Fix: eqeqeq rule reports incorrect locations (#12265)

Author: mdjermanovic

lib/rules/eqeqeq.js

@@ -116,18 +116,6 @@ module.exports = {
             return astUtils.isNullLiteral(node.right) || astUtils.isNullLiteral(node.left);
         }
 
-        /**
-         * Gets the location (line and column) of the binary expression's operator
-         * @param {ASTNode} node The binary expression node to check
-         * @returns {Object} { line, column } location of operator
-         * @private
-         */
-        function getOperatorLocation(node) {
-            const opToken = sourceCode.getTokenAfter(node.left);
-
-            return { line: opToken.loc.start.line, column: opToken.loc.start.column };
-        }
-
         /**
          * Reports a message for this rule.
          * @param {ASTNode} node The binary expression node that was checked
@@ -136,21 +124,21 @@ module.exports = {
          * @private
          */
         function report(node, expectedOperator) {
+            const operatorToken = sourceCode.getFirstTokenBetween(
+                node.left,
+                node.right,
+                token => token.value === node.operator
+            );
+
             context.report({
                 node,
-                loc: getOperatorLocation(node),
+                loc: operatorToken.loc,
                 messageId: "unexpected",
                 data: { expectedOperator, actualOperator: node.operator },
                 fix(fixer) {
 
                     // If the comparison is a `typeof` comparison or both sides are literals with the same type, then it's safe to fix.
                     if (isTypeOfBinary(node) || areLiteralsAndSameType(node)) {
-                        const operatorToken = sourceCode.getFirstTokenBetween(
-                            node.left,
-                            node.right,
-                            token => token.value === node.operator
-                        );
-
                         return fixer.replaceText(operatorToken, expectedOperator);
                     }
                     return null;

tests/lib/cli-engine/cli-engine.js

@@ -1641,6 +1641,8 @@ describe("CLIEngine", () => {
                             {
                                 column: 9,
                                 line: 2,
+                                endColumn: 11,
+                                endLine: 2,
                                 message: "Expected '===' and instead saw '=='.",
                                 messageId: "unexpected",
                                 nodeType: "BinaryExpression",

tests/lib/rules/eqeqeq.js

@@ -105,6 +105,69 @@ ruleTester.run("eqeqeq", rule, {
                 { messageId: "unexpected", data: wantedNotEqEq, type: "BinaryExpression", line: 1 },
                 { messageId: "unexpected", data: wantedNotEqEq, type: "BinaryExpression", line: 1 }
             ]
+        },
+
+        // location tests
+        {
+            code: "a == b;",
+            errors: [
+                {
+                    messageId: "unexpected",
+                    data: wantedEqEqEq,
+                    type: "BinaryExpression",
+                    column: 3,
+                    endColumn: 5
+                }
+            ]
+        },
+        {
+            code: "a!=b;",
+            errors: [
+                {
+                    messageId: "unexpected",
+                    data: wantedNotEqEq,
+                    type: "BinaryExpression",
+                    column: 2,
+                    endColumn: 4
+                }
+            ]
+        },
+        {
+            code: "(a + b) == c;",
+            errors: [
+                {
+                    messageId: "unexpected",
+                    data: wantedEqEqEq,
+                    type: "BinaryExpression",
+                    column: 9,
+                    endColumn: 11
+                }
+            ]
+        },
+        {
+            code: "(a + b)  !=  c;",
+            errors: [
+                {
+                    messageId: "unexpected",
+                    data: wantedNotEqEq,
+                    type: "BinaryExpression",
+                    column: 10,
+                    endColumn: 12
+                }
+            ]
+        },
+        {
+            code: "((1) )  ==  (2);",
+            output: "((1) )  ===  (2);",
+            errors: [
+                {
+                    messageId: "unexpected",
+                    data: wantedEqEqEq,
+                    type: "BinaryExpression",
+                    column: 9,
+                    endColumn: 11
+                }
+            ]
         }
 
     // If no output is provided, assert that no output is produced.