first commit

app_vue/node_modules/eslint/lib/rules/no-compare-neg-zero.js

@@ -0,0 +1,60 @@
+/**
+ * @fileoverview The rule should warn against code that tries to compare against -0.
+ * @author Aladdin-ADD <hh_2013@foxmail.com>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "disallow comparing against -0",
+            category: "Possible Errors",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/no-compare-neg-zero"
+        },
+
+        fixable: null,
+        schema: [],
+
+        messages: {
+            unexpected: "Do not use the '{{operator}}' operator to compare against -0."
+        }
+    },
+
+    create(context) {
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Checks a given node is -0
+         * @param {ASTNode} node A node to check.
+         * @returns {boolean} `true` if the node is -0.
+         */
+        function isNegZero(node) {
+            return node.type === "UnaryExpression" && node.operator === "-" && node.argument.type === "Literal" && node.argument.value === 0;
+        }
+        const OPERATORS_TO_CHECK = new Set([">", ">=", "<", "<=", "==", "===", "!=", "!=="]);
+
+        return {
+            BinaryExpression(node) {
+                if (OPERATORS_TO_CHECK.has(node.operator)) {
+                    if (isNegZero(node.left) || isNegZero(node.right)) {
+                        context.report({
+                            node,
+                            messageId: "unexpected",
+                            data: { operator: node.operator }
+                        });
+                    }
+                }
+            }
+        };
+    }
+};