1 files changed, 75 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-useless-computed-key.js b/tools/node_modules/eslint/lib/rules/no-useless-computed-key.js
new file mode 100644
index 0000000000..f8114ab754
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+++ b/tools/node_modules/eslint/lib/rules/no-useless-computed-key.js
@@ -0,0 +1,75 @@
+/**
+ * @fileoverview Rule to disallow unnecessary computed property keys in object literals
+ * @author Burak Yigit Kaya
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("../ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+const MESSAGE_UNNECESSARY_COMPUTED = "Unnecessarily computed property [{{property}}] found.";
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow unnecessary computed property keys in object literals",
+            category: "ECMAScript 6",
+            recommended: false
+        },
+
+        schema: [],
+
+        fixable: "code"
+    },
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        return {
+            Property(node) {
+                if (!node.computed) {
+                    return;
+                }
+
+                const key = node.key,
+                    nodeType = typeof key.value;
+
+                if (key.type === "Literal" && (nodeType === "string" || nodeType === "number") && key.value !== "__proto__") {
+                    context.report({
+                        node,
+                        message: MESSAGE_UNNECESSARY_COMPUTED,
+                        data: { property: sourceCode.getText(key) },
+                        fix(fixer) {
+                            const leftSquareBracket = sourceCode.getFirstToken(node, astUtils.isOpeningBracketToken);
+                            const rightSquareBracket = sourceCode.getFirstTokenBetween(node.key, node.value, astUtils.isClosingBracketToken);
+                            const tokensBetween = sourceCode.getTokensBetween(leftSquareBracket, rightSquareBracket, 1);
+
+                            if (tokensBetween.slice(0, -1).some((token, index) =>
+                                sourceCode.getText().slice(token.range[1], tokensBetween[index + 1].range[0]).trim())) {
+
+                                // If there are comments between the brackets and the property name, don't do a fix.
+                                return null;
+                            }
+
+                            const tokenBeforeLeftBracket = sourceCode.getTokenBefore(leftSquareBracket);
+
+                            // Insert a space before the key to avoid changing identifiers, e.g. ({ get[2]() {} }) to ({ get2() {} })
+                            const needsSpaceBeforeKey = tokenBeforeLeftBracket.range[1] === leftSquareBracket.range[0] &&
+                                !astUtils.canTokensBeAdjacent(tokenBeforeLeftBracket, sourceCode.getFirstToken(key));
+
+                            const replacementKey = (needsSpaceBeforeKey ? " " : "") + key.raw;
+
+                            return fixer.replaceTextRange([leftSquareBracket.range[0], rightSquareBracket.range[1]], replacementKey);
+                        }
+                    });
+                }
+            }
+        };
+    }
+};