                    node.local.range[0] !== node.exported.range[0]) {
+                reportError(node, node.local, node.exported, "Export");
+            }
+
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            ObjectPattern: checkDestructured,
+            ImportSpecifier: checkImport,
+            ExportSpecifier: checkExport
+        };
+    }
+};